Patent ID: 7973709
Filing Date: 2011-07-05
Classification: G01S

Abstract:
1. A method for decoding a navigation data by using a phase angle variation applied in an electronic device with a global positioning system (GPS), the method comprising: receiving a satellite signal; acquiring a first navigation data from the satellite signal; calculating a first phase angle of the first navigation data; acquiring a second navigation data subsequent to the first navigation data from the satellite signal; calculating a second phase angle of the second navigation data; calculating a phase angle difference between the first phase angle and the second phase angle; determining whether the phase angle difference is greater than 90 degrees or not; when the phase angle difference is greater than 90 degrees, determining that the second navigation data is opposite to the first navigation data, and recording the second navigation data; and when the phase angle difference is smaller than or equal to 90 degrees, determining that the second navigation data is the same as the first navigation data, and recording the second navigation data.