U.S. patent application number 15/672438 was filed with the patent office on 2017-11-23 for systems and methods for concealed radar imaging.
This patent application is currently assigned to Elwha LLC. The applicant listed for this patent is Elwha LLC. Invention is credited to Tom Driscoll, Roderick A. Hyde, Jordin T. Kare, David R. Smith, Clarence T. Tegreene, Lowell L. Wood,, JR..
Application Number | 20170336505 15/672438 |
Document ID | / |
Family ID | 53399771 |
Filed Date | 2017-11-23 |
United States Patent
Application |
20170336505 |
Kind Code |
A1 |
Driscoll; Tom ; et
al. |
November 23, 2017 |
SYSTEMS AND METHODS FOR CONCEALED RADAR IMAGING
Abstract
A concealed radar imaging system includes a visible light
mirror, a radar device positioned behind the visible light mirror,
and a processing circuit coupled to the radar device. The visible
light mirror includes a reflective layer configured to reflect
visible light, and allow a radar signal to pass therethrough. The
radar device is configured to transmit the radar signal, receive a
reflection of the radar signal, and generate reflection data based
on the reflected radar signal. The processing circuit is configured
to control operation of the radar device, receive the reflection
data from the radar device, and generate imaging data based on the
transmitted radar signal and the reflection data.
Inventors: |
Driscoll; Tom; (San Diego,
CA) ; Hyde; Roderick A.; (Redmond, WA) ; Kare;
Jordin T.; (San Jose, CA) ; Smith; David R.;
(Durham, NC) ; Tegreene; Clarence T.; (Mercer
Island, WA) ; Wood,, JR.; Lowell L.; (Bellevue,
WA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Elwha LLC |
Bellevue |
WA |
US |
|
|
Assignee: |
Elwha LLC
Bellevue
WA
|
Family ID: |
53399771 |
Appl. No.: |
15/672438 |
Filed: |
August 9, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
15097118 |
Apr 12, 2016 |
9733354 |
|
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15672438 |
|
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|
|
14139659 |
Dec 23, 2013 |
9322908 |
|
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15097118 |
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G01S 2007/027 20130101;
G01S 13/89 20130101; H01Q 3/02 20130101; G01S 13/867 20130101; H01Q
1/42 20130101; H01Q 1/22 20130101; G01S 7/02 20130101; H01Q 1/425
20130101; G01S 13/887 20130101; G01S 7/04 20130101; G01S 13/86
20130101; H01Q 3/26 20130101 |
International
Class: |
G01S 13/88 20060101
G01S013/88; H01Q 3/02 20060101 H01Q003/02; G01S 13/86 20060101
G01S013/86; G01S 7/02 20060101 G01S007/02; H01Q 1/22 20060101
H01Q001/22; G01S 13/89 20060101 G01S013/89; H01Q 3/26 20060101
H01Q003/26; H01Q 1/42 20060101 H01Q001/42 |
Claims
1. A method of concealed radar imaging, comprising: transmitting,
by a radar device, a radar signal through an OLED display
comprising an electroluminescent layer of an organic compound,
wherein the radar device is positioned behind the OLED display, and
wherein the electroluminescent layer is configured to: emit light
to display an image; and allow a radar signal to pass therethrough;
receiving a reflection of the radar signal; generating reflection
data based on the reflection of the radar signal; and generating
imaging data based on the transmitted radar signal and the
reflection data.
2. The method of claim 1, wherein the radar signal is a millimeter
wave signal.
3. The method of claim 1, wherein the radar device is a non-moving
flat panel radar device.
4. The method of claim 3, wherein the flat panel radar device is
coupled to the OLED display.
5. The method of claim 3, wherein the flat panel radar device
includes a phased array of antennas.
6. The method of claim 3, wherein the flat panel radar device
includes a metamaterial surface antenna.
7. The method of claim 1, wherein the radar device is a physically
moving radar scanning device.
8. The method of claim 1, further comprising controlling the
operation of the radar device to facilitate compressive imaging,
and wherein generating the imaging data is based on a compressive
imaging.
9. The method of claim 1, wherein the displayed image includes at
least one of an advertisement, entertainment programming, a map,
and news programming.
10. The method of claim 1, wherein the displayed image is one of a
plurality of images in a video image sequence.
11. The method of claim 1, wherein the OLED display is a computer
display.
12. The method of claim 1, wherein the OLED display is a television
display.
13. The method of claim 1, further comprising detecting a presence
of a viewer, wherein the presence of the viewer is detected using a
sensor, and wherein the image is displayed in response to the
detected viewer.
14. The method of claim 13, wherein the sensor includes an infrared
sensor.
15. The method of claim 13, wherein the sensor includes an
ultrasonic sensor.
16. The method of claim 13, wherein the sensor includes a microwave
sensor
17. The method of claim 13, wherein the sensor includes a
camera.
18. The method of claim 1, further comprising detecting a presence
of a viewer based on the reflection data, and wherein the image is
displayed in response to the detected viewer.
19. A method of concealed radar imaging, comprising: transmitting,
by a flat panel radar device, a radar signal through a static
picture display, wherein the radar device is positioned behind the
static picture display, and wherein the picture display is
configured to: display a static image; and allow a radar signal to
pass therethrough; receiving a reflection of the radar signal;
generating reflection data based on the reflection of the radar
signal; and generating imaging data based on the transmitted radar
signal and the reflection data.
