A distance measurement apparatus of an embodiment includes a first device provided in a vehicle and a second device provided in a key-fob, and calculates a distance between the vehicle and the key-fob based on carrier phase detection. In at least one of the first device and the second device, transmission powers at which a plurality of first distance measurement signals are respectively transmitted when the key-fob is inside the vehicle are set to be lower than transmission powers at which a plurality of first distance measurement signals are respectively transmitted when the key-fob is outside the vehicle.


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    Title :

    DISTANCE MEASUREMENT APPARATUS


    Contributors:

    Publication date :

    2021-09-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G01S RADIO DIRECTION-FINDING , Funkpeilung / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / G07C TIME OR ATTENDANCE REGISTERS , Zeit- oder Anwesenheitskontrollgeräte




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