Pseudorange positioning model considering DCB correction and kinematic performance evaluation.
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摘要: 为评估多系统海上伪距单点定位(single point positioning，SPP)性能，顾及不同导航系统广播星历的卫星钟差基准差异，推导了多系统单频和双频消电离层(ionosphere-free，IF)组合SPP模型. 采用无人船实测的近海多系统GNSS动态观测数据评估了GPS、GPS/Galileo、GPS/BDS和GPS/Galileo/BDS的单频和IF组合SPP定位精度. 结果表明：相较于单一GPS，多系统的SPP定位性能更优，三系统IF组合SPP的平面精度优于0.5 m，天顶方向精度优于0.6 m；相比于多系统单频SPP，多系统IF组合SPP在平面和天向精度提高约1.0 m和1.3 m，基于IF组合的SPP具有更优的定位性能.
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关键词:
- 多系统 /
- 伪距单点定位(SPP) /
- 消电离层(IF)组合 /
- 无人船 /
- 动态定位
Abstract: In order to evaluate the performance of maritime single point positioning (SPP) performance, taking into account the fact that the broadcast satellite clock correction corresponds to the ionosphere-free (IF) combination or single-frequency B3, a multi-system single-frequency and dual-frequency IF SPP model is derived. The IF and single-frequency SPP positioning accuracy of GPS, GPS/Galileo, GPS/BDS and GPS/Galileo/BDS were evaluated using a set of offshore multi-system GNSS data measured by the unmanned surface vehicle (USV). The results show that compared with the GPS-only system, the SPP positioning performance after the system combination is improved with the plane accuracy of the GPS/Galileo/BDS IF SPP being better than 0.5 m, and the vertical direction accuracy being better than 0.6 m. Compared with the single-frequency SPP, the IF SPP has an improved positioning accuracy of about 1.0 m and 1.3 m in the horizontal and vertical directions, and the IF SPP has better positioning performance. -
表 1 卫星平均SNR和MP统计
系统 频率 SNR/dB MP/m GPS P1 43.2 0.13 P2 42.5 0.11 Galileo E1 39.8 0.15 E5a 44.0 0.18 BDS B1I 43.7 0.07 B3I 44.1 0.06 
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