Method, system and device for radar based high resolution object detection

• US 10,281,575 B2
• Filed: 12/01/2016
• Issued: 05/07/2019
• Est. Priority Date: 09/27/2016
• Status: Active Grant

• Current Assignee: Steradian Semiconductors Private Limited (Renesas Electronics Corporation)
• Original Assignee: Steradian Semiconductors Private Limited (Renesas Electronics Corporation)
• Inventors: Rajendran, Gireesh, Sivadas, Apu
• Primary Examiner(s): Bythrow, Peter M
• Application Number:
  US15/365,984
• Publication Number:
  US 20180088229A1
• Time in Patent Office: 887 Days
• CPC Class Codes: G01S 13/18 wherein range gates are used
• CPC Class Codes: G01S 13/582 adapted for simultaneous range and velocity measurements
• CPC Class Codes: G01S 13/89 for mapping or imaging
• CPC Class Codes: G01S 7/285 Receivers

Abstract

In an embodiment of the present disclosure, a Radar transceiver for object detection comprises a two dimensional antenna array receiving plurality of a reflected radio frequency (RF) signals, a mux-adder selectively adding the reflected RF signals in first mode and selectively multiplexing the reflected RF signals in a second mode, a range bin detector determining a valid range bins in the first mode and a three dimensional (3D) image reconstructor operating on the valid range bins to reconstruct a 3D image of the object in the second mode. In that the two dimensional antenna array comprises antenna elements arranged in K rows and M columns, and the mux-adder adds a RF signal received on the M columns of each row in the first mode. The mux-adder multiplexes the RF signal received on the M columns of each row in the second mode.

Claims

1. A Radar transceiver for an object detection comprising:

a two dimensional antenna array receiving plurality of a reflected radio frequency (RF) signals;

a mux-adder selectively adding the reflected RF signals in a first mode and selectively multiplexing the reflected RF signals in a second mode;

a range bin detector determining a valid range bins and velocity in the first mode; and

a three dimensional (3D) image reconstructor operating on the valid range bins to reconstruct a 3D image of the object in the second mode.

2. The radar transceiver of claim 1, wherein the two dimensional antenna array comprising antenna elements arranged in K rows and M columns, and the mux-adder adds a RF signal received on the M columns of an each row in the first mode.

3. The radar transceiver of claim 2, wherein the mux-adder multiplexes the RF signal received on the M columns of each row in the second mode.

4. The radar transceiver of claim 3, further comprising K number of circuit blocks each for adding corresponding RF signals received on the K rows in the first mode and multiplexing in the second mode.

5. The radar transceiver of claim 4, wherein the first mode is operative over a first chirp and the second mode is operative over M chirps.

6. The radar transceiver of claim 5, further comprising K number of RF receivers each converting the RF signal from the K number of circuit blocks to a digital data sequence.

7. The radar transceiver of claim 6, wherein the 3D image reconstructor comprises a high speed narrow band filter operative over the valid range bins.

8. The radar transceiver of claim 7, wherein the high speed narrow band filter extract a valid spectrum of the object using a relation:

9. The radar transceiver of claim 8, wherein the range bin detector determine the valid range bins by employing a one dimensional Fast Fourier transform.

10. A method in a Radar transceiver comprising:

receiving plurality of a reflected radio frequency (RF) signals;

selectively adding the reflected RF signals in a first mode and selectively multiplexing the reflected RF signals in a second mode;

determining a valid range bins and velocity in the first mode; and

operating on the valid range bins to reconstruct a 3D image of an object in the second mode.

11. The method of claim 10, wherein the plurality of the reflected RF signal is received through a two dimensional antenna array comprising antenna elements arranged in K rows and M columns, and adding a RF signal received on the M columns of each row in the first mode.

12. The method of claim 11, further comprising multiplexing the RF signal received on the M columns of each row in the second mode.

13. The method of claim 12, further comprising adding corresponding RF signals received on the K rows in the first mode and multiplexing in the second mode.

14. The method of claim 13, further comprising operating over a first chirp in the first mode and operating over M chirps in the second mode.

15. The method of claim 14, further comprising converting the RF signal from K number of circuit blocks to a digital data sequence.

16. The method of claim 15, further comprising extracting a valid spectrum of the object using a relation:

17. The method of claim 16, further comprising determining the valid range bins by employing a one dimensional Fast Fourier transform.