摘要：With the EGNOS safety-of-life service being declared available, the first four Galileo satellites in orbit, and other constellations being upgraded to dual-frequency capability, now is a good time to investigate the effects of an increased number of ranging sources on integrity. This article compares two future integrity concepts that are believed to benefit the most from these additional ranging sources: an upgraded dual-frequency satellite-based augmentation system and an advanced receiver autonomous integrity monitoring algorithm with optimized continuity and integrity allocation
