POSITIONING SIGNAL DETECTION METHOD, POSITIONING SIGNAL DETECTION PROGRAM, POSITIONING SIGNAL RECEIVING DEVICE, POSITIONING APPARATUS AND INFORMATION DEVICE TERMINAL

摘要

Whether received positioning signals are target positioning signals is determined accurately. A first code phase difference of a first replica code signal of a positioning signal St A (CODE A ) and a second code phase difference of a second replica code signal of a positioning signal St B (CODE B ) are acquired (S101). A first pseudorange Á1 is calculated based on the first code phase difference and a second pseudorange p2 is calculated based on the second code phase difference (S102). An absolute value of a pseudorange difference that is a differential value between the first pseudorange Á1 and the second pseudorange p2 is calculated. If the absolute value of the pseudorange difference is lower than a threshold THc (S103: YES), the positioning signals of which codes are currently tracked are determined to be the positioning signals St A (CODE A ) and St B (CODE B ) from a target positioning satellite SATt (S104). If the absolute value of the pseudorange difference is higher than the threshold THc (S103: NO), cross-correlation is determined to have occurred (S105).