DETERMINING EMITTER LOCATIONS

• US 20180007653A1
• Filed: 05/19/2017
• Published: 01/04/2018
• Est. Priority Date: 06/30/2016
• Status: Active Grant

• Current Assignee: HawkEye 360, Inc. (Advance Publications Incorporated)
• Original Assignee: HawkEye 360, Inc. (Advance Publications Incorporated)
• Inventors: O'Shea, Timothy James, McGwier, Robert W., McCarthy, Nicholas Aaron
• Granted Patent: US 10,057,873 B2
• Time in Patent Office: Days
• CPC Class Codes: G01S 5/02 using radio waves using satellite radio beacon systems for determining position G01S19/00
• CPC Class Codes: G01S 5/0246 involving frequency difference of arrival or Doppler measurements G01S5/02685 takes precedence
• CPC Class Codes: G01S 5/0249 Determining position using measurements made by a non-stationary device other than the device whose position is being determined
• CPC Class Codes: G01S 5/0252 Radio frequency fingerprinting
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

First information corresponding to a radio signal received at a first sensing device from a candidate location is obtained. Second information corresponding to a radio signal received at a second sensing device from the candidate location is obtained. A first relationship between the first sensing device and the candidate location and a second relationship between the second sensing device and the candidate location are determined. A first inverse and a second inverse of respectively the first and second relationships are obtained. A first estimate of the radio signal at the first sensing device is determined from the first information and the first inverse. A second estimate of the radio signal at the second sensing device is determined from the second information and the second inverse. Energy emitted from the candidate location is measured based on the first estimate and the second estimate.

Claims

1. (canceled)

2. A method comprising:

obtaining, from a first sensing device, first information corresponding to a first radio signal received at the first sensing device from a candidate location;

obtaining, from a second sensing device, second information corresponding to a second radio signal received at the second sensing device from the candidate location;

determining a first relationship between the first sensing device and the candidate location and a second relationship between the second sensing device and the candidate location;

obtaining a first inverse of the first relationship and a second inverse of the second relationship;

determining a first estimate of the first radio signal based on the first information and the first inverse, and a second estimate of the second radio signal based on the second information and the second inverse; and

computing an energy emitted from the candidate location based on the first estimate and the second estimate.

3. The method of claim 2, wherein determining the first relationship between the first sensing device and the candidate location comprises:

determining a first delay associated with the first radio signal; and

determining a first Doppler offset associated with the first radio signal,

wherein at least one of the first delay or the first Doppler offset is determined based on a known trajectory of the first sensing device.

4. The method of claim 3, wherein obtaining the first inverse of the first relationship comprises:

determining an inverse of the first delay; and

determining an inverse of the first Doppler offset.

5. The method of claim 2, wherein obtaining the first inverse of the first relationship comprises:

obtaining a prediction of the candidate location;

obtaining knowledge of a trajectory of the first sensing device;

determining a position of the first sensing device at a first time based on the knowledge of the trajectory; and

obtaining the first inverse of the first relationship based on the prediction of the candidate location and the position of the first sensing device at the first time.

6. The method of claim 5, wherein determining the first estimate of the first radio signal comprises:

in response to obtaining the prediction of the candidate location and determining the position of the first sensing device at the first time, computing a convolution of;

(i) the first information and (ii) the first inverse of the first relationship.

7. The method of claim 2, wherein computing the energy emitted from the candidate location comprises:

determining that time is synchronized between the first sensing device and the second sensing device; and

in response to determining that time is synchronized, computing the energy emitted from the candidate location.

8. The method of claim 2, wherein computing the energy emitted from the candidate location comprises computing the energy emitted from the candidate location based on the first estimate, the second estimate and a third estimate corresponding to a third sensing device, the method comprising:

obtaining, from the third sensing device, third information corresponding to a third radio signal received at the third sensing device from the candidate location;

determining a third relationship between the third sensing device and the candidate location;

obtaining a third inverse of the third relationship;

determining a third estimate of the third radio signal based on the third information and the third inverse; and

computing the energy emitted from the candidate location based on the first estimate, the second estimate and the third estimate.

9. A non-transitory computer-readable medium storing instructions that, when executed by one or more processors, are configured to cause the one or more processors to perform operations comprising:

obtaining, from a first sensing device, first information corresponding to a first radio signal received at the first sensing device from a candidate location;

obtaining, from a second sensing device, second information corresponding to a second radio signal received at the second sensing device from the candidate location;

determining a first relationship between the first sensing device and the candidate location and a second relationship between the second sensing device and the candidate location;

obtaining a first inverse of the first relationship and a second inverse of the second relationship;

determining a first estimate of the first radio signal based on the first information and the first inverse, and a second estimate of the second radio signal based on the second information and the second inverse; and

computing an energy emitted from the candidate location based on the first estimate and the second estimate.