20. The method of claim 19, wherein the radar signal is a
millimeter wave signal.
21. The method of claim 19, wherein the flat panel radar device is
a non-moving flat panel radar device.
22. The method of claim 19, wherein the flat panel radar device is
coupled to the picture display.
23. The method of claim 19, wherein the flat panel radar device
includes a phased array of antennas.
24. The method of claim 19, wherein the flat panel radar device
includes a metamaterial surface antenna.
25. The method of claim 19, wherein the processing circuit is
configured to control the operation of the radar device to
facilitate compressive imaging, and wherein generating the imaging
data is based on a compressive imaging algorithm.
26. The method of claim 19, wherein the static image includes an
advertisement.
27. The method of claim 19, wherein the static image includes a
map.
28. A method of concealed radar imaging, comprising: transmitting,
by a radar device, a radar signal through an active video display,
wherein the radar device is positioned behind the active video
display, and wherein the active video display is configured to:
display a plurality of images forming a video image sequence; and
allow a radar signal to pass therethrough; receiving a reflection
of the radar signal; generating reflection data based on the
reflection of the radar signal; and generating imaging data based
on the transmitted radar signal and the reflection data.
29. The method of claim 28, wherein the radar device is a
non-moving radar device.
30. The method of claim 29, wherein the non-moving radar device is
a flat panel radar device.
31. The method of claim 28, wherein the radar device is a
physically moving radar scanning device.
32. The method of claim 28, further comprising detecting a presence
of a viewer using a sensor, wherein the video image sequence is
displayed in response to the detected viewer.
33. The method of claim 32, wherein detecting the presence of the
viewer comprises imaging the viewer at a face-on or semi face-on
perspective.
34. The method of claim 32, wherein detecting the presence of the
viewer comprises detecting that the viewer is viewing the video
image sequence.
35. The method of claim 28, wherein the video image sequence
comprises one of an advertisement, a television show, and a movie.
Description
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 15/097,118, filed Apr. 12, 2016, which is a
continuation of U.S. patent application Ser. No. 14/139,659, filed
Dec. 23, 2013, each of which are incorporated herein by reference
in their entireties and for all purposes.
BACKGROUND
[0002] In general, radar systems utilize radiofrequency signals to
detect the presence of objects. For example, the position and
motion (e.g., speed and direction) of objects can be determined.
Typically, a radiofrequency signal pulse is transmitted, and then
reflected (backscattered) portions of the signal are analyzed to
ascertain information related to the objects. Additional analysis
and signal processing techniques may also be applied to extrapolate
an image based on the reflected signal.
SUMMARY
[0003] One embodiment relates to a concealed radar imaging system,
including a visible light mirror, a radar device positioned behind
the visible light mirror, and a processing circuit coupled to the
radar device. The visible light mirror includes a reflective layer
configured to reflect visible light, and allow a radar signal to
pass therethrough. The radar device is configured to transmit the
radar signal, receive a reflection of the radar signal, and
generate reflection data based on the reflected radar signal. The
processing circuit is configured to control operation of the radar
device, receive the reflection data from the radar device, and
generate imaging data based on the transmitted radar signal and the
reflection data.
[0004] Another embodiment relates to a method of concealed radar
imaging. The method includes transmitting, by a radar device, a
radar signal through a visible light mirror comprising a reflective
layer, receiving a reflection of the radar signal, generating
reflection data based on the reflected radar signal, and generating
imaging data based on the transmitted radar signal and the
reflection data. The radar device is positioned behind the
reflective layer, and the reflective layer is configured to reflect
visible light, and allow a radar signal to pass therethrough.
[0005] Another embodiment relates to a concealed radar imaging
system, including an OLED display comprising an electroluminescent
layer of an organic compound, a radar device positioned behind the
OLED display, and a processing circuit coupled to the radar device.
The electroluminescent layer is configured to emit light to display
an image, and allow a radar signal to pass therethrough. The panel
radar device is configured to transmit the radar signal, receive a
reflection of the radar signal, and generate reflection data based
on the reflected radar signal. The processing circuit is configured
to control operation of the radar device, receive the reflection
data from the radar device, and generate imaging data based on the
transmitted radar signal and the reflection data.
[0006] Another embodiment relates to a method of concealed radar
imaging. The method includes transmitting, by a radar device, a
radar signal through an OLED display comprising an
electroluminescent layer of an organic compound, where the radar
device is positioned behind the OLED display, and where the
electroluminescent layer is configured to: emit light to display an
image, and allow a radar signal to pass therethrough. The method
further includes receiving a reflection of the radar signal,
generating reflection data based on the reflected radar signal, and
generating imaging data based on the transmitted radar signal and
the reflection data.
[0007] Another embodiment relates to a concealed radar imaging
system, including a picture display, a flat panel radar device
positioned behind the static picture display, and a processing
circuit coupled to the radar device. The picture display is
configured to display a static image, and allow a radar signal to
pass therethrough. The radar device is configured to transmit the
radar signal, receive a reflection of the radar signal, and
generate reflection data based on the reflected radar signal. The
processing circuit is configured to control operation of the radar
device, receive the reflection data from the radar device, and
generate imaging data based on the transmitted radar signal and the
reflection data.
