不同IGS精密产品对BDS评估ZTD差异性分析

Difference Analysis of Different IGS Precision Products on the BDS Assessment ZTD

分析了ESA、GBM以及WUM 3种精密产品在精密单点定位以及天顶对流层延迟评估中的差异性。实验结果表明,BDS采用3种精密产品解算得到的精密单点定位精度都在cm级,但是采用GBM产品解算精度最优,其次为ESA产品,最低为WUM产品。采用ESA、GBM2种精密产品均能精确评估出ZTD值随历元变化情况,其中静态精密单点定位评估ZTD估值RMS差值均在mm级,而动态精密单点定位GBM产品评估ZTD估值RMS差值在mm级,ESA产品评估ZTD估值RMS差值在cm级,但WUM产品不适合进行ZTD值评估。

In this paper,we used BDS precision single-point positioning technology to compare and analyze the three precision products of ESA,GBM and WUM in precision single-point positioning,and differences in positioning and assessment of zenith tropospheric delay(ZTD).The ex-perimental results show that the precision single-point positioning accuracy obtained by BDS using three types of precision products are all at cm level,but the GBM product has the best solution accuracy,followed by ESA products,and the lowest is WUM products.Using ESA and GBM two kinds of precision products can accurately evaluate the change of ZTD value with epoch.Among them,the RMS difference of static preci-sion single-point positioning assessment ZTD is in the mm level,and the RMS difference of dynamic precision single-point positioning GBM product assessment ZTD is at the mm level,and the ESA product assessment ZTD is at the cm level,but the WUM product is not suitable for as-sessment ZTD.