Patent ID: 8908805

Claim:
A signal receiving method comprising: receiving, as a received signal, a carrier wave of a navigation message that is modulated according to a BPSK (Binary Phase Shift Keying) modulation scheme; demodulating the received signal to generate a demodulation result; performing an error detection process on the demodulation result using an error detection bit that is included in the demodulation result; generating a verification word using the demodulation result and a check code when an error is detected by the error detection process, the check code being determined in advance for each bit of the navigation message based on a predetermined encoding rule; estimating an originating bit of a demodulation error in a navigation message word of the navigation message based on the generated verification word and a predetermined verification word table; and correcting the demodulation result by inverting at least the bit values of all remaining bits of the navigation message word subsequent to the estimated originating bit.