[0008] Another embodiment relates to a method of concealed radar
imaging. The method includes transmitting, by a flat panel radar
device, a radar signal through a static picture display, where the
radar device is positioned behind the static picture display, and
where the picture display is configured to: display a static image
and allow a radar signal to pass therethrough. The method further
includes receiving a reflection of the radar signal, generating
reflection data based on the reflected radar signal, and generating
imaging data based on the transmitted radar signal and the
reflection data.
[0009] The foregoing summary is illustrative only and is not
intended to be in any way limiting. In addition to the illustrative
aspects, embodiments, and features described above, further
aspects, embodiments, and features will become apparent by
reference to the drawings and the following detailed
description.
BRIEF DESCRIPTION OF THE FIGURES
[0010] FIG. 1 is a block diagram of a system for concealed radar
imaging according to one embodiment.
[0011] FIG. 2 is a block diagram of a system for concealed radar
imaging according to one embodiment.
[0012] FIG. 3 is a block diagram of a system for concealed radar
imaging according to one embodiment.
[0013] FIG. 4 is a block diagram of a processing circuit according
to one embodiment.
[0014] FIG. 5 is a schematic diagram of a system for concealed
radar imaging according to one embodiment.
[0015] FIG. 6 is a schematic diagram of a system for concealed
radar imaging according to one embodiment.
[0016] FIG. 7 is a schematic diagram of a system for concealed
radar imaging according to one embodiment.
[0017] FIG. 8 is a flowchart of a process for concealed radar
imaging according to one embodiment.
[0018] FIG. 9 is a flowchart of a process for concealed radar
imaging according to one embodiment.
[0019] FIG. 10 is a flowchart of a process for concealed radar
imaging according to one embodiment.
[0020] FIG. 11 is a flowchart of a process for concealed radar
imaging according to one embodiment.
DETAILED DESCRIPTION
[0021] In the following detailed description, reference is made to
the accompanying drawings, which form a part hereof. In the
drawings, similar symbols typically identify similar components,
unless context dictates otherwise. The illustrative embodiments
described in the detailed description, drawings, and claims are not
meant to be limiting. Other embodiments may be utilized, and other
changes may be made, without departing from the scope of the
subject matter presented here.
[0022] Referring generally to the figures, various embodiments of
systems and methods for concealed radar imaging are shown and
described. In many public places (e.g., an airport, a train
station, a subway, a shopping mall, a city street, etc.) signage
space is valuable for advertising. In such places, it may be
desirable to include radar imaging/scanning devices for security
purposes. Because signage space (e.g., wall space, etc.) is often
limited, there is a tradeoff that exists between installing
advertising fixtures vs. radar imaging systems. In other words, the
installation of a radar imaging system may cost the loss of revenue
that could otherwise be gained if an advertisement were installed
in the same location. In accordance with a number of the
embodiments described herein, a radar imaging system is concealed
(i.e., camouflaged) and placed behind advertisements and other
objects (e.g., mirrors, active video displays, etc.). In this
manner, the radar imaging system can be hidden from a viewer. Also,
the nature of the object concealing the radar (e.g., advertisement,
mirror, display) may be taken advantage of to capture gaze of a
viewer. This allows a viewer to be imaged at a face-on (or semi
face-on) perspective as the viewer looks at the object. Radar
signals generated by the radar imaging system pass through the
object with little to no interference caused by the object. Various
radar devices may be utilized to implement the inventions described
herein. The radar device may include transmitters, receivers,
and/or reflectors. The radar devices described herein may be
configured to transmit millimeter wave signals, and the
configuration of the object in front of a radar device may be
adjusted to minimize interference of radar signals passing
therethrough, as will be discussed further herein.
[0023] Referring to FIG. 1, a block diagram of system 100 for
concealed radar imaging is shown. According to one embodiment,
system 100 includes visible light mirror 102, radar device 104, and
processing circuit 106. Visible light mirror 102 includes a
reflective layer configured to reflect visible light. In one
embodiment, visible light mirror 102 includes a continuous-film
metallic reflective layer. For example, visible light mirror 102
may include a silver-based film layer. As another example, visible
light mirror 102 may include an aluminum-based film layer. The
thickness of the reflective layer is selected such that visible
light is reflected, and radar signals pass therethrough with
minimal interference. The thickness of the reflective layer may be
based on the particular wavelength of radar signals being utilized.
The thickness of the reflective layer is generally less than the
skin depth (for the radar frequency and the conductivity of the
reflective layer) of the radar signal being used by radar device
104. In another embodiment, visible light mirror 102 includes a
reflector that is formed from an array of disconnected metallic
areas attached to a backing layer that allows radar signals to pass
therethrough (e.g., glass, plastic, acrylic glass, etc.). The
spacing between the metallic areas may be selected such that the
gaps between the areas are difficult to resolve by a viewer (e.g.,
subtend less than about 0.1 milliradian of arc), yet the gaps are
large enough to allow a radar signal generated by radar device 104
to pass therethrough. The spacing selected for a certain embodiment
may be based on the expected average distance of a viewer. For
example, in an embodiment where a viewer is expected to be no
closer than 10 meters from visible light mirror 102, a larger
spacing may be implemented as compared to an embodiment where a
viewer is expected to be within 3 meters of visible light mirror
102.
