基于GNSS基准站网的对流层延迟建模

Tropospheric delay modeling based on GNSS network

针对在卫星导航定位中,通常采用对流层模型进行,对流层延迟误差修正的现状,该文研究了一种基于GNSS基准站网的对流层延迟建模方法,并基于此方法利用日本地区GENET参考网约737个站5a的GNSS-ZTD序列建立了区域对流层模型ZTDM-JPN,并将ZTDM-JPN模型应用于GPS及北斗定位实验,分析了其在GPS及北斗定位中的实际应用性能。通过与国际上常用的对流层模型EGNOS、UNB3m作比较,结果表明,ZTDM-JPN模型的模拟精度较相同条件下的EGNOS与UNB3m模型分别提升约26%和21%,从而验证了该建模方法的可行性与优越性。

In view of the present situation that troposphere model is usually used to correct tropospheric delay error in global navigation satellite system（GNSS）,a new method of constructing tropospheric model based on the GNSS network was proposed in this paper,and a regional tropospheric model called ZTDM-JPN were established based on the proposed method using the GNSS-derived ZTDs covering 5-year period collected from the 737 GNSS stations of GENET.The ZTDM-JPN model was applied into the GPS and BeiDou Positioning experiment to show its effectiveness.Furthermore,the comparison between the ZTD-JPN and the commonly used models called EGNOS and UNB3 m were conducted,and the results showed that the ZTDM-JPN model improved the zenith troposphere delay（ZTD）accuracy by about 26%and 21%comparing to EGNOS and UNB3 m models respectively under the same conditions,which verified the feasibility and superiority of the modeling method proposed in this paper.