Patent ID: 8149164
Filing Date: 2012-04-03
Classification: G01S

Abstract:
1. A signal processing system for demodulating a plurality of navigation bits from a satellite signal, comprising: a digital baseband processor for determining a boundary between two navigation bits in said navigation bits according to a first plurality of coarse acquisition (C/A) codes captured from said satellite signals, storing said first plurality of C/A codes, and demodulating a second plurality of C/A codes captured after determining said boundary to recover a first series of said navigation bits; and a complementary demodulating unit coupled to said digital baseband processor for demodulating said first plurality of C/A codes to recover a second series of said navigation bits, wherein said complementary demodulating unit is capable of: calculating a start position of a series of C/A codes in said first plurality of C/A codes, said series of C/A codes being used for modulating a corresponding navigation bit in said second series of said navigation bits; calculating an end position of said series of C/A codes in said first plurality of C/A codes; and determining a value of said corresponding navigation bit according to integral values of said series of C/A codes between said start position and said end position in said first plurality of C/A codes.