Methods and devices for determining the location of remotely emplaced objects, such as munitions

Patent metadata

Field	Value
Publication number	US-10031222-B2
Application number	US-201615062144-A
Country	US
Kind code	B2
Filing date	Mar 6, 2016
Priority date	Mar 7, 2015
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A method for determining a location of remotely emplaced objects. The method including: (a) scanning a field for one or more remotely emplaced objects with a reference source signal from a reference source; (b) detecting the signal at one or more orientation sensors associated with each of the one or more remotely emplaced objects; (c) determining an angular direction of each of the one or more remotely emplaced objects relative to the reference source based on the signal received at the one or more orientation sensors associated with each of the one or more remotely emplaced objects; (d) directing a range signal from the reference source towards each of the remotely emplaced objects at a corresponding determined angular direction; (e) in response to the range signal, transmitting a response signal from each of the remotely emplaced objects to the reference source; and (f) determining a range for each of the one or more remotely emplaced objects relative to the reference source at the determined angular direction based at least partially on the range and response signals.

First claim

What is claimed is:

1. A method for determining a location of remotely emplaced objects, the method comprising:
(a) scanning a field for one or more remotely emplaced objects with a reference source signal from a reference source;
(b) detecting the signal at one or more orientation sensors associated with each of the one or more remotely emplaced objects;
(c) determining an angular direction of each of the one or more remotely emplaced objects relative to the reference source based on the signal received at the one or more orientation sensors associated with each of the one or more remotely emplaced objects;
(d) directing a range signal from the reference source towards each of the remotely emplaced objects at a corresponding determined angular direction;
(e) in response to the range signal, transmitting a response signal from each of the remotely emplaced objects to the reference source; and
(f) determining a range for each of the one or more remotely emplaced objects relative to the reference source at the determined angular direction based at least partially on the range and response signals.

2. The method of claim 1 , further comprising building a map of a position of the one or more remotely emplaced objects based on the determined angular direction and range for each of the one or more remotely emplaced objects.

3. The method of claim 1 , further comprising each of the one or more remotely emplaced objects transmitting a unique identity code.

4. The method of claim 1 , further comprising, prior to step (a), transmitting a wake up signal from the reference source to each of the one or more remotely emplaced objects.

5. The method of claim 4 , further comprising, subsequent to the transmitting of the wake up signal, switching the one or more remotely emplaced objects from a dormant mode.

6. The method of claim 1 , wherein step (a) comprises scanning at stepped power levels, from a minimum power level to a maximum power level.

7. The method of claim 6 , further comprising continuing the scanning until all of the one or more remotely emplaced objects respond with an activation signal.

8. The method of claim 7 , wherein the activation signal provides an identification code and a received signal quality.

9. The method of claim 8 , further comprising selecting a minimal transmitter power level for each of the one or more remotely emplaced objects having the identification code based on the received signal quality.

10. The method of claim 9 , wherein the range signal for each of the remotely emplaced objects is transmitted at the minimum required power level.

11. The method of claim 1 , wherein the range for each of the one or more remotely emplaced objects relative to the reference source at the determined angular direction is based on a time of flight of the range and response signals.

12. The method of claim 11 , wherein the range for each of the one or more remotely emplaced objects relative to the reference source at the determined angular direction is further based on a known processing delay at the one or more remotely emplaced objects.

13. The method of claim 1 , wherein the response signal further includes a unique identity code.

14. The method of claim 10 , further comprising, subsequent to step (f), transmitting one or more commands to one or more of the one or more remotely emplaced objects at the minimum required power level.

15. The method of claim 2 , further comprising updating the map at predetermined intervals using the reference source.

16. The method of claim 1 , wherein the reference source comprises two or more reference sources and further comprising repeating steps (a)-(f) for each of the two or more reference sources.

17. The method of claim 16 , further comprising building a map of a position of the one or more remotely emplaced objects based on the determined angular direction and range for each of the one or more remotely emplaced objects for each of the two or more reference sources.

18. The method of claim 1 , further comprising sending the angular direction and range from the reference source for each of the one or more remotely emplaced objects to another of the one or more remotely emplaced objects.

19. The method of claim 1 , wherein the reference source signal is a polarized RF reference source signal.

20. The method of claim 19 , wherein the one or more orientation sensors comprise one or more polarized RF orientation sensors.

Assignees

• Rastegar Jahangir S
• Dhadwal Harbans
• Omnitek Partners L L C

Inventors

• Rastegar Jahangir S
• Dhadwal Harbans

Classifications

• G01S13/751

  wherein the responder or reflector radiates a coded signal · CPC title

• G01S13/88 Primary

  Radar or analogous systems specially adapted for specific applications (electromagnetic prospecting or detecting of objects, e.g. near-field detection, G01V3/00) · CPC title