[0024] Radar device 104 includes all components necessary to
transmit and receive a radar signal. For example, radar device may
include one or more antennas, pulse generators, analog to digital
convertors, filters, transmitters, receivers, reflectors, etc.
Radar device 104 is generally arranged behind visible light mirror
102 such that it is obstructed from the view of a viewer.
Alternatively, radar device 104 may be embedded or otherwise
integrated into a frame or structure of visible light mirror 102.
In one embodiment, radar device 104 includes a non-moving flat
panel radar antenna. For example, the flat panel radar antenna may
be a phased array antenna device. As another example, the flat
panel radar antenna may be an MSAT (metamaterial surface antenna
technology) radar device. In another embodiment, radar device 104
includes a physically moving radar device. For example, radar
device 104 may include a dish, a parabolic antenna, an
"orange-peel" antenna, or other type of movable radar antenna. The
antenna may be configured to rotate 360 degrees, or to oscillate a
certain amount. Further, the antenna may be configured to tilt and
pan in any direction. Radar signals from radar device 104 pass
through visible light mirror 102, and reflections of the radar
signal are received by radar device 104. Operation of radar device
104 may be controlled by processing circuit 106, and the sent and
received radar signals may be analyzed by processing circuit 106.
Processing circuit 106 is generally configured to generate the
signals necessary to interface with the components of radar device
104. Processing circuit 106 may cause radar device 104 to transmit
a certain radar signal or signal pattern, and processing circuit
106 may analyze received reflections of the radar signal to form
imaging data based on the signal.
[0025] Referring to FIG. 2, a block diagram of system 200 for
concealed radar imaging is shown. According to one embodiment,
system 200 includes organic light-emitting diode (OLED) display
202, radar device 204, and processing circuit 206. OLED display 202
generally includes a plurality of OLED devices that are formed from
an organic compound, which are arranged to form an
electroluminescent layer (i.e., the screen of the display). OLED
display 202 may emit light via the electroluminescent layer to
display an image. An electric current may be applied to the
electroluminescent layer to cause the electroluminescent layer to
emit light. As an example, OLED display 202 may be an OLED
television or a computer monitor. In one embodiment, OLED display
202 is configured to display a static image or to display a
plurality of images forming a video image sequence. In one
embodiment, OLED display 202 is configured to display a static or
dynamic advertisement. In another embodiment, OLED display 202 is
configured to display a television program. In another embodiment,
OLED display 202 is configured to display a map corresponding to
the location of OLED display 202 (e.g., an airport terminal map, a
train station map, a shopping mall directory, etc.). System 200 may
include additional sensors (e.g., proximity sensors, eye detection
devices, etc.) and processing circuitry configured to detect an
onlooking viewer. In some embodiments, processing circuit 206 may
be configured to detect an onlooking viewer from the radar imaging
data. In this manner, images displayed by OLED display 202 may also
be reactive to a viewer, and various advertisements or other images
may be displayed upon detecting the viewer. Radar device 204
includes all components necessary to transmit and receive a radar
signal, and may be a flat panel or moving radar device. Radar
device 204 is generally positioned behind OLED display 202 (e.g.,
behind the electroluminescent layer) such that it is obstructed
from view from a viewer. Alternatively, radar device 204 may be
embedded or otherwise integrated into a frame or structure of OLED
display 202. For example, radar device 204 may also be incorporated
into a bezel or rear panel of OLED display 202. Radar signals from
radar device 204 may pass through OLED display 202, and reflections
of the radar signal are received by radar device 204. Operation of
radar device 204 may be controlled by processing circuit 206, and
the sent and received radar signals may be analyzed by processing
circuit 206. Processing circuit 206 is generally configured to
generate the signals necessary to interface with the components of
radar device 204. Processing circuit 206 may cause radar device 204
to transmit a radar signal, and processing circuit 206 may form
imaging data based on reflections of the transmitted signal.
[0026] Referring to FIG. 3, a block diagram of system 300 for
concealed radar imaging is shown. According to one embodiment,
system 300 includes picture display 302, flat panel radar device
304, and processing circuit 306. Picture display 302 is generally
configured to display a static image. For example, picture display
302 may be a billboard, a sign, a poster, a painting, and the like,
that displays an image of an advertisement, a map, a directory,
etc. The image displayed by picture display 302 may be printed or
formed using an ink/medium configured to allow radar transmissions
to pass therethrough with minimal absorption. The image displayed
by picture display 302 may be based on the location of picture
display 302 (e.g., an airport map, a shopping mall directory,
etc.). Metallic ink may also be used where the depth of the
metallic ink layer is of a thickness configured to allow the
transmission of radar signals (e.g., millimeter wavelength signals)
to pass therethrough. Flat panel radar device 304 includes all
components necessary to transmit and receive a radar signal. Flat
panel radar device 304 is generally positioned behind picture
display 302 such that it is obstructed from view from a viewer.
