Patent ID: 6753805
Filing Date: 2004-06-22
Classification: G01S

Abstract:
A radar system comprising:a transmitting/receiving unit for transmitting a transmitting signal changing in a triangular waveform so that a frequency-gradually-rising up-modulating interval and a frequency-gradually-dropping down-modulating interval are temporally repeated and for receiving a reception signal including a reflected signal from a target; a scanning unit for changing the beam bearing of the transmitting signal for predetermined bearing angles; a frequency-analyzing unit for determining data on the frequency spectrum of a beat signal representing a frequency difference between the transmitting signal and the reception signal; a detection unit for detecting, based on the frequency of the beat signal in the up-modulating interval and the frequency of the beat signal in the down-modulating interval, at least one of a relative distance to the target and a relative speed thereof; and a checking unit in which, peak groups each including consecutive peaks appearing in the frequency spectrum in the beam bearings within a predetermined frequency difference are regarded as being caused by waves reflected by a single target, and said checking unit performs checking, in pairs, of each peak group in the up-modulating interval and each peak group in the down-modulating interval; wherein the predetermined frequency difference corresponds to a distance in which the single target can move in a scanning time for one beam.