CODE TRACKING METHOD, GNSS SIGNAL RECEIVING METHOD, CODE TRACKING DEVICE, GNSS SIGNAL RECEIVING DEVICE, INFORMATION DEVICE TERMINAL, CODE TRACKING PROGRAM, AND GNSS SIGNAL RECEIVING PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a code tracking method capable of preventing lock disengagement of a code phase.;SOLUTION: Correlation processing is performed to a base band signal of a reception signal with a P replica signal, an E replica signal, a VE replica signal, an L replica signal, and a VL replica signal, respectively, to calculate each correlation value (S101). Using a P correlation value which is the correlation value between the base band signal and the P replica signal, P correlation signal power P² is calculated (S102). If the P correlation signal power P² is equal to or more than a threshold PTH (S103: Yes), the P correlation signal power P² is set to a normalization computing value A² (S104). If the P correlation signal power P² is less than the threshold PTH (S103: No), the threshold PTH determined by a correlation output during uncorrelated time (correlation by noise) is set to the normalization computing value A² (S105). Using each correlation value and the normalization computing value A² determined in the step 104 or the step 105, a code phase error Δτ is calculated (S106).;COPYRIGHT: (C)2014,JPO&INPIT