Satellite radio wave receiving apparatus, radio controlled watch, code signal acquiring method, and recording medium

A code signal acquiring method for acquiring a code signal from a reception signal of a radio wave including a code signal transmitted from a satellite, the code signal acquiring method comprising:

• identifying a pseudo-random code sequence used for performing spread spectrum to the code signal and a phase of the pseudo-random code sequence in a transmission period;
• identifying a code type of the code signal for every transmission period;
• identifying, by comparing an array of the identified code type with a plurality of comparison arrays expected to appear as the array of the code type, a head timing of each code in the code signal according to the comparison array in which a result of the comparison satisfies a predetermined condition,
• wherein the comparison array has a length according to a transmission time of each code in the code signal, and
• wherein in the length of the comparison array, a plurality of periods of results of the comparison of the array of the code type with the comparison array is accumulated;
• and
• identifying each code in synchronization with the identified head timing.

A non-transitory recording medium recording a computer-readable program for acquiring a code signal from a reception signal of a radio wave including a code signal transmitted from a satellite, the computer-readable program causing a computer to:

• identify a pseudo-random code sequence used for performing spread spectrum to the code signal and a phase of the pseudo-random code sequence in a transmission period;
• identify a code type of the code signal every time according to the transmission period;
• identify, by comparing an array of the identified code type with a plurality of comparison arrays expected to appear as the array of the code type, a head timing of each code in the code signal according to the comparison array in which a result of the comparison satisfies a predetermined conditions,
• wherein the comparison array has a length according to a transmission time of each code in the code signal, and
• wherein in the length of the comparison array, a plurality of periods of results of the comparison of the array of the code type with the comparison array is accumulated;
• and
• identify each code in synchronization with the identified head timing.