Radar device and object detecting method for radar device

Patent metadata

Field	Value
Publication number	US-11378684-B2
Application number	US-202016893008-A
Country	US
Kind code	B2
Filing date	Jun 4, 2020
Priority date	Dec 28, 2017
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

Provided is a radar device including: a transmission circuit that transmits a first transmission signal and a second transmission signal which have frequencies different from each other; a reception circuit that receives the first transmission signal and the second transmission signal which are reflected by one or a plurality of objects as a first reception signal and a second reception signal, a processor, and a memory that stores a command group executable by the processor. Quadrature demodulation is performed with respect to each of the first reception signal and the second reception signal, at least one of the first reception signal and the second reception signal is rotated on an IQ plane in correspondence with a predetermined phase angle corresponding to a predetermined distance, and the first frequency or the second frequency, the first reception signal and the second reception signal of which one is rotated is added or subtracted, and the one or plurality of objects are detected on the basis of a processing result of a processing means.

First claim

The invention claimed is:

1. A radar device, comprising:
a transmission circuit configured to transmit at least a first transmission signal having a first frequency and a second transmission signal having a second frequency different from the first frequency;
a reception circuit configured to receive the first transmission signal and the second transmission signal, which are transmitted by the transmission circuit and are reflected by one or more objects, as a first reception signal and a second reception signal;
a memory that stores a predetermined distance to a particular object of the one or more objects; and
circuitry configured to
perform a quadrature demodulation with respect to each of the first reception signal and the second reception signal output from the reception circuit,
rotate at least one of the first reception signal and the second reception signal, which are subjected to the quadrature demodulation, on an IQ plane by a phase angle determined by multiplying a difference in waxen hers corresponding to the first and second frequencies by the predetermined distance stored in the memory,
add or subtract the first reception signal and the second reception signal, of which at least one is rotated,
detect the one or more objects based on a result of the addition or subtraction, and
output information relating to the detected one or more objects.

2. The radar device according to claim 1 , wherein the circuitry is further configured to add the first reception signal and the second reception signal, of which at least one is rotated, so as to highlight a predetermined object among the one or more objects.

3. The radar device according to claim 1 , wherein the circuitry is further configured to subtract the first reception signal and the second reception signal, of which at least one is rotated, so as to suppress a predetermined object among the one or more objects.

4. The radar device according to claim 2 ,
wherein the memory further stores information indicating a phase to be rotated with respect to each of the one or more objects,
wherein the circuitry is further configured to rotate a phase of at least one of the first reception signal and the second reception signal based on the stored information.

5. The radar device according to claim 1 ,
wherein the reception circuit is further configured to receive inflow signals of the first transmission signal and the second transmission signal from the transmission circuit to the reception circuit as the first reception signal and the second reception signal respectively,
the memory further stores information indicating a phase to be rotated with respect to the inflow signals, and
the circuitry is further configured to rotate a phase of at least one of the first reception signal and the second reception signal based on the information, and calculate a difference between the first reception signal and the second reception signal, of which at least one is rotated, so as to suppress the inflow signals.

6. The radar device according to claim 5 , wherein the reception circuitry is further configured to receive the first and second transmission signals, which are reflected from the one or more objects, which include a bumper of a vehicle.

7. The radar device according to claim 1 , wherein the transmission circuit is further configured to transmit a transmission signal that is a multi-peak type transmission signal in which a signal in a time region has a plurality of peaks.

8. The radar device according to claim 7 ,
wherein the transmission circuit is further configured to transmit the multi-peak type transmission signal, which has a Sinc function type waveform.

9. The radar device according to claim 1 , wherein the radar device is mounted on a vehicle,
the circuitry is further configured to output information obtained by executing processing of highlighting or suppressing a predetermined object among the one or more objects existing at a periphery of the vehicle to an electronic control device, and
the electronic control device is configured to change an operation of the vehicle.

10. A radar device, comprising:
a transmission circuit configured to transmit at least a first transmission signal having a first frequency and a second transmission signal having a second frequency different from the first frequency;
a reception circuit configured to receive the first transmission signal and the second transmission signal, which are transmitted by the transmission circuit and are reflected by one or more objects as a first reception signal and a second reception signal; and
circuitry configured to
perform a quadrature demodulation with respect to each of the first reception signal and the second reception signal output from the reception circuit;
rotate at least one of the first reception signal and the second reception signal, which are subjected to the quadrature demodulation, on an IQ plane by a phase angle;
add the first reception signal and the second reception signal, of which at least one is rotated, so as to highlight a predetermined object among the one or more objects;
and
output obtained information relating to the highlighted predetermined object.

11. An object detecting method for a radar device, comprising:
transmitting, by a transmission circuit, al least a first transmission signal having a first frequency and a second transmission signal having a second frequency different from the first frequency;
receiving, by a reception circuit, the first transmission signal and the second transmission signal, which are transmitted by the transmission circuit and are reflected by one or more objects, as a first reception signal and a second reception signal;
performing, by circuity, a quadrature demodulation with respect to each of the first reception signal and the second reception signal output from the reception circuit;
storing, in a memory, a predetermined distance to a particular object of the one or more objects;
rotating at least one of the first reception signal and the second reception signal, which are subjected to the quadrature demodulation, on an IQ plane by a phase angle determined by multiplying a difference in wavenumbers corresponding to the first and second frequencies by the predetermined distance stored in the memory;
adding or subtracting the first reception signal and the second reception signal, of which at least one is rotated;
detecting the one or more objects based on a processing result of the addition or subtraction; and
outputting information relating to the detected one or more objects.

Assignees

• Furukawa Electric Co Ltd
• Furukawa Automotive Systems Inc

Inventors

• Namiki Hajime
• Kobayashi Hiroyuki
• Otani Eisuke

Classifications

• G01S13/931 Primary

  of land vehicles · CPC title

• G01S7/282 Primary

  Transmitters · CPC title

• G01S13/24

  using frequency agility of carrier wave · CPC title

• B60R11/00

  Arrangements for holding or mounting articles, not otherwise provided for · CPC title

• G01S2013/93274

  on the side of the vehicles · CPC title