Patent ID: 7692581

Claim:
A positioning device comprising: an RF reception circuit section that receives a GPS satellite signal; a memory that stores signals received by an RF reception circuit section; a read position determination section that reads the signals for a specific period of time from the memory while changing a read position from which the read position determination section reads the signals by a time shorter than an inversion time interval of each of the signals so that read ranges overlap, the read position determination section that determines a signal strength of an acquisition target satellite signal that is a GPS satellite signal from an acquisition target satellite included in each of the signals for the specific period of time read from the memory, the read position determination section that determines the read position of the acquisition target satellite signal based on the signal strength, the inversion time interval containing only one polarity reverse of the signal; an acquisition section that acquires the acquisition target satellite signal based on the signal read from the memory using the read position; a positioning section that performs a positioning process to identify where a current position of the positioning device is by using the acquisition target satellite signal acquired by the acquisition section; and a display section that displays the current position.