GNSS SIGNAL PROCESSING METHOD, POSITIONING METHOD, GNSS SIGNAL PROCESSING PROGRAM, POSITIONING PROGRAM, GNSS SIGNAL PROCESSING DEVICE, POSITIONING APPARATUS AND MOBILE TERMINAL

摘要

A demodulation unit for a GNSS signal processing device includes an operator that selects an error detecting method based on signs of early and late differential values and calculates an error detection value. A code phase range where an error detection value is not 0 is wide with a first error detecting method, and is narrow with a second. Immediately after capturing a GNSS signal, a code phase difference between the GNSS signal and a prompt replica signal is large, and signs of the early differential value and the late differential value are different from each other. In this case, the first method is used. As the code phase is driven, the code phase difference between the GNSS signal and the prompt replica signal becomes smaller, and the signs of the early differential value and the late differential value become the same. In this case, the second method is used.

主权项

1. A GNSS signal processing method, comprising:
a correlating process for correlating a GNSS signal with each of a first early replica signal that is advanced from a prompt replica signal by a first code phase, a first late replica signal that is retarded from the prompt replica signal by the first code phase, a second early replica signal that is advanced from the prompt replica signal by a second code phase, and a second late replica signal that is retarded from the prompt replica signal by the second code phase; a differential value calculating process for calculating an early differential value by subtracting a second early correlation value that is obtained based on the correlation result between the GNSS signal and the second early replica signal from a first early correlation value that is obtained based on the correlation result between the GNSS signal and the first early replica signal, and calculating a late differential value by subtracting a second late correlation value that is obtained based on the correlation result between the GNSS signal and the second late replica signal from a first late correlation value that is obtained based on the correlation result between the GNSS signal and the first late replica signal; an error detection value calculating process for setting an error calculating method based on signs of the early differential value and the late differential value, and calculating an error detection value by using the set error calculating method; and a code phase controlling process for controlling a code phase of the prompt replica signal based on the error detection value, and tracking a code phase of the GNSS signal.