Alternatively, flat panel radar device 304 may be embedded or
otherwise integrated into a frame or structure of picture display
302. Radar signals from flat panel radar device 304 may pass
through picture display 302, and reflections of the radar signal
are received by flat panel radar device 304. Operation of flat
panel radar device 304 may be controlled by processing circuit 306,
and the sent and received radar signals may be analyzed by
processing circuit 306. Processing circuit 306 is generally
configured to generate the signals necessary to interface with the
components of flat panel radar device 304. Processing circuit 306
may cause flat panel radar device 304 to transmit a radar signal,
and processing circuit 306 may form imaging data based on
reflections of the transmitted signal.
[0027] Referring to FIG. 4, a block diagram of processing circuit
400 for completing the systems and methods of the present
disclosure is shown according to one embodiment. Processing circuit
400 is generally configured to communicate with a radar device
(e.g., radar devices 104, 204, and 304). Processing circuit 400 can
analyze backscattered radar signals received by the radar device to
generate imaging data (e.g., based on angle, position, strength,
attenuation, noise, timing, range information, etc.). The imaging
data may include any data received or generated based on the
transmitted and backscattered radar signals. In one embodiment, the
imaging data is a function of the angle, position, and/or the range
information related to backscattered radar signals in any
dimension(s). Processing circuit 400 may also generate images
(e.g., two-dimensional and/or three-dimensional images, etc.) based
on the imaging data. In one embodiment, processing circuit 400
utilizes computational imaging techniques in analyzing
backscattered radar signals and generating the imaging data and
images. Processing circuit 400 can also generate the signals
necessary to control the radar device (e.g., to cause the radar
device to emit a radar scanning signal, to cause a moveable radar
device to rotate or pan, to enable/disable radar scanning, etc.).
Processing circuit 400 may accept input data continuously or
periodically. Processing circuit 400 may also base processing on
preference or configuration data. In controlling the radar device
and generating imaging data, processing circuit 400 may make use of
imaging processing techniques and algorithms, machine learning,
artificial intelligence, interactions with databases and database
table lookups, pattern recognition and logging, intelligent
control, neural networks, fuzzy logic, etc. Processing circuit 400
further includes input 402 and output 404. Input 402 is configured
to receive a data stream (e.g., a digital or analog stream of data)
and configuration information. Output 404 is configured to output
data (e.g., imaging data, configuration data during a configuration
process, etc.).
[0028] According to one embodiment, processing circuit 400 includes
processor 406. Processor 406 may be implemented as a
general-purpose processor, an application specific integrated
circuit (ASIC), one or more field programmable gate arrays (FPGAs),
a digital-signal-processor (DSP), a group of processing components,
or other suitable electronic processing components. Processing
circuit 400 also includes memory 408. Memory 408 may be one or more
devices (e.g., RAM, ROM, Flash Memory, hard disk storage, etc.) for
storing data and/or computer code for facilitating the various
processes described herein. Memory 408 may be or may include
non-transient volatile memory or non-volatile memory. Memory 408
may include database components, object code components, script
components, or any other type of information structure for
supporting the various activities and information structures
described herein. Memory 408 may be communicably connected to
processor 406 and provide computer code or instructions to
processor 406 for executing the processes described herein (e.g.,
the processes shown in FIGS. 8-11). Memory 408 may include memory
buffer 410. Memory buffer 410 may be configured to receive a data
stream through input 402. For example, the data stream may include
data related to radar signals that were generated or received by
the radar device. The data received through input 402 may be stored
in memory buffer 410 until memory buffer 410 is accessed for data
by the various modules of memory 408. For example, imaging module
416 can access the data that is stored in memory buffer 410. Any
data received through input 402 may also be immediately
accessed.
[0029] Memory 408 further includes configuration data 412.
Configuration data 412 includes data related to processing circuit
400. For example, configuration data 412 may include information
related to interfacing with other components (e.g., components of a
radar device, etc.). This may also include the command set needed
to interface with a computer system used configure a system having
processing circuit 400. Based on data stored in configuration data
412, processing circuit 400 may format data for output via output
404, which may include formatting data for transmission. For
example, processing circuit 400 may generate imaging data based on
received radar signals, and may format the imaging data (e.g., an
image file) to be transmitted/exported. Processing circuit 400 may
also format data for transmission and form images according to any
protocols or standards as specified by configuration data 412. For
example, processing circuit may form an image of a certain file
type (e.g., .jpg, .raw, .tif, .png, .bmp, a proprietary format,
etc.). Configuration data 412 may further include information as to
how often input should be accepted from a radar device.
Configuration data 412 may include default values required to
initiate communication with any components of the system having
processing circuit 400. Configuration data 412 further includes
data to configure communication between the various components of
processing circuit 400. Configuration data 412 further includes
data related to various networking/communication protocols to allow
an operator to access a device having processing circuit 400. For
example, the device may be accessed via a Wi-Fi network, an
Ethernet network, a USB connection, a serial port connection, etc.
Memory 408 further includes preference data 414, which is
configured to store various operator preferences and settings
related to the systems described herein. For example, the described
systems may be enabled or disabled by an operator as specified by
preference data 414. As another example, the described systems may
be configured to run according to a schedule stored in preference
data 414 as provided by an operator.
[0030] Memory 408 further includes imaging module 416. Imaging
module 416 is configured to receive data from a radar device (e.g.,
radar devices 104, 204, and 304) and to generate radar-imaging data
based on the received data. Imaging module 416 may also cause the
radar device to transmit a radar signal. Imaging module 416 can
access configuration information, preference data, and other data
as provided by processing circuit 400.
