Patent ID: 6292129
Filing Date: 2001-09-18
Classification: G01S

Abstract:
A radar apparatus comprising:a transmitter producing a transmit signal which is so modulated in frequency as to change with time cyclically and transmitting the transmit signal as a radar wave;a plurality of receiving antennas each receiving a return of the radar wave from an object present in a radar detectable zone to produce an input signal;a receiver including a receiver switch, a switching control circuit, and a receiving circuit, the receiver switch selectively establishing communication between one of said receiving antennas and the receiving circuit, the switching control circuit controlling an operation of the receiver switch so as to change the communications between said receiving antennas and the receiving circuit in sequence in a cycle shorter than a cycle of a change in the frequency of the transmit signal to supply a series of signal components of the input signals produced by said receiving antennas to the receiving circuit, the receiving circuit mixing the series of signal components with a local signal having the same frequency as that of the transmit signal to produce a beat signal; anda signal processor sampling the beat signal produced by said receiver to analyze frequency components of the beat signal.