Positioning device, electronic instrument, and storage medium storing program

A GPS receiver comprising:

• an RF reception circuit section that receives a GPS signal;
• a memory that stores the GPS signal received by the RF reception circuit section;
• a read position determination section that reads a first GPS signal by reading the first GPS signal from the memory from a first read start position, and reads a second GPS signal that overlaps the first GPS signal by reading the second GPS signal from the memory from a second read start position, and determines a read start position of an acquisition target satellite signal based on a signal strength of the acquisition target satellite signal that is included in each of the first GPS signal and the second GPS signal, the second read start position is obtained by adding a time shorter than an inversion time interval of a navigation message to the first read position;
• an acquisition section that acquires the acquisition target satellite signal based on the GPS signal read from the memory using the read start position determined by the read position determination section;
• and
• a positioning section that performs a positioning process using the acquisition target satellite signal acquired by the acquisition section.

A GPS receiver comprising:

• an RF reception circuit section that receives a GPS satellite signal;
• a memory that stores a signal received by the RF reception circuit section;
• a set-unit signal strength calculation section that calculates a signal strength of an acquisition target satellite signal corresponding to each of M (M≧2) specific-time signal sets obtained at intervals of a specific set-to-set offset time, one specific-time signal set including N (N≧2) specific-time signals obtained from the memory at intervals of a specific unit offset time;
• a specific-time signal strength calculation section that calculates the signal strength of the acquisition target satellite signal corresponding to each of the specific-time signals included in the specific-time signal set having a maximum signal strength calculated by the set-unit signal strength calculation section;
• a determination section that determines a read position of the acquisition target satellite signal based on an inversion time interval of a navigation message and the position of the memory at which the specific-time signal having the maximum signal strength calculated by the specific-time signal strength calculation section is stored;
• an acquisition section that acquires the acquisition target satellite signal based on the signal read from the memory using the read position determined by the determination section;
• and
• a positioning section that performs a positioning process using the acquisition target satellite signal acquired by the acquisition section.

A method of controlling a GPS receiver comprising:

• receiving a GPS signal;
• storing the received GPS signal in a memory;
• reading a first GPS signal by reading the first GPS signal from the memory from a first read start position, and reading a second GPS signal that overlaps the first GPS signal by reading the second GPS signal from the memory from a second read start position, and determining a read start position of an acquisition target satellite signal based on a signal strength of the acquisition target satellite signal that is included in each of the first GPS signal and the second GPS signal;
• acquiring the acquisition target satellite signal based on the GPS signal read from the memory using the determined read start position;
• and
• performing a positioning process using the acquired acquisition target satellite signal.

A method of controlling a GPS receiver comprising:

• receiving a GPS signal;
• storing the received GPS signal in a memory;
• calculating a signal strength of an acquisition target satellite signal corresponding to each of M (M≧2) specific-time signal sets obtained at intervals of a specific set-to-set offset time, one specific-time signal set including N (N≧2) specific-time signals obtained from the memory at intervals of a specific unit offset time;
• calculating the signal strength of the acquisition target satellite signal corresponding to each of the specific-time signals included in the specific-time signal set having a maximum signal strength;
• determining a read position of the acquisition target satellite signal based on an inversion time interval of a navigation message and the position of the memory at which the specific-time signal having the maximum signal strength is stored;
• acquiring the acquisition target satellite signal based on a signal read from the memory using the read position;
• and
• performing a positioning process using the acquired acquisition target satellite signal.