Patent ID: 6990140
Filing Date: 2006-01-24
Classification: G01S,H04B

Abstract:
1. A method for receiving an incoming signal having data bits spread by a spreading code for fast acquisition of weak global positioning system (GPS) signals, said method comprising: segmenting an expected reception time period for at least two expected said data bits having known polarities into A and B time segments, said A time segments alternating with said B time segments; establishing an A time period including said A time segments and a B time period including said B time segments; depolarizing a representation of said incoming signal according to said known polarities for providing a depolarized representation of said incoming signal; and determining A time period magnitudes and B time period magnitudes from said depolarized representation of said incoming signal for said A time period and said B time period, respectively, said A time period magnitudes corresponding to code phases, respectively, of said spreading code and said B time period magnitudes corresponding to said code phases, respectively, of said spreading code by determining integrations of said depolarized representation of said incoming signal for time lengths not greater than said A time segments and not greater than said B time segments; and accumulating said integrations for said A time period and said B time period for providing said A time period magnitudes and said B time period magnitudes, respectively.