[0031] In one embodiment, imaging module 416 generates radar images
based on data provided by a radar device. The data provided by the
radar device is related to radiofrequency radar signals transmitted
by the radar device, and reflections (e.g., backscatter) of the
radar signals off of objects. An image may be generated based on
the energy of the reflections received. In one embodiment, the
radar images are generated using compressive imaging/sensing
techniques, where an image is constructed based on multiple
sampling signals. Imaging module 416 may cause the radar device to
transmit a series of radiofrequency pulse signals (i.e. millimeter
wave signals). The pulse signals may be of the same or differing
frequencies, and the frequencies may depend on a level of
resolution desired (e.g., as specified in configuration data 412,
etc.). Based on the radiofrequency energy that is reflected back
from the pulse signals, an image can be constructed. For example,
in one embodiment, a linear projection can be used to acquire a
representation of a compressed signal based on measurements of the
reflected pulse signals. An image may then be formed by
reconstructing the compressed signal (e.g., via a linear or greedy
pursuit algorithm, etc.). It should be understood that the scope of
the present disclosure is not limited to a certain type of
compressive imaging, and other compressive imaging techniques may
be used.
[0032] In one embodiment, a radar device is positioned behind a
visible light mirror (e.g., visible light mirror 102). The radar
signals generated by the radar device may be transmitted and
received through the mirror, thereby allowing imaging module 416 to
generate a radar image based on the signals. In one embodiment, the
visible light mirror includes a film metallic reflector. The film
may be continuous (i.e. no separations for the length and width of
the reflector) and may be of a thickness that is less than the skin
depth of the radar signal being generated by the radar device. In
this manner, the visible light mirror is visually reflective, but
allows the transmission of many frequencies of millimeter wave
signals. In another embodiment, the visible light mirror includes a
reflector that comprises an array of disconnected metallic areas.
The areas are each of a length and width that are large as compared
to wavelengths associated with visible light, and small as compared
to wavelengths associated with radar signals. The spacing between
areas of the array is configured to be small enough so as to be
visually unresolvable by a viewer. The size of the spacing utilized
may be based on an estimated average location of a viewer. For
example, the spacing used for a first configuration where the
viewer is expected to be 5 meters from the mirror may be larger
than the spacing used for a second configuration where the viewer
is expected to be 2 meters from the mirror. The scope of the
present disclosure is not limited to a certain expected viewer
distance. In another embodiment, the visible light mirror may
include a multilayer dielectric reflector. Based on the type and
thickness of the dielectric layers, a specified reflectivity of
visible light may be produced, while still allowing the
transmission of radar signals.
[0033] The radar device may include various types of radar
antennas. In one embodiment, the radar device includes a non-moving
flat panel radar antenna. For example, the flat panel radar antenna
may be a phased array antenna. The phased array generally includes
an array of multiple antennas in which the phases of the signals
from the antennas are varied such that the effective radiation
pattern of the entire array is focused in a certain direction and
suppressed in an undesired direction. As another example, the flat
panel radar device may include a metamaterial surface antenna
(e.g., an MSAT-type radar).
[0034] In one embodiment, the radar device includes a physically
moving antenna. The physically moving antenna may rotate, pan,
and/or tilt as the radar device is scanning (transmitting and
receiving radar signals). For example, the physically moving
antenna may be a rectangular antenna, a dish, or other parabolic
antenna (e.g., an "orange-peel" type) that is configured to rotate
about a central axis. The rate and direction of rotation may be
controlled by imaging module 416 and may be based on settings
stored in configuration data 412.
[0035] In one embodiment, a radar device is positioned behind an
OLED display (e.g., OLED display 202). The radar device may include
a flat panel radar antenna, which may be entirely behind the OLED
display (e.g., behind the back panel of the display) or may be
embedded/integrated into the OLED display (e.g., behind the screen
of the display but in front of a back panel. In an alternative
embodiment, the flat panel antenna of the radar device may be
embedded/integrated into the bezel of the OLED display. In general,
the radar device may image though the OLED display as the organic
components of the display are transmissive to millimeter wavelength
signals. In one embodiment, the flat panel antenna is a phased
array antenna. In another embodiment, the flat panel antenna is a
metamaterial surface antenna (e.g., an MSAT-type radar). In another
embodiment, the radar device includes a movable antenna.
[0036] In one embodiment, the OLED display is configured to display
an advertisement in order to capture the gaze of a viewer.
Alternatively, the OLED display may display entertainment
programming, news programming, a map, and the like. In one
embodiment, the OLED display is a computer monitor that is
communicably coupled to a computing system. In another embodiment
the OLED display is a television. Images displayed by the OLED
display may be static or dynamic. Further, images displayed by the
OLED display may be based on the presence or gaze of a viewer. For
example, the system or the OLED display can include components
configured to detect the presence of a viewer (e.g., proximity
sensors, infrared sensors, ultrasonic sensors, microwave sensors, a
camera, the radar, etc.). The viewer detection components may also
detect the eyes and gaze of a viewer. In this manner, the OLED
display may be reactive to a viewer and display certain content in
an attempt to retain the gaze of a viewer so that the viewer can be
imaged by the radar device and imaging module 416 as the viewer is
looking towards the display. Although OLED displays are discussed
herein, it should be understood that other types of displays (e.g.,
LED, LCD, e-Ink, etc.) may also be used to implement the display
(e.g., display 202) if the display is constructed using components
that are transmissive to millimeter wavelength signals such that
the radar device may image though the display as disclosed.
