Multistatic radar measurement

Patent metadata

Field	Value
Publication number	US-12196839-B2
Application number	US-202318328256-A
Country	US
Kind code	B2
Filing date	Jun 2, 2023
Priority date	Dec 6, 2019
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for multistatic radar communications. In some implementations, a transmitting device may transmit, to a receiving device, a radar alert frame followed by a codeword and one or more radar pulses. The radar pulses are transmitted, using beamforming, in a number of directions. The timing information indicates a timing offset or delay between one or more codewords of the codeword sequence and the beginning of the radar pulses. The receiving device may detect one or more codewords of the codeword sequence and an echo of at least one of the radar pulses, and determine the time at which the corresponding pulse was transmitted by the transmitting device. The receiving device may compare the timing of the echo with the timing of the transmitted pulse to determine a relative distance of an object that produced the echo.

First claim

What is claimed is:

1. An apparatus for wireless communication at a first wireless communication device, comprising:
a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the apparatus to:
receive, from a second wireless communication device, a codeword;
receive, from a second wireless communication device, one or more first pulses at a first time; and
receive an echo of a pulse of one or more second pulses at a second time, wherein a distance of an object to the first wireless communication device is identified in accordance with the first time and the second time.

2. The apparatus of claim 1 , wherein, to receive the codeword, the processing system is configured to cause the apparatus to:
tune a plurality of antennas of the first wireless communication device in a direction of the second wireless communication device.

3. The first wireless communication device of claim 1 , wherein, to receive the echo, the processing system is configured to cause the apparatus to:
cause a plurality of antennas of the first wireless communication device to be positioned in a plurality of directions.

4. The first wireless communication device of claim 1 , wherein the processing system is further configured to cause the apparatus to:
transmit feedback to the second wireless communication device responsive to detecting the echo, the feedback indicating the second time.

5. The first wireless communication device of claim 1 , wherein the processing system is further configured to cause the apparatus to:
receive, from a second wireless communication device, a radar alert frame carrying timing information indicating a timing relationship between the codeword and the one or more second pulses.

6. The first wireless communication device of claim 5 , wherein the one or more second pulses comprises a sequence of pulses and the timing information indicates a duration of each of the one or more pulses and a delay between the codeword and a beginning of the sequence of pulses.

7. The first wireless communication device of claim 5 , wherein the processing system is further configured to cause the apparatus to:
calculate a time at which the pulse is transmitted in accordance with the second time and the timing information; and
estimate a range of distances associated with the object in accordance with the second time and the calculated time.

8. The first wireless communication device of claim 7 , wherein the processing system is further configured to cause the apparatus to:
transmit feedback to the second wireless communication device responsive to detecting the echo, the feedback indicating the estimated range of distances.

9. The first wireless communication device of claim 7 , wherein, to determine of the distance of the object, the processing system is configured to cause the apparatus to:
determine an angle of arrival of the echo at the first wireless communication device; and
calculate the distance of the object in accordance with the angle of arrival and the estimated range of distances.

10. An apparatus for wireless communications at a wireless communication device, comprising:
a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the apparatus to:
transmit a codeword and one or more first pulses, using beamforming, in a direction of a first receiving device;
transmit one or more second pulses, using beamforming, in a plurality of directions; and
receive feedback from the first receiving device responsive to the transmission of the one or more second pulses, wherein a distance of an object to the wireless communication device is identified in accordance with the feedback received from the first receiving device.

11. The wireless communication device of claim 10 , wherein, to determine of the distance of the object, the processing system is configured to cause the apparatus to:
determine, based on the feedback, a time at which an echo of a first pulse of the one or more second pulses is detected by the first receiving device;
determine an angle of departure of the first pulse at the wireless communication device; and
calculate the distance of the object in accordance with the angle of departure and the time at which the echo is detected by the first receiving device.

12. The wireless communication device of claim 10 , wherein the processing system is further configured to cause the apparatus to:
transmit, to the first receiving device, a radar alert frame carrying timing information indicating a timing relationship between the codeword and one or more second pulses.

13. The wireless communication device of claim 12 , wherein the one or more second pulses comprises a sequence of pulses and the timing information indicates a duration of each of the one or more second pulses and a delay between the transmission of the codeword and a beginning of the sequence of pulses.

14. The wireless communication device of claim 10 , the processing system is further configured to cause the apparatus to:
transmit a second radar alert frame carrying timing information to a second receiving device;
transmit a second codeword, using beamforming, in a direction of the second receiving device; and
receive feedback from the second receiving device responsive to the transmission of the one or more second pulses.

15. The wireless communication device of claim 14 , wherein, to determine of the distance of the object, the processing system is configured to cause the apparatus to:
determine, based on the feedback received from the first receiving device, a time at which an echo of a first pulse of the one or more second pulses is detected by the first receiving device; and
determine, based on the feedback received from the second receiving device, a time at which an echo of a second pulse of the one or more second pulses is detected by the second receiving device, the distance of the object being determined based on the time at which the echo of the first pulse is detected by the first receiving device and the time at which the echo of the second pulse is detected by the second receiving device.

16. The wireless communication device of claim 15 , wherein the feedback received from the first receiving device indicates a first range of distances associated with the object and the feedback received from the second receiving device indicates a second range of distances associated with the object.

17. A method for wireless communications at a first wireless communication device, comprising:
receiving, from a second wireless communication device, a codeword;
receiving, from a second wireless communication device, one or more first pulses at a first time; and
receiving an echo of a pulse of one or more second pulses at a second time, wherein a distance of an object to the first wireless communication device is identified in accordance with the first time and the second time.

18. The method of claim 17 , wherein the receiving the codeword comprises:
tuning a plurality of antennas of the first wireless communication device in a direction of the second wireless communication device.

19. The method of claim 17 , wherein the receiving the echo comprises:
causing a plurality of antennas of the first wireless communication device to be positioned in a plurality of directions.

20. The method of claim 17 , further com

Assignees

• Qualcomm Inc

Inventors

• Trainin Solomon
• Kasher Assaf
• Eitan Alecsander
• Sagi Ariel

Classifications

• G01S13/325

  using transmission of coded signals, e.g. P.S.K. signals · CPC title

• G01S2013/466

  by Trilateration, i.e. two antennas or two sensors determine separately the distance to a target, whereby with the knowledge of the baseline length, i.e. the distance between the antennas or sensors, the position data of the target is determined · CPC title

• G01S13/10

  using transmission of interrupted, pulse modulated waves (determination of distance by phase measurement G01S13/32) · CPC title

• G01S13/42

  Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S13/46) · CPC title

• G01S7/006

  using shared front-end circuitry, e.g. antennas (G01S13/765, G01S13/825 take precedence) · CPC title