Patent ID: 8334800

Claim:
An on-vehicle radar device, comprising: frequency modulating means for modulating a frequency of a transmission signal by a triangular wave; transmitting means for pulsing the frequency modulated transmission signal to transmit the pulsed transmission signal as a transmission pulse to a target; receiving means for receiving a signal reflected by the target as a received pulse to generate a beat signal based on a frequency difference between a part of the frequency modulated transmission signal and the received pulse; range gate setting means for setting a range gate that determines a sampling timing of the received pulse based on a transmitting timing of the transmission pulse; sampling means for sampling the beat signal in each of set range gates; distance and relative velocity calculating means for calculating a distance to the target and a relative velocity of the target based on the sampled beat signal; and control means for controlling the frequency modulating means, the transmitting means, and the range gate setting means to change a transmission pulse width and a range gate width depending on a subject vehicle velocity acquired from vehicle velocity detecting means at a timing of the frequency modulation.