[0037] In one embodiment, a radar device is positioned behind a
static picture display (e.g., picture display 302) that is
configured to display an advertisement. For example, the static
picture display may be a poster, a billboard, a sign, and the like.
The radar device may include a flat panel radar antenna that can
image through the static picture display. In one embodiment, the
flat panel antenna is a phased array antenna. In another
embodiment, the flat panel antenna is a metamaterial surface
antenna (e.g., an MSAT-type radar). In another embodiment, the
radar device includes a movable antenna.
[0038] Referring to FIG. 5, a schematic diagram of concealed radar
imaging system 500 is shown according to one embodiment. System 500
includes display 502, radar device 504, and processing circuit 506.
Display 502 may be any of the types of displays discussed herein.
For example, display 502 may be a visible light mirror with a film
reflector (area 508). As another example, display 502 may be an
OLED television with an OLED display area (area 508). The OLED
television may display static or dynamic content (e.g.,
advertisements). As another example, display 502 may be a static
picture display that depicts an advertisement on its surface (area
508). Radar device 504 is a flat-panel radar device that is
positioned behind display 502. For example, radar device 504 may be
coupled to the back of display 502. As another example, radar
device 504 may be positioned in a compartment within a wall or
structure to which display 502 is mounted. Processing circuit is
communicably coupled to radar device 504 and causes radar device to
emit a radar signal through display 502. The radar signal may
reflect off of viewer 510, and reflections of the signal may be
received through the display by radar device 504. Processing
circuit may analyze the radar signals to generate a radar image as
described above.
[0039] Referring to FIG. 6, a schematic diagram of concealed radar
imaging system 600 is shown according to one embodiment. System 600
includes visible light mirror 602, radar device 604, and processing
circuit 606. Visible light mirror 602 is depicted as having
reflector 608 that is formed from an array of disconnected metallic
areas. It should be noted, that the scale, dimensions, and
positioning of the disconnected areas are for illustrative purposes
and are in no way limiting. The spacing between the areas is
configured to be small enough such that viewer 610 is unable to
resolve the spacing. Radar device 604 is a flat-panel radar device
that is positioned behind visible light mirror 602. For example,
radar device 604 may be coupled to the back of visible light mirror
602. As another example, radar device 604 may be positioned in a
compartment within a wall/structure to which visible light mirror
602 is mounted. Processing circuit is communicably coupled to radar
device 604 and causes radar device to emit a radar signal through
visible light mirror 602. The radar signal may reflect off of
viewer 610, and reflections of the signal may be received through
the display by radar device 604. Processing circuit may analyze the
radar signals to generate a radar image as described above.
[0040] Referring to FIG. 7, a schematic diagram of concealed radar
imaging system 700 is shown according to one embodiment. System 700
includes display 702, radar device 704, and processing circuit 706.
Display 702 may be any of the types of displays discussed herein.
For example, display 702 may be a visible light mirror with a
continuous film reflector or an array of reflective areas. As
another example, display 702 may be an OLED television with an OLED
display. As another example, display 702 may be a static picture
display. Radar device 704 has a physically moving antenna, and is
positioned behind display 702. For example radar device 704 may
include a moving dish, parabolic, "orange-peel," or flat antenna
that is capable of movement. Radar device 704 may rotate, pan, or
tilt in a direction as controlled by processing circuit 706. For
example, the movement of the antenna may be based on a certain
scanning pattern or compressive imaging algorithm being utilized.
Processing circuit is communicably coupled to radar device 704 and
causes radar device to emit a radar signal through display 702. The
radar signal may reflect off of viewer 708, and reflections of the
signal may be received through the display by radar device 704.
Processing circuit may analyze the radar signals to generate a
radar image as described above.
[0041] Referring to FIG. 8, a flow diagram of a process 800 for
concealed radar imaging is shown, according to one embodiment. In
alternative embodiments, fewer, additional, and/or different
actions may be performed. Also, the use of a flow diagram is not
meant to be limiting with respect to the order of actions
performed. A radar device that is positioned behind a visible light
mirror transmits a radar signal through the visible light mirror
(802). The visible light mirror may have a reflective layer that is
a continuous metallic film, an array of disconnected metallic
areas, or a multilayer dielectric reflector. The radar signals may
reflect and backscatter off of an object (e.g., a viewer), and the
reflections are received by the radar device (804). Based on the
reflected radar signals, reflection data is generated (806). The
reflection data and data related to the transmitted radar signals
(e.g., transmission strengths, direction, wavelength, frequency,
timing information, etc.) are used by an imaging algorithm to
generate radar imaging data (808).
