高纬度BDS/GPS PPP中的对流层延迟改正模型优选

由于高纬度地区气温气压值及变化率与中低纬度地区有较大差异,因此目前发布的多种对流层延迟模型在高纬度地区使用的精度会不同。为了给高纬度地区BDS/GPS用户提供更好的对流层延迟模型选择,文中采用UNB3,EGNOS和GPT2模型,以IGS发布的ZPD产品和SINEX文件作为参考,对比基于这三种对流层延迟模型计算的天顶对流层总延迟量以及精密单点定位精度,可知GPT2较UNB3和EGNOS在高纬度地区定位中有更好的精度表现。

Optimal selection of the troposphere delay models in high-latitude BDS/GPS PPP

Because the variations of temperature and pressure at high-latitude are different from low- and mid-latitude regions,the released tropospheric delay models may perform diversely at high-latitude regions.In order to provide better selection of troposphere delay model for BDS/GPS PPP users,the performances of the University of New Brunswick 3(UNB3)model,European Geostationary Navigation Overlay Service(EGNOS)model and Global Pressure and Temperature 2(GPT2)model are used in zenith tropospheric delay(ZTD)estimating and BDS/GPS PPP solutions are compared with the reference of ZPD products and SINEX files provided by IGS.The result shows that the GPT2 model performs better than UNB3 and EGNOS model in high-latitude positioning.