BDS/GPS/GLONASS组合的双频单历元相对定位性能对比分析
摘要
With the development of China's BeiDou navigation satellite system (BDS) in the Asia-Pacific region, GPS, GLONASS, and BDS are the only current systems that have the capability of providing independent services. Combining the three systems is an inevitable trend in GNSS-based navigation and positioning. At present, relative positioning based on either pseudo-range or carrier phase is one of the main techniques used in providing high-accuracy GNSS positioning. In this contribution, we compared and analyzed the performance of dual-frequency single-epoch relative positioning of the three systems, GPS, BDS, and GLONASS, and the combined systems, referred to as BDS/GPS, GPS/GLONASS, BDS/GLONASS, and BDS/GPS/GLONASS. The results presented show that: (1) it is appropriate to set the measurement error ratio of the BDS/GPS/GLONASS observations to 1:1:2 for combined pseudo-range relative positioning and 1:1:1 for combined single-epoch carrier phase relative positioning; (2) positioning performance using BDS/GPS is superior to that of GPS/GLONASS or BDS/GLONASS, and can be further improved using BDS/GPS/GLONASS; (3) with short baseline (<20 km), the improvements in accuracy of the pseudo-range and single-epoch carrier phase relative positioning of BDS/GPS/GLONASS relative to that of the single BDS, GPS, and GLONASS are 48.4%, 31.7%, 65.7% and 6.1%, 12.5%, 39.4%, respectively.