System and method for radio frequency penetration imaging of an object

• US 10,290,948 B2
• Filed: 08/02/2016
• Issued: 05/14/2019
• Est. Priority Date: 08/02/2015
• Status: Active Grant

• Current Assignee: Vayyar Imaging Ltd.
• Original Assignee: Vayyar Imaging Ltd.
• Inventors: Hoffman, Damian, Rosenfeld, Jonathan
• Primary Examiner(s): Mancuso, Huedung X
• Application Number:
  US15/226,048
• Publication Number:
  US 20170033469A1
• Time in Patent Office: 1,015 Days
• Field of Search: 343909
• CPC Class Codes: G01S 13/888 through wall detection
• CPC Class Codes: G01S 13/89 for mapping or imaging
• CPC Class Codes: H01Q 1/225 used in level-measurement devices, e.g. for level gauge measurement
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 17/00 Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
• CPC Class Codes: H01Q 21/00 Antenna arrays or systems arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system H01Q3/00
• CPC Class Codes: H01Q 21/061 Two dimensional planar arrays
• CPC Class Codes: H01Q 5/00 Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements combinations of separate active antenna units operating in different wavebands and connected to a common feeder system H01Q21/30

Abstract

A system and methods for RF (Radio Frequency) penetration imaging of one or more objects in a medium, the system comprising: a generation and reception unit configured to generate and receive RF signals; an antenna array configured to transmit/receive the RF signals, the antenna array comprises a plurality of antennas: and a processor in communication with said antenna array, said processor is configured to analyze said RF signals and estimate the distance between the antenna array and the object, and in addition the relative orientation between the antenna array and the medium surface.

Claims

1. A RF (Radio Frequency) imaging system, for imaging at least one object within a target medium, the system comprising

a generation and reception subsystem configured to generate and receive a plurality of RF signals;

an RF antenna array, the RF antenna array comprises a plurality of antennas, said plurality of antennas are configured to transmit the plurality of RF signals towards the target medium and receive a plurality of RF signals reflected from the target medium;

a data acquisition subsystem configured to receive and store said plurality of reflected RF signals; and

at least one processor, said at least one processor is configured to;

estimate the distance between the surface of the target medium and the antenna array;

estimate the delay between the plurality of transmitted signals and the plurality of signals reflected from the at least one object, wherein the delay is estimated using a dedicated frequency sub-band of the received signals;

estimate the location of the plurality of antennas at each transmitting time; and

provide an image of the at least one object location and the intensity of the plurality of reflected RF signals.

2. The system of claim 1, wherein said at least one processor is configured to analyze the angular orientation between the antenna array and the target medium surface.

3. The system of claim 1, wherein the system comprises a display and wherein the image is displayed on said display.

4. The system of claim 1, wherein an interim medium is located between the target medium and the antenna array of the imaging system and the antenna array is positioned or moved in a distance from the target medium.

5. The system of claim 4, wherein the distance is constant or variable.

6. The system of claim 4, wherein the distance is larger than a wavelength.

7. The system of claim 1, wherein the interim medium or the target medium is selected from the group consisting of:

air, concrete, plaster, fluids, human tissues.

8. The system of claim 1, wherein the image is 2D (two dimension) or 3D (three dimension) image.

9. The system of claim 1, wherein the RF signals are Ultra Wide Band signals.

10. The system of claim 1, wherein the RF imaging system is portable.

11. The system of claim 1, wherein the antenna array is configured to communicate with orientation or measurements devices, said devices are selected from the group consisting of:

accelerometers, gyros, laser distance measurement devices.

12. The system of claim 1, wherein the distance between the surface of the target medium and the antenna array is estimated using the high frequency band of the plurality of received signals.

13. A method for imaging at least one object within a target medium, the method comprising:

transmitting a plurality of RF (radio frequency) signals by an RF antenna array, said RF antenna array comprises a plurality of RF antennas;

receiving at said RF antenna array a plurality of RF signals reflected from the at least one object;

estimating the distance between the surface of the target medium and the antenna array;

estimating the delay between the plurality of transmitted signals and the received signals reflected from the at least one object, wherein the delay is estimated using a dedicated frequency sub-band of the received signals;

estimating a location of the plurality of RF antennas at each transmitting time of said plurality of transmitted signals; and

providing an image of the at least one object location.

14. The method of claim 13, comprising providing the intensity of the reflected RF signals from the at least one object.

15. The method of claim 13, comprising estimating the presence or lack of the at least one object.

16. The method of claim 13, wherein an interim medium is located between the target medium and the antenna array of the imaging system and the antenna array is positioned or moved in a distance from the target medium.

17. The method of claim 16, wherein the distance is constant or variable.

18. The method of claim 13, wherein the angular orientation between the antenna array and the target medium surface is estimated from the received signals.

19. The method of claim 13, wherein the distance between the surface of the target medium and the antenna array is estimated using the high frequency band of the plurality of received signals.

20. The method of claim 13, wherein the estimation of the location or orientation of the antenna array is improved using measurements from at least one or more accelerometers, gyros, cameras, laser devices.