Vehicle communication device
Abstract:
A moving device receives a 100% duty measurement signal transmitted from an in-vehicle device. The receive strength of the received measurement signal is divided into unit time, and the average value of the receive strength for each unit time is determined The maximum value and the minimum value of the average value are determined, and the ratio between the maximum value and the minimum value is transmitted to the in-vehicle device as signal strength fluctuation information. The in-vehicle device determines that a communication state is abnormal if it is determined that the fluctuation ratio exceeds a predetermined threshold.
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