Patent ID: 6972710

Claim:
An automotive radio wave radar in which a radio wave is radiated from a transmit antenna forward of a relevant vehicle, a reflected radio wave from a vehicle running ahead or other object is received by a receive antenna, and at least a position or a rate of the vehicle running ahead relative to the relevant vehicle is computed, said radar comprising: oscillation device for oscillating a radio wave to be transmitted while changing a frequency of the transmitted radio wave at a certain time interval; and signal processing device for detecting an abnormality of a received signal based on signals obtained by receiving radio waves transmitted at different frequencies, wherein said radar is of the type radiating a radio wave modulated about a certain center frequency from said transmit antenna, said oscillation means oscillates the radio wave to be transmitted while changing a center frequency of the transmitted radio wave to different frequencies at a certain time interval; and signal processing means computes position information of the vehicle running ahead for each of the center frequencies of the radio waves transmitted from said oscillation means.