Patent ID: 7746918

Claim:
A bit synchronization system for a global position system (GPS), which receives a satellite signal sent by a satellite to accordingly produce a synchronization signal, each data bit of the satellite signal consisting of N coarse/acquisition (CA) codes (CA-codes), where N is an integer, the system comprising: a data buffer, which receives and stores the data bits of the satellite signal; a matched filter, which is connected to the data buffer in order to filter the N CA-codes of each data bit and compute correlations with the N CA-codes of each data bit, and accordingly output a correlation set corresponding to the data bit; a selector, which selects a greatest correlation from the correlation set and uses the CA-code corresponding to the greatest correlation as the synchronization signal; and a correlation combiner, which is connected to the matched filter in order to combine multiple correlation sets into a combined correlation; wherein the correlation combiner respectively adds up corresponding N correlations of the correlation sets.