Patent ID: 7605745

Claim:
An on-vehicle radar device comprising: a transceiver which transmits/receives monitoring signals in a specified frequency band and transmits a priority order signal, which indicates priority order corresponding to order among on-vehicle radar devices at a frequency within the specified frequency band; and a controller which alternately switches the monitoring signals and the priority order signal transmitted by the transceiver, wherein the transceiver receives a priority order signal of another on-vehicle radar device, and the controller, in the case when interference with the signal of the other on-vehicle radar device is detected, following a preset rule shared by the other on-vehicle radar device, shifts the frequency band of the monitoring signal transmitted by the transceiver to a direction corresponding to the priority order of the on-vehicle radar device itself in relation to the priority order of the other on-vehicle radar device by a frequency width which is less than a width of the specified frequency band, and repeats shifting of the frequency band of the monitoring signal until the interference with the signal of the other on-vehicle device is not detected.