Zhang Yong, Wang Qing, Jiang Xinyuan
School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China.
Germany Research Center For Geosciences (GFZ), Telgrafenberg, 14473 Potsdam, Germany.
Sensors (Basel). 2017 May 19;17(5):1162. doi: 10.3390/s17051162.
The real-time estimation of the wide-lane and narrow-lane Uncalibrated Phase Delay (UPD) of satellites is realized by real-time data received from regional reference station networks; The properties of the real-time UPD product and its influence on real-time precise point positioning ambiguity resolution (RTPPP-AR) are experimentally analyzed according to real-time data obtained from the regional Continuously Operating Reference Stations (CORS) network located in Tianjin, Shanghai, Hong Kong, etc. The results show that the real-time wide-lane and narrow-lane UPD products differ significantly from each other in time-domain characteristics; the wide-lane UPDs have daily stability, with a change rate of less than 0.1 cycle/day, while the narrow-lane UPDs have short-term stability, with significant change in one day. The UPD products generated by different regional networks have obvious spatial characteristics, thus significantly influencing RTPPP-AR: the adoption of real-time UPD products employing the sparse stations in the regional network for estimation is favorable for improving the regional RTPPP-AR up to 99%; the real-time UPD products of different regional networks slightly influence PPP-AR positioning accuracy. After ambiguities are successfully fixed, the real-time dynamic RTPPP-AR positioning accuracy is better than 3 cm in the plane and 8 cm in the upward direction.
利用区域参考站网实时观测数据实现了卫星宽巷和窄巷无电离层延迟（UPD）的实时估计；依据天津、上海、香港等地的区域连续运行参考站（CORS）网实时观测数据，对实时UPD产品特性及其对实时精密单点定位模糊度解算（RTPPP - AR）的影响进行了实验分析。结果表明，实时宽巷和窄巷UPD产品在时域特性上差异显著；宽巷UPD具有日稳定性，变化率小于0.1周/天，而窄巷UPD具有短期稳定性，一日内变化显著。不同区域网生成的UPD产品具有明显的空间特性，对RTPPP - AR有显著影响：采用区域网中稀疏站点估计的实时UPD产品有利于将区域RTPPP - AR成功率提高到99%；不同区域网的实时UPD产品对PPP - AR定位精度有轻微影响。模糊度成功固定后，实时动态RTPPP - AR定位精度平面优于3 cm，高程优于8 cm。
