Patent ID: 7209514
Filing Date: 2007-04-24
Classification: G01S

Abstract:
1. A global positioning system receiving apparatus comprising: a synchronous acquisition unit which detects a correlation between a spread code of a received signal from a global positioning system satellite and a spread code provided by the apparatus in order to detect a phase of the spread code of said received signal for synchronous acquisition of said spread code of said received signal, said synchronous acquisition unit further detecting a carrier frequency of said received signal when said spread code of said received signal is acquired synchronously; and a synchronous hold unit which has a plurality of channels and which allocates one of said channels to one of a plurality of global positioning system satellites when a spread code of the received signal from the global positioning system satellite in question is synchronously acquired and a carrier frequency of the received signal from the global positioning system satellite in question is detected, said synchronous hold unit further establishing initial values based on the spread code phase of said received signal following detection by said synchronous acquisition unit as well as on the likewise-detected carrier frequency of said received signal, before starting synchronous hold of said spread code and said carrier frequency regarding the signal from the global positioning system satellite in question while decoding the signal from said global positioning system satellite.