In order to solve the problem that the PKE (passive keyless enter) with a\nfixed-frequency used in middle and low grade cars was interfered and broken\neasily, which led to the damage of anti-theft system and even the loss of cars,\nand in order to ensure the PKE can be used long and be expanded and upgraded\nin the future, a new, low power consumption and high reliability PKE\nwas designed with the S3C2410 microprocessor which is based on ARM9\nand the RF transceiver chip nRF905 which has the function of frequency\nmodulation. As frequency-hopping communication technology was used in\nthe system, the information would not be disturbed or blocked in the communication\nprocess, which increased the reliability of the system. With reasonable\npower-management module, the system power consumption was greatly reduced.\nTest shows that the new PKE can well meet the practical application.
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