Patent ID: 7248209

Claim:
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.