NAVIGATION MESSAGE ACQUIRING METHOD, SUBFRAME PRODUCING METHOD, NAVIGATION MESSAGE ACQUIRING PROGRAM, GNSS RECEIVER APPARATUS, AND MOBILE TERMINAL

摘要

A GPS receiver apparatus is provided which can reliably and efficiently acquire a navigation message, in particular, an ephemeris. A navigation message acquiring unit (14) of the GPS receiver apparatus acquires bit data on a word-by-word basis from a received bit data sequence. During this acquisition, if a series of words that constitute one subframe are not successfully acquired in one frame (S401: No), then only words that have been precisely decoded are stored (S402). During this storage, in addition to the words that have been precisely decoded, the last two bits of the immediately preceding word are also stored. If all words that constitute one subframe are successfully acquired in a plurality of frames (S403: Yes), the last two bits of the immediately preceding word stored together with the words are used to perform a phase matching among the words (S404). The words as phase matched are then coupled together to form a complemented subframe (S405), which is then outputted together with time-of-week information (S406).