US 7,248,209 B2Granted

Radar apparatus

AssigneeFujitsu Ten Limited

InventorsNobukazu Shima, Osamu Isaji

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Abstract

The present invention relates to a radar apparatus that uses a plurality of transmitting/receiving antennas A1-A4 and receives a reflected wave, of a transmitted wave, reflected from a target. By utilizing the property that the path of the transmitted wave from an antenna A1 and its reflected wave and the path of the transmitted wave from the next selected antenna A2 and its reflected wave share the same spatial system, and therefore that both received signals have the same characteristics in terms of frequency and phase, a judgment is made as to whether there exists any difference between the receiving characteristics of the antennas, and the received signal is corrected in accordance with the result of the judgment. It is also possible to judge the presence or absence of a change in the characteristic of each antenna, and apply a correction accordingly, even during the normal operation of the apparatus.

Claims18

Dependent claims

A radar apparatus comprising:

a plurality of antennas, each switchable between transmission and reception;
and
a signal processing unit for receiving a reflected wave of a transmitted radiowave reflected from a target object, and for generating a processing signal based on the received signal and thereby performing a recognition process which involves detecting an azimuth relating to the reflected wave or measuring a range or velocity relating to the target object, wherein
when a reflected wave of a radiowave transmitted from a first selected one of the antennas is received by a second selected antenna, the signal processing unit generates a first processing signal based on the received signal, and when a reflected wave of a radiowave transmitted from the second selected antenna is received by the first selected antenna, the signal processing unit generates a second processing signal based on the received signal, and compares the first processing signal with the second processing signal and thereby makes a judgment about a change in a characteristic of the received signal based on an amplitude difference and/or a phase difference between the two processing signals.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 11/146,329Filed 6 Jun 2005
Priority: JP 2004-17679115 Jun 2004
Published: US 2005/0275585 A115 Dec 2005
Granted: 24 Jul 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01S 7/4008
Of parts of a radar system: of transmitters
G01S 7/4021
Of parts of a radar system: of receivers
G01S 7/4056
By simulation of echoes: specially adapted to FMCW
G01S 13/583
Velocity or trajectory determination systems; Sense-of-movement determination systems: using transmission of continuous unmodulated waves,…