Abstract: A system and method for communicating a vehicle with a calling party are disclosed in which even when a communication circuit is interrupted during a data communication of the system with the calling party such as a base station due to a worse circuit condition, the calling from the system to the calling party is carried out without operation of a switch for activating the system to start calling so that the communication with the calling party is restarted. The communication data includes a vehicle identification code (ID information) and/or instantaneous position of the vehicle.

Abstract: A moving obstacle detection system using a Doppler radar device for an automotive vehicle which detects and informs a vehicle driver that another vehicle (moving obstacle) approaches or moves away from the detecting vehicle, wherein there is provided a means for determining whether the rate of change of the period of a Doppler signal outputted from the Doppler radar equipment with respect to time exceeds a predetermined value so that an erroneous alarm in response to a pedestrian or another vehicle traversing the front detection area of the vehicle, e.g., when vehicle is at rest at in an intersection is inhibited. Consequently, more reliable detection of approach or departure of another vehicle can be achieved.