Imaging system using WiFi signals

1. A passive incoherent millimeter-wave imaging system comprising:

a receiver array including a plurality of receive modules configured to receive a scene signal reflected from a scene, wherein the scene signal is reflected in response to a plurality of incoherent communication signals being reflected off the scene, and wherein the plurality of incoherent communication signals are spatially and temporally incoherent at a point when reaching the scene;

a passive incoherent millimeter-wave image processor configured to receive the scene signal reflected from the scene, determining a scene visibility of the scene signal reflected from the scene and construct a reconstructed scene based on a transformation of the scene visibility; and

a display module configured to display the reconstructed scene.

2. The imaging system of claim 1 wherein the passive incoherent millimeter-wave image processor is configured to construct the reconstructed scene by:

determining a sampled visibility using the scene visibility and a sampling function.

3. The imaging system of claim 2 wherein the sampled visibility is a product of the scene visibility and the sampling function.

4. The imaging system of claim 2 wherein the passive incoherent millimeter-wave image processor is configured to construct the reconstructed scene by:

determining an inverse Fourier Transform of the sampled visibility as the transformation to form the reconstructed scene.

5. The imaging system of claim 1 wherein:

the plurality of incoherent communication signals are received from a plurality of wireless communication devices.

6. The imaging system of claim 5 wherein:

the plurality of incoherent communication signals are received from the plurality of wireless communication devices in response to a distance between the receiver array and each wireless router of the plurality of wireless communication devices being less than a predetermined threshold.

7. The imaging system of claim 5 wherein:

each communication device of the plurality of wireless communication devices produces an unsynchronized signal that is incoherent at the scene.

8. The imaging system of claim 7 wherein:

each communication device of the plurality of wireless communication devices produces a signal at the same or a different frequency.

9. The imaging system of claim 1 wherein:

each incoherent communication signal of the plurality of incoherent communication signals are based on different frequency sources.

10. The imaging system of claim 1 wherein:

the plurality of incoherent communication signals are received from a plurality of wireless devices.

11. The imaging system of claim 1 wherein:

the plurality of incoherent communication signals include at least three incoherent communication signals.

12. The imaging system of claim 1 , wherein:

the receiver array is configured to receive the scene signal at a set of spatial frequencies; and

the set of spatial frequencies are based on a distance and an angle between pairs of receiving modules.

13. The imaging system of claim 1 , wherein the passive incoherent millimeter-wave image processing module constructs the reconstructed scene using spatial frequency sampling.

14. An imaging system comprising:

(a) a receiver array, a display device, and a processor with an associated memory configured to store instructions, wherein the receiver array is configured to receive a scene signal reflected from a scene, wherein the scene signal is reflected in response to a plurality of incoherent communication signals being reflected off the scene, and wherein the plurality of incoherent communication signals are spatially and temporally incoherent at a point when reaching the scene; and

(b) the instructions cause the processor to construct a reconstructed scene by:

receiving at least three incoherent communication signals reflected off the scene at the receiver array;

determining a scene visibility based on the at least three incoherent communication signals;

identifying a sampling function;

calculating a sampled visibility based on the scene visibility and the sampling function; and

performing an inverse Fourier transform of the sampled visibility to construct the reconstructed scene.

15. The imaging system of claim 14 wherein:

the receiver array is a sparse array.

16. The imaging system of claim 14 wherein the receiver array is arranged in a T-shaped configuration.

17. The imaging system of claim 14 wherein the receiver array is arranged in a Y-shaped configuration.

18. The imaging system of claim 14 wherein:

the plurality of incoherent communication signals are received from a plurality of wireless communication devices in response to a distance between the receiver array and each wireless communication device of the plurality of wireless communication devices being less than a predetermined threshold.

19. The imaging system of claim 18 wherein:

each communication device of the plurality of wireless communication devices produces an unsynchronized signal that is incoherent at the scene and at the same or a different frequency.

20. An passive incoherent millimeter-wave imaging method comprising:

receiving, from a plurality of communication devices, a scene signals including a plurality of incoherent communication signals reflected off a scene, wherein the scene signal is received by a receiver array including a plurality of receive modules, and wherein the plurality of incoherent communication signals are spatially and temporally incoherent at a point when reaching the scene;

constructing a reconstructed scene based on the scene signal reflected from the scene by:

determining a scene visibility based on the scene signals;

identifying a sampling function;

calculating a sampled visibility based on the scene visibility and the sampling function; and

performing an inverse Fourier transform of the sampled visibility to construct the reconstructed scene; and

displaying the reconstructed scene on a display screen.