Controlling Radar Transmission to Enable Interference Mitigation

Patent metadata

Field	Value
Publication number	US-2016146933-A1
Application number	US-201414552505-A
Country	US
Kind code	A1
Filing date	Nov 25, 2014
Priority date	Nov 25, 2014
Publication date	May 26, 2016
Grant date	—

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 radar detection of an object, comprising:
identifying a first range associated with a possible object based on a first return from a first radar transmission having a first chirp rate; 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; and evaluating the first and second ranges together to determine whether the possible object is a true object.

2 . The method of claim 1 , wherein said evaluating includes comparing the first and second ranges.

3 . The method of claim 2 , wherein a true object is determined if the first and second ranges are the same.

4 . The method of claim 1 , wherein the first and second radar transmissions are consecutive transmissions.

5 . The method of claim 4 , wherein one of the first and second chirp rates is approximately 90% of the other of the first and second chirp rates.

6 . The method of claim 4 , wherein one of the first and second radar transmissions has a chirp duration selected such that said one of the first and second radar transmissions provides a same range resolution as the other of the first and second radar transmissions.

7 . An apparatus for radar detection of an object, comprising:
a receiver configured for 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 for 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; and logic coupled to said receiver and configured for evaluating the first and second ranges together to determine whether the possible object is a true object.

8 . The apparatus of claim 7 , wherein said evaluating includes comparing the first and second ranges.

9 . The apparatus of claim 8 , wherein a true object is determined if the first and second ranges are the same.

10 . The apparatus of claim 7 , wherein the first and second radar transmissions are consecutive transmissions.

11 . The apparatus of claim 10 , wherein one of the first and second chirp rates is approximately 90% of the other of the first and second chirp rates.

12 . The apparatus of claim 10 , wherein one of the first and second radar transmissions has a chirp duration selected such that said one of the first and second radar transmissions provides a same range resolution as the other of the first and second radar transmissions.

13 . The apparatus of claim 7 , provided as a frequency modulated continuous wave radar apparatus.

14 . A radar apparatus, comprising:
a radar signal generator configured to produce first and second radar signals having respective first and second chirp rates that differ from one another and having respective first and second chirp durations that differ from one another; and a selector coupled to said radar signal generator and configured to select, based on transmit timing of the radar apparatus, said first and second radar signals for use in first and second consecutive radar transmissions, respectively.

15 . The apparatus of claim 14 , wherein one of the first and second chirp rates is approximately 90% of the other of the first and second chirp rates.

16 . The apparatus of claim 14 , wherein the first and second radar transmissions have a same range resolution.

17 . The apparatus of claim 14 , wherein each of the first and second radar transmissions consists of one chirp.

18 . The apparatus of claim 14 , wherein each of the first and second radar transmissions includes a plurality of chirps.

19 . The apparatus of claim 14 , including a receiver configured for identifying a first range associated with a possible object based on a first return from the first radar transmission, and for identifying a second range associated with the possible object based on a second return from the second radar transmission, and logic coupled to said receiver and configured for evaluating the first and second ranges together to determine whether the possible object is a true object.

20 . The apparatus of claim 14 , provided as a frequency modulated continuous wave radar apparatus.

Assignees

• Texas Instruments Inc

Inventors

• Rao Sandeep
• Subburaj Karthik

Classifications

• 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

• G01S13/282 Primary

  using a frequency modulated carrier wave (G01S13/286 takes precedence) · CPC title

• G01S7/023

  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

• G01S7/28

  Details of pulse systems · CPC title

• G01S7/354

  Extracting wanted echo-signals (Doppler systems G01S13/50) · CPC title