SIGNAL CAPTURE METHOD, COMMUNICATION SIGNAL RECEPTION METHOD, GNSS SIGNAL RECEPTION METHOD, SIGNAL CAPTURE PROGRAM, COMMUNICATION SIGNAL RECEPTION PROGRAM, GNSS SIGNAL RECEPTION PROGRAM, SIGNAL CAPTURE DEVICE, COMMUNICATION SIGNAL RECEPTION DEVICE, GNSS SIGNAL RECEPTION DEVICE, AND MOBILE TERMINAL

PROBLEM TO BE SOLVED: To realize a signal capture method capable of quickly and securely capturing a desired GPS signal with a simpler method than a conventional method.SOLUTION: A non-coherent cumulative value NCi and a coherent cumulative value Ci are calculated at a provisional code phase and provisional frequency (S103). If both the non-coherent cumulative value NCi and the coherent cumulative value Ci are lower than a verifying threshold (yes for S104), or the non-coherent cumulative value NCi is higher than the verifying threshold and the non-coherent cumulative value NCi is approximately equal to the coherent cumulative value Ci (yes for S105), the provisional code phase and the provisional frequency are set as a true code phase and a true frequency (S107). If the non-coherent cumulative value NCi is higher than the verifying threshold and if the difference between the non-coherent cumulative value NCi and the coherent cumulative value Ci is at a predetermined strength or higher, a capturing process is performed once again by fixing the code phase (S106) to detect a true frequency (S107).