On-vehicle radar device and on-vehicle radar device control system

An on-vehicle radar device comprising:

• a transceiver which transmits/receives monitoring signals in a specified frequency band and transmits a priority order signal at a frequency within the 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 modulates, by the specified frequency band, the frequency of the monitoring signal to be transmitted and alternately sets the frequency of the priority order signal to be transmitted at the center frequency of the modulation frequency, at the maximum frequency thereof, or at the minimum frequency thereof;
• and
• the controller, in the case when interference with the signal of the other on-vehicle radar device is detected, based on the priority order of the other device and the priority order of the device itself, shifts, by a specified frequency, the frequency band of the monitoring signal transmitted by the transceiver, and
• the shift width of the frequency band of the monitoring signal is determined based on the frequency of the priority order signal received from the other on-vehicle radar device.

An on-vehicle radar device comprising:

• a transceiver which transmits a monitoring signal in a specified frequency band;
• a controller which repeats alternately a transmission period of a specified length during which the monitoring signal is transmitted by the transceiver and a pause period of a specified length during which no monitoring signal is transmitted by the transceiver;
• a position-information acquiring unit which acquires a position of the device itself;
• and
• a communication unit which communicates with a control center, wherein
• the communication unit transmits to the control center position information of the device itself and a priority order thereof, and
• the control center, based on the position information received from the on-vehicle radar device, obtains a distance between the on-vehicle radar device and other on-vehicle radar device, and in the case that other on-vehicle radar device exists within a range of a specified distance, based on the priority orders of the devices, transmits an instruction to shift the transmission period or the monitoring-signal frequency band, and
• the controller changes transmission period or the monitoring-signal frequency band following the instruction received from the control center.

An on-vehicle radar device control system comprising:

• a plurality of on-vehicle radar devices;
• and
• a control center, wherein
• each of the on-vehicle radar devices comprises:
• a transceiver which transmits a monitoring signal in a specified frequency band;
• a controller which repeats alternately a transmission period of a specified length during which the monitoring signal is transmitted by the transceiver and a pause period of a specified length during which no monitoring signal is transmitted by the transceiver;
• a position-information acquiring unit which acquires a position of the device itself;
• and
• a communication unit which communicates with a control center, and wherein
• the control center, based on the position information received from the on-vehicle radar devices, obtains a distance between on-vehicle radar devices, and in the case when a plurality of on-vehicle radar devices exist within a range of a specified distance, based on the priority order of the on-vehicle radar devices, transmits an instruction to shift the transmission period or the monitoring-signal frequency band, and
• the controller, following an instruction received from the control center, shifts the transmission period or the monitoring-signal frequency band.