Satellite time determination for the SPS receiver

摘要

PROBLEM TO BE SOLVED: To provide a method and a device in which an SPS receiver improves the position determination performance capable of determining a position in a special weak coverage area where, though at least two satellite signals can be received, only one time stamp can be safely demodulated.;SOLUTION: A receiver can determine time related to bit end transition to a signal form a satellite by utilizing time reference safely decoded. The receiver sets time to at least one bid end transition to a signal from the other satellite where time stamp is not demodulated by utilizing bid end transition having a known time. The receiver sets the time hypothesis to the bid end transition including the bit end transition having the known time and generated in a predetermined window. The position can be determined on the basis of the time hypothesis. The time hypothesis and the position of the window can be corrected in accordance with an ineffective position solution.;COPYRIGHT: (C)2014,JPO&INPIT