Radar apparatus

Patent metadata

Field	Value
Publication number	US-11112486-B2
Application number	US-201916450444-A
Country	US
Kind code	B2
Filing date	Jun 24, 2019
Priority date	Dec 27, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

Disclosed is a radar apparatus including: a local oscillator for outputting a local oscillation signal; a transmitter unit; and a receiver unit. The transmitter unit includes: a transmission input configured to receive the local oscillation signal; and a transmitter configured to transmit a transmission signal based on the local oscillation signal that has been received via the transmission input. The receiver unit includes: a reception input configured to receive the local oscillation signal not via the transmission input; a receiver configured to receive a reflection wave based on the transmission signal; a cancel signal generator configured to generate a cancel signal based on the local oscillation signal that has been received via the reception input; and an adder configured to superimpose the cancel signal on a reception signal.

First claim

What is claimed is:

1. A radar apparatus which includes: a local oscillator for outputting a local oscillation signal; a transmitter unit; and a receiver unit, wherein
the transmitter unit includes:
a transmission input configured to receive the local oscillation signal; and
a transmitter configured to transmit a transmission signal based on the local oscillation signal that has been received via the transmission input,

the receiver unit includes:
a reception input configured to receive the local oscillation signal not via the transmission input;
a receiver configured to receive a reflection wave based on the transmission signal;
an IQ generation circuit which receives the local oscillation signal as an input, the IQ generation circuit configured to generate first and second local oscillation signals having a phase difference of 90 degrees;
a cancel signal generator configured to generate a cancel signal by amplifying the first and second local oscillation signals based on an adjustment signal and then adding the amplified first and second local oscillation signals;
an adder configured to perform superimposition of the cancel signal on a reception signal; and:
a mixer configured to perform frequency conversion using the first and second local oscillation signals by receiving an output from the adder.

2. The radar apparatus of claim 1 , wherein the cancel signal includes a plurality of cancel signals, and the cancel signal generator adjusts an amplitude of each of cancel signals I and Q among the cancel signals, the cancel signal I being based on the first local oscillation signal, the cancel signal Q having a phase difference of 90 degrees from the cancel signal I and being based on the second local oscillation signal.

3. The radar apparatus of claim 1 , wherein a frequency of the local oscillation signal is modulated.

4. The radar apparatus of claim 3 , wherein the cancel signal generator adjusts the cancel signal in accordance with frequency information of the local oscillation signal.

5. The radar apparatus of claim 1 , wherein the receiver includes a low noise amplifier, and the adder performs the superimposition in a preceding stage of the low noise amplifier.

6. The radar apparatus of claim 1 , further comprising:
at least one transmitter circuit having a same configuration as the transmitter unit; and a plurality of receiver circuits each having a same configuration as the receiver unit.

7. The radar apparatus of claim 6 , wherein all circuits are formed in one package.

8. The radar apparatus of claim 7 , wherein the plurality of receiver circuits have reception antennas, and the reception antennas are planar antennas arranged on a package substrate.

9. A radar apparatus which includes: a local oscillator for outputting a local oscillation signal; at least one transmitter circuit; and a plurality of receiver circuits, wherein
the at least one transmitter circuit includes:
a transmission input configured to receive the local oscillation signal; and
a transmitter configured to transmit a transmission signal based on the local oscillation signal that has been received via the transmission input,

each of the receiver circuits includes:
a reception input configured to receive the local oscillation signal not via the transmission input;
a receiver configured to receive a reflection wave based on one of the transmission signals;
an IQ generation circuit which receives the local oscillation signal as an input, the IQ generation circuit configured to generate first and second local oscillation signals having a phase difference of 90 degrees
a cancel signal generator configured to generate a cancel signal by amplifying the first and second local oscillation signals based on an adjustment signal and then adding the amplified first and second local oscillation signals;
an adder configured to perform superimposition of the cancel signal on a reception signal; and
a mixer configured to perform frequency conversion using the first and second local oscillation signals by receiving an output from the adder.

10. The radar apparatus of claim 9 , wherein the cancel signal includes a plurality of cancel signals, and the cancel signal generator adjusts an amplitude of each of cancel signals I and Q among the cancel signals, the cancel signal I being based on the first local oscillation signal, the cancel signal Q having a phase difference of 90 degrees from the cancel signal I and being based on the second local oscillation signal.

11. The radar apparatus of claim 9 , wherein a frequency of the local oscillation signal is modulated.

12. The radar apparatus of claim 11 , wherein the cancel signal generator adjusts the cancel signal in accordance with frequency information of the local oscillation signal.

13. The radar apparatus of claim 9 , wherein the receiver includes a low noise amplifier, and the adder performs the superimposition in a preceding stage of the low noise amplifier.

14. The radar apparatus of claim 9 , wherein all circuits are formed in one package.

15. The radar apparatus of claim 14 , wherein the plurality of receiver circuits have reception antennas, and the reception antennas are planar antennas arranged on a package substrate.

Assignees

• Socionext Inc

Inventors

• Hayashi Joji

Classifications

• G01S7/028 Primary

  Miniaturisation, e.g. surface mounted device [SMD] packaging or housings · CPC title

• H04B1/408

  the transmitter oscillator frequency being identical to the receiver local oscillator frequency · CPC title

• G01S7/358

  using I/Q processing · CPC title

• G01S7/4021

  of receivers · CPC title

• G01S7/032

  Constructional details for solid-state radar subsystems · CPC title