To previously prevent theft of a vehicle, robbery of the vehicle and mischief to the vehicle by sensing the approaching of a suspicious person even at a parking/stopping place away from home, not limited to a specific parking place.
Received electric wave strength when an electric wave from a transmission means 2 is received by a receiving means 5 is measured by RSSI measurement means 7 to perform monitoring, and it is detected that RSSI usually indicating a steady-state value is fluctuated by approaching of the suspicious person to the vehicle. Informing is performed to a portable radio device 11 possessed by a driver by an informing means 3, a horn is blown and a light is flashed using ECU connection means 10. Thereby, the suspicious person 18 is threatened and crime and mischief are previously prevented. Since monitoring can be performed only by the vehicle radio device 1 installed on a vehicle body, installation of a specific facility to the parking place is not required and monitoring function can be provided without selecting the parking/stopping place.
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SASAKI SHINSUKE
KUSHIZAKA TORU
Hiroki Naito
Daisuke Nagano
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