Patent ID: 8094066
Filing Date: 2012-01-10
Classification: G01S

Abstract:
1. A method for calculating a position of a moving vehicle using a first unit that performs a correlation process on a satellite signal received from a satellite to capture the satellite signal and calculate the position and velocity of the moving vehicle and a second unit capable of detecting at least the velocity of the moving vehicle, the method comprising: calculating a determination velocity which is the velocity determined using the results of the calculation by the first unit and the results of the detection by the second unit; calculating an error in the determination velocity using an error in the calculation by the first unit and an error in the detection by the second unit, wherein the calculating of the error in the determination velocity includes calculating a weighted average of the error in the calculation by the first unit and the error in the detection by the second unit; determining a Doppler frequency which is used when the first unit determines the frequency used for searching for the satellite signal using the determination velocity; determining a correlation integration period used when the first unit performs the correlation process using the error in the determination velocity; and calculating the position of the moving vehicle using the results of the calculation by the first unit and the results of the detection by the second unit.