Patent ID: 7498971

Claim:
An in-vehicle radar device that attaches to a vehicle and includes a radar device body including a oscillator that outputs a high-frequency signal, a radio wave transmitting antenna that transmits, as a radio wave, the high-frequency signal that the oscillator has outputted, an array antenna comprising plural element antennas for receiving the radio wave, emitting means that controls a transmission timing of the radio wave, mixers that down-convert the received waves received by the plural element antennas and retrieve beat signals, and a signal processing unit that performs calculation for determining the phase of each of the element antennas from the beat signals and retrieving position information of a target in front of the vehicle, the in-vehicle radar device comprising: phase storing means that prestores the phase of the received wave incoming secondarily from outside the target; received wave importing means that imports the received wave on the basis of a radio wave reception timing determined by the transmission timing of the radio wave; phase detecting means that determines the phase of the received wave imported by the received wave importing means; phase correction amount extracting means that compares the phase prestored by the phase storing means with the phase detected by the phase detecting means and extracts and stores a phase correction amount of each of the element antennas; and phase correcting means that corrects the phase of a received signal of each of the element antennas on the basis of the phase correction amounts obtained by the phase correction amount extracting means.