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 uses a first error detecting method when one of a first selection criterion in which an early late differential value is higher than a first threshold (positive value) and an early differential value is lower than a third threshold (negative value), and a second selection criterion in which the early late differential value is lower than a second threshold (negative value) and a late differential value is lower than a fourth threshold (negative value) is satisfied, and the operator uses a second error detecting method when neither criterion is satisfied. A code phase range where an error detection value is not 0 is wide with the first error detecting method, and the code phase range where the error detection value is not 0 is narrow with the second error detecting method.

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 late differential value by subtracting a first late correlation value that is obtained based on the correlation result between the GNSS signal and the first late 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, calculating an early differential value by subtracting, from the first early correlation value, a second early correlation value that is obtained based on the correlation result between the GNSS signal and the second early replica signal, and calculating a late differential value by subtracting, from the first late correlation value, a second late correlation value that is obtained based on the correlation result between the GNSS signal and the second late replica signal; an error detection value calculating process for setting an error calculating method based on the early late differential value and either one 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 control process for controlling a code phase of the prompt replica signal based on the error detection value.