Controlling radar transmission to enable interference mitigation

Patent metadata

Field	Value
Publication number	US-9829566-B2
Application number	US-201414552505-A
Country	US
Kind code	B2
Filing date	Nov 25, 2014
Priority date	Nov 25, 2014
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

Radar detection of an object is achieved by identifying a first range associated with a possible object based on a first return from a first radar transmission having a first chirp rate, and identifying a second range associated with the possible object based on a second return from a second radar transmission having a second chirp rate that differs from the first chirp rate. The first and second ranges are evaluated together to determine whether the possible object is a true object.

First claim

What is claimed is:

1. A method for frequency modulated continuous wave radar detection of an object, comprising:
transmitting consecutively a first radar frame and a second radar frame at different chirp slopes and the same range resolutions;
receiving a first return frame from the first radar frame and a second return frame from the second radar frame;
determining peaks and ranges of the peaks in the first and second return frames;
comparing the ranges of the peaks in the first return frame to the ranges of the peaks in the second return frame to determine any match of ranges for any peaks; and
confirming a true object by peaks with matching ranges.

2. The method of claim 1 , in which the different chirp slopes are related by a factor α=0.9.

3. The method of claim 2 , in which the different chirp slopes are related by a factor α=0.85.

4. The method of claim 1 , including determining interferers with peaks at ranges that do not match between the first return frame and the second return frame.

5. The method of claim 1 in which the different chirp slopes are related by a factor α of about 0.9 to 0.85.

6. The method of claim 1 including:
determining interferers with peaks at ranges that do not match between the first return frame and the second return frame; and
including determining an amplitude of a peak of a true object by comparing amplitudes of the peaks of the true object and peaks of the interferers.

7. An apparatus for frequency modulated continuous wave radar detection of an object, comprising:
a transmitter transmitting consecutively a first radar frame and a second radar frame at different chirp slopes and the same range resolutions;
a receiver receiving a first return frame from the first radar frame and a second return frame from the second radar frame; and
logic coupled to said receiver and configured for evaluating the first and second frames together to determine whether the possible object is a true object, the logic determining peaks and ranges of the peaks in the first and second return frames, comparing the ranges of the peaks in the first return frame to the ranges of the peaks in the second return frame to determine any match of ranges for any peaks, and confirming a true object by peaks with matching ranges.

8. The apparatus of claim 7 , in which the different chirp slopes are related by a factor α=0.9.

9. The apparatus of claim 8 , in which the different chirp slopes are related by a factor α=0.85.

10. The apparatus of claim 7 , including determining interferers with peaks at ranges that do not match between the first return frame and the second return frame.

11. The apparatus of claim 7 in which the different chirp slopes are related by a factor α of about 0.9 to 0.85.

12. The apparatus of claim 7 in which the logic determines interferers with peaks at ranges that do not match between the first return frame and the second return frame; and determines an amplitude of a peak of a true object by comparing amplitudes of the peaks of the true object and peaks of the interferers.

13. A process of identifying power supply interferers and true objects in a frequency modulated continuous wave radar system, comprising:
(a) transmitting consecutively a first radar frame and a second radar frame at different chirp slopes and the same range resolutions;
(b) receiving a first return frame from the first radar frame and a second return frame from the second radar frame;
(c) determining peaks, and ranges of the peaks, in the first and second return frames;
(d) comparing the ranges of the peaks in the first return frame to the ranges of the peaks in the second return frame to determine any match of ranges for any peaks;
(e) confirming interferer peaks by peaks with different ranges in the first and second return frames; and
(f) confirming a true object by peaks with matching ranges in the first and second return frames.

14. The process of claim 13 including determining an amplitude of a peak of a true object by comparing amplitudes of the peaks of the true object and peaks of the interferers.

15. The process of claim 13 in which the different chirp slopes are related by a factor α of about 0.9 to 0.85.

Assignees

• Texas Instruments Inc

Inventors

• Rao Sandeep
• Subburaj Karthik

Classifications

• G01S13/931

  of land vehicles · CPC title

• G01S13/38

  wherein more than one modulation frequency is used · CPC title

• G01S13/34 Primary

  using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal · CPC title

• G01S13/583

  using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets · CPC title

• G01S7/023 Primary

  Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques (auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36) · CPC title