区域CORS网络增强PPP天顶对流层延迟内插建模
Zenith Troposphere Delay Interpolation Model for Regional CORS Network Augmented PPP
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摘要: 研究了利用区域CORS网基站上解算的高精度ZPD内插流动站ZPD的空间回归模型的适用性和内插效果,证明了H1QM3模型与MLCM模型等价。在此基础上,提出利用高差约束改善内插精度的空间回归模型。实验表明,H1QX1模型和H1QM3模型稳定,在平缓区域能获得10mm以内的插值精度,在起伏地区可获得20mm以内的插值精度;使用高差约束后,高程变化剧烈地区ZPD的内插精度可改善60%;内插参考站数量为9或10时效果最佳。Abstract: Taking a priori precise ZPD derived from CORS network to augment PPP can reduce the number of unknown parameters,accelerate its ambiguity resolution in PPP and shorten the convergence time.We investigate the applicability and interpolation effect of spatial regression model in which precise ZPD derived from regional CORS network are used to interpolate ZPD for user site.We also demonstrate that H1QM3 model and MLCM model are equivalent,and propose the height constraint strategy to improve interpolation precision.It is shown that the H1QX1 model and H1QM3 model are superior to other models,interpolation precision is 10 mm in the flat region and 20mm in the undulated region.With height constraint,the precision of intepolated ZPD can be improved by 60% in the undulated region.The optimal number of reference stations for intepolation is 9 or 10.
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