An autocalibration method for use within an electronic compass in a vehicle is disclosed. Black matrixes are formed upon the upper substrate and color filters are formed between the black matrixes. The impact portion can include a central impact plate having a pair of ends and a side impact plate disposed at each of the pair of ends of the central impact plate. Alternatively, the idle state protocol submodule performs pilot measurement according to received measurement indication information sent by an air interface connection management protocol submodule when the idle state protocol submodule is activated. A digital feedback loop provides a second input to the digital phase detector from the output of the digital controlled oscillator. Within a period in which the correction information is valid, the mobile station requests communication resource allocation information from the base station, using a random access channel having guard time.