Method to resolve interfering targets jointly at multiple dimensions

Patent metadata

Field	Value
Publication number	US-10401485-B2
Application number	US-201615365298-A
Country	US
Kind code	B2
Filing date	Nov 30, 2016
Priority date	Nov 30, 2016
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

A system and method for resolving a first target from a second target by radar is disclosed. The system includes a transmitter for transmitting a source signal, a receiver for receiving first and second echo signals from reflection of the source signal from at least a first target and a second target, respectively. A processor is used to subtract the first echo signal from the composite signal to obtain a second generation of the second echo signal, subtract the second generation of the second echo signal from the composite signal to obtain a second generation of the first echo signal, and estimate a parameter value for the first target from the second generation of the first echo signal and a parameter value for the second target from the second generation of the second echo signal.

First claim

What is claimed is:

1. A method of resolving a first target from a second target in a radar system, comprising:
obtaining a composite signal including a first echo signal obtained by reflection of a source signal of the radar system from the first target and a second echo signal obtained by reflection of the source signal from the second target;
subtracting the first echo signal from the composite signal to obtain a second generation of the second echo signal;
subtracting the second generation of the second echo signal from the composite signal to obtain a second generation of the first echo signal; and
estimating a parameter value for the first target from the second generation of the first echo signal and a parameter value for the second target from the second generation of the second echo signal.

2. The method of claim 1 , wherein subtracting the first echo signal further comprises identifying the first echo signal in the composite signal, creating a signal representative of the first echo signal and subtracting the signal representative of the first echo signal from the composite signal to obtain the second generation of the second echo signal.

3. The method of claim 2 , wherein subtracting the second generation of the echo signal further comprises creating a signal representative of the second echo signal and subtracting the signal representative of the second echo signal from the composite signal to obtain the second generation of the first echo signal.

4. The method of claim 3 , wherein the signal representative of the first echo signal and the signal representative of the second echo signal are sinc functions.

5. The method of claim 3 , wherein constructing the signal representative of the first echo signal and the signal representative of the second echo signal further comprises performing a convolution of a delta function having the parameter values of peaks of the first and second echo signals, respectively.

6. The method of claim 1 , further comprising iterating the process of subtracting peaks to obtain a subsequent generation of peaks.

7. The method of claim 6 , further comprising continuing the iteration until a difference between a parameter value for a current generation of an echo signal and a parameter value for a previous generation of the echo signal is less than a selected threshold value.

8. The method of claim 1 , further comprising driving a vehicle using at least one of: (i) the parameter value for the first target obtained from the second generation of the first echo signal; and (ii) the parameter value for the second target obtained from the second generation of the second echo signal.

9. A radar system, comprising:
a transmitter for transmitting a source signal;
a receiver for receiving echo signals from reflection of the source signal from at least a first target and a second target; and
a processor configured to:
obtain a composite signal including a first echo signal representative of the first target and a second echo signal representative of the second target;
subtract a signal representative of the first echo signal from the composite signal to generate of a second generation of the second echo signal;
subtract a signal representative of the second generation of the second echo signal from the composite signal to obtain a second generation of the first echo signal; and
estimate a parameter value for the first target from the second generation of the first echo signal and a parameter value for the second target from the second generation of the second echo signal.

10. The radar system of claim 9 , wherein the processor is further configured to identify the first echo signal in the composite signal, create a signal representative of first echo signal and subtract the signal representative of the first echo signal from the composite signal to obtain the second generation of the second echo signal.

11. The radar system of claim 10 , wherein the processor is further configured to create a signal representative of the second echo signal and to subtract the signal representative of the second echo signal from the composite signal to obtain the second generation of the first echo signal.

12. The radar system of claim 11 , wherein the signal representative of the first echo signal and the signal representative of the second echo signal are sinc functions.

13. The radar system of claim 11 , wherein creating the signal representative of the first echo signal and the signal representative of the second echo signal further comprises performing a convolution of a delta function having the parameter values of peaks of the first and second echo signals, respectively.

14. The radar system of claim 9 , wherein the processor is further configured to iterate the process of subtracting echo signals to obtain a subsequent generation of echo signals.

15. The radar system of claim 14 , wherein the processor is further configured to continue the iteration until a difference between a parameter value for a current generation of an echo signal and a parameter value for a previous generation of the echo signal is less than a selected threshold value.

16. The radar system of claim 9 , further comprising a collision-avoidance device for driving a vehicle using at least one of: (i) the parameter value for the first target obtained from the second generation of the first echo signal; and (ii) the parameter value for the second target obtained from the second generation of the second echo signal.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Bilik Igal
• Pokrass Alexander
• Bialer Oded

Classifications

• G01S2013/93271

  in the front of the vehicles · CPC title

• G01S13/726

  Multiple target tracking · CPC title

• G01S13/584

  adapted for simultaneous range and velocity measurements · CPC title

• G01S13/582

  adapted for simultaneous range and velocity measurements · CPC title

• G01S13/343

  using sawtooth modulation · CPC title