국내기사
GPS CNAV, QZSS LNAV/CNAV 및 BDS CNAV/CNAV-2의 방송 주기와 시퀀스에 대한 실험적 분석 = An experimental investigation on broadcast intervals and sequences of GPS CNAV, QZSS LNAV/CNAV, and BDS CNAV/CNAV-2
Various structures of navigation messages in Global Navigation Satellite System (GNSS) signals can be categorized into fixed, packetized, and mixed types, each with different broadcast intervals and sequences. In the fixed format, the broadcast intervals and sequences of navigation messages of Global Positioning System (GPS) L1 C/A and BDS B1I are strictly defined in the Interface Control Document (ICD). Navigation messages of GPS L2C, L5, Quasi-Zenith Satellite System (QZSS) L2C, L5, and BeiDou Navigation Satellite System (BDS) B1C are in a packetized format, and their broadcast sequence is not explicitly specified in the ICD; only the maximum broadcast intervals are described. In the mixed format, signals such as GPS L1C, QZSS L1 C/A, L1C, and BDS B2a exhibit both fixed and packetized patterns. Sequences of certain parts of the message are not defined. Therefore, in this study, experimental-based investigations were additionally conducted alongside an ICD investigation to analyze the current broadcast intervals and sequences of GNSS navigation messages.