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

摘要

A demodulation unit (13) corresponding to a GNSS signal processing device comprises an arithmetic unit (33). The arithmetic unit (33) selects an error detection method, in accordance with the code for an early difference value (DeltaCVE) and a late difference value (DeltaCVL). The arithmetic unit (33) calculates the error detection value (Deltatau), using the selected error detection method. A first error detection method has a broad non-zero error detection value code phase range, and a second error detection method has a narrow non-zero error detection value code phase range. Immediately after capture, the code phase difference between a GNSS signal and a prompt replica signal (SRP) is large, and the codes for the early difference value (DeltaCVE) and the late difference value (DeltaCVL) differ. In this case, the first error detection method is used. As the code phase is tracked, the code phase difference between the GNSS signal and the prompt replica signal (SRP) reduces, and the code for the early difference value (DeltaCVE) and the late difference value (DeltaCVL) becomes the same. In this case, the second error detection method is used.