10. The non-transitory computer-readable medium of claim 9, wherein determining the first relationship between the first sensing device and the candidate location comprises:

determining a first delay associated with the first radio signal; and

determining a first Doppler offset associated with the first radio signal,

wherein at least one of the first delay or the first Doppler offset is determined based on a known trajectory of the first sensing device.

11. The non-transitory computer-readable medium of claim 10, wherein obtaining the first inverse of the first relationship comprises:

determining an inverse of the first delay; and

determining an inverse of the first Doppler offset.

12. The non-transitory computer-readable medium of claim 9, wherein obtaining the first inverse of the first relationship comprises:

obtaining a prediction of the candidate location;

obtaining knowledge of a trajectory of the first sensing device;

determining a position of the first sensing device at a first time based on the knowledge of the trajectory; and

obtaining the first inverse of the first relationship based on the prediction of the candidate location and the position of the first sensing device at the first time.

13. The non-transitory computer-readable medium of claim 12, wherein determining the first estimate of the first radio signal comprises:

in response to obtaining the prediction of the candidate location and determining the position of the first sensing device at the first time, computing a convolution of;

(i) the first information and (ii) the first inverse of the first relationship.

14. The non-transitory computer-readable medium of claim 9, wherein computing the energy emitted from the candidate location comprises:

determining that time is synchronized between the first sensing device and the second sensing device; and

in response to determining that time is synchronized, computing the energy emitted from the candidate location.

15. The non-transitory computer-readable medium of claim 9, wherein computing the energy emitted from the candidate location comprises computing the energy emitted from the candidate location based on the first estimate, the second estimate and a third estimate corresponding to a third sensing device, the operations comprising:

obtaining, from the third sensing device, third information corresponding to a third radio signal received at the third sensing device from the candidate location;

determining a third relationship between the third sensing device and the candidate location;

obtaining a third inverse of the third relationship;

determining a third estimate of the third radio signal based on the third information and the third inverse; and

computing the energy emitted from the candidate location based on the first estimate, the second estimate and the third estimate.

16. A system comprising:

a first sensing device and a second sensing device;

one or more processors; and

a storage medium storing instructions that, when executed by the one or more processors, are configured to cause the one or more processors to perform operations comprising;

obtaining, from the first sensing device, first information corresponding to a first radio signal received at the first sensing device from a candidate location;

obtaining, from the second sensing device, second information corresponding to a second radio signal received at the second sensing device from the candidate location;

determining a first relationship between the first sensing device and the candidate location and a second relationship between the second sensing device and the candidate location;

obtaining a first inverse of the first relationship and a second inverse of the second relationship;

determining a first estimate of the first radio signal based on the first information and the first inverse, and a second estimate of the second radio signal based on the second information and the second inverse; and

computing an energy emitted from the candidate location based on the first estimate and the second estimate.

17. The system of claim 16, wherein determining the first relationship between the first sensing device and the candidate location comprises:

determining a first delay associated with the first radio signal; and

determining a first Doppler offset associated with the first radio signal,

wherein at least one of the first delay or the first Doppler offset is determined based on a known trajectory of the first sensing device.

18. The system of claim 17, wherein obtaining the first inverse of the first relationship comprises:

determining an inverse of the first delay; and

determining an inverse of the first Doppler offset.

19. The system of claim 16, wherein obtaining the first inverse of the first relationship comprises:

obtaining a prediction of the candidate location;

obtaining knowledge of a trajectory of the first sensing device;

determining a position of the first sensing device at a first time based on the knowledge of the trajectory; and

obtaining the first inverse of the first relationship based on the prediction of the candidate location and the position of the first sensing device at the first time.

20. The system of claim 19, wherein determining the first estimate of the first radio signal comprises:

in response to obtaining the prediction of the candidate location and determining the position of the first sensing device at the first time, computing a convolution of;

(i) the first information and (ii) the first inverse of the first relationship.

21. The system of claim 16, wherein computing the energy emitted from the candidate location comprises:

determining that time is synchronized between the first sensing device and the second sensing device; and

in response to determining that time is synchronized, computing the energy emitted from the candidate location.

22. The system of claim 16, further comprising a third sensing device, wherein computing the energy emitted from the candidate location comprises computing the energy emitted from the candidate location based on the first estimate, the second estimate and a third estimate corresponding to the third sensing device, the operations comprising:

obtaining, from the third sensing device, third information corresponding to a third radio signal received at the third sensing device from the candidate location;

determining a third relationship between the third sensing device and the candidate location;

obtaining a third inverse of the third relationship;

determining a third estimate of the third radio signal based on the third information and the third inverse; and

computing the energy emitted from the candidate location based on the first estimate, the second estimate and the third estimate.