Patent ID: 6396437
Filing Date: 2002-05-28
Classification: G01S,H01Q

Abstract:
A multibeam radar velocity sensor mounted to a vehicle and comprising:means for generating a radar signal; a first plurality of transmitting antennas associated with a Doppler shift measurement; a second plurality of transmitting antennas associated with a time-correlation measurement; a first multiple pole switch connected between the generating means and the first and second antennas for sequentially transmitting a plurality of radar beams in predetermined patterns; a first plurality of receiving antennas corresponding in number to those of the first transmitting antennas; a second plurality of receiving antennas corresponding in number to those of the second transmitting antennas; first means for mixing the signals sequentially received by the first plurality of receiving antennas with a signal from the generating means; a second multiple pole switch ganged to the first switch for sequentially switching the signals from the first plurality of receiving antennas to the first mixing means; processing means connected to the output of the mixing means for computing the Doppler shift between the mixed sequentially received signals and calculating velocity therefrom; second means for mixing the signals sequentially received by the second plurality of receiving antennas with a signal from the generating means; the second multiple pole switch also switching the signals from the second plurality of receiving antennas to an input of the second mixing means; the processing means also connected to the output of the second mixing means for performing a time-correlation computation on the signals sequentially received from the second receiving antennas and calculating velocity therefrom, independent from the velocity calculation from the Doppler shift measurement.