[0042] Referring to FIG. 9, a flow diagram of a process 900 for
concealed radar imaging is shown, according to one embodiment. In
alternative embodiments, fewer, additional, and/or different
actions may be performed. Also, the use of a flow diagram is not
meant to be limiting with respect to the order of actions
performed. A radar device that is positioned behind an OLED display
transmits a radar signal through the OLED display (902). The OLED
display may be part of a television, or computer monitor, etc., and
may display an advertisement. The radar signals may reflect and
backscatter off of an object (e.g., a viewer), and the reflections
are received by the radar device (904). Based on the reflected
radar signals, reflection data is generated (906). The reflection
data and data related to the transmitted radar signals (e.g.,
transmission strengths, direction, wavelength, frequency, timing
information, etc.) are used by a compressive imaging algorithm to
generate radar imaging data (908).
[0043] Referring to FIG. 10, a flow diagram of a process 1000 for
concealed radar imaging is shown, according to one embodiment. In
alternative embodiments, fewer, additional, and/or different
actions may be performed. Also, the use of a flow diagram is not
meant to be limiting with respect to the order of actions
performed. An OLED display includes a viewer detection system. The
viewer detection system can detect the presence of a viewer (e.g.,
using a proximity sensor, a radar, or a camera, etc.). In response
to a detected viewer, the OLED display may display a particular
advertisement or image. A radar device that is positioned behind
the OLED display transmits a radar signal through the OLED display
(1006). The OLED display may be part of a television, or computer
monitor, etc. The radar signals may reflect and backscatter off of
an object (e.g., a viewer), and the reflections are received by the
radar device (1008). Based on the reflected radar signals,
reflection data is generated (1010). The reflection data and data
related to the transmitted radar signals (e.g., transmission
strengths, direction, wavelength, frequency, timing information,
etc.) are used by a compressive imaging algorithm to generate radar
imaging data (1012).
[0044] Referring to FIG. 11, a flow diagram of a process 1100 for
concealed radar imaging is shown, according to one embodiment. In
alternative embodiments, fewer, additional, and/or different
actions may be performed. Also, the use of a flow diagram is not
meant to be limiting with respect to the order of actions
performed. A flat panel radar device that is positioned behind a
static picture display (e.g., a sign, a billboard, a poster, etc.)
transmits a radar signal through the static picture display (1102).
The static picture display may display an advertisement. For
example, the static picture display may be a sign that is hung on
the wall in an airport or other public area. The radar signals may
reflect and backscatter off of an object (e.g., a viewer), and the
reflections are received by the radar device (1104). Based on the
reflected radar signals, reflection data is generated (1106). The
reflection data and data related to the transmitted radar signals
(e.g., transmission strengths, direction, wavelength, frequency,
timing information, etc.) are used by a compressive imaging
algorithm to generate radar imaging data (1108).
[0045] The construction and arrangement of the systems and methods
as shown in the various embodiments are illustrative only. Although
only a few embodiments have been described in detail in this
disclosure, many modifications are possible (e.g., variations in
sizes, dimensions, structures, shapes and proportions of the
various elements, values of parameters, mounting arrangements, use
of materials, colors, orientations, etc.). For example, the
position of elements may be reversed or otherwise varied and the
nature or number of discrete elements or positions may be altered
or varied. Accordingly, all such modifications are intended to be
included within the scope of the present disclosure. The order or
sequence of any process or method steps may be varied or
re-sequenced according to alternative embodiments. Other
substitutions, modifications, changes, and omissions may be made in
the design, operating conditions and arrangement of the embodiments
without departing from the scope of the present disclosure.
[0046] The present disclosure contemplates methods, systems and
program products on any machine-readable media for accomplishing
various operations. The embodiments of the present disclosure may
be implemented using existing computer processors, or by a special
purpose computer processor for an appropriate system, incorporated
for this or another purpose, or by a hardwired system. Embodiments
within the scope of the present disclosure include program products
comprising machine-readable media for carrying or having
machine-executable instructions or data structures stored thereon.
Such machine-readable media can be any available media that can be
accessed by a general purpose or special purpose computer or other
machine with a processor. By way of example, such machine-readable
media can comprise RAM, ROM, EPROM, EEPROM, CD-ROM or other optical
disk storage, magnetic disk storage or other magnetic storage
devices, or any other medium which can be used to carry or store
desired program code in the form of machine-executable instructions
or data structures and which can be accessed by a general purpose
or special purpose computer or other machine with a processor. When
information is transferred or provided over a network or another
communications connection (either hardwired, wireless, or a
combination of hardwired or wireless) to a machine, the machine
properly views the connection as a machine-readable medium. Thus,
any such connection is properly termed a machine-readable medium.
Combinations of the above are also included within the scope of
machine-readable media. Machine-executable instructions include,
for example, instructions and data which cause a general purpose
computer, special purpose computer, or special purpose processing
machines to perform a certain function or group of functions.
[0047] Although the figures may show a specific order of method
steps, the order of the steps may differ from what is depicted.
Also two or more steps may be performed concurrently or with
partial concurrence. Such variation will depend on the software and
hardware systems chosen and on designer choice. All such variations
are within the scope of the disclosure. Likewise, software
implementations could be accomplished with standard programming
techniques with rule-based logic and other logic to accomplish the
various connection steps, processing steps, comparison steps and
decision steps.
[0048] While various aspects and embodiments have been disclosed
herein, other aspects and embodiments will be apparent to those
skilled in the art. The various aspects and embodiments disclosed
herein are for purposes of illustration and are not intended to be
limiting, with the true scope being indicated by the following
claims.
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