Patent ID: 7843381

Claim:
A radar device of FM pulse system including: frequency modulation means for making a frequency modulation of a frequency of a transmission radio wave with a modulation signal of a triangular wave; transmission means for generating a pulsed signal of which frequency has been modulated by said frequency modulation means, and transmitting the pulsed signal to a target as a transmission pulse signal; receiving means for receiving a signal having been reflected at said target as a received pulse signal, and generating a beat signal from a frequency difference between a part of the transmission radio wave of which frequency has been modulated and the received pulse signal; and distance and relative velocity calculation means for calculating a distance to said target and a relative velocity with the beat signal generated by said receiving means; the radar device comprising: range gate setting means for setting a range gate that determines a sampling timing of said received pulse signal at intervals of a predetermined time period based on a transmission timing of said transmission pulse signal; sampling means for sampling said received pulse signal in a frequency up zone or in a frequency down zone of said frequency modulated signal in each range gate set by the mentioned range gate setting means; and measurement time changing means for setting a measurement data used as an input of Fourier transform based on sampling data obtained by said sampling means, and when a time period for sampling of all measurement data is a measurement time period, changing said measurement time period in each range gate.