模糊度固定与弧段长度对区域站定轨的影响分析

发布时间：2018-06-16 17:32

本文选题：区域定轨 + 模糊度固定　；参考：《武汉大学学报(信息科学版)》2016年02期

【摘要】：我国北斗卫星导航系统难以实现境外全球布站,采用区域站观测值是实现高精度定轨的主要手段。本文分析了整网模糊度固定、有效定轨弧段选择对提高区域定轨精度的作用。采用陆态网GPS观测数据进行区域精密定轨仿真验证,首先论证了不同测站分布下,整网模糊度固定对区域定轨精度的效果,结果表明:相同测站条件下,固定解定轨精度比浮点解精度提高30%以上;仅采用国内7个站的固定解三维定轨精度即达到20cm左右,优于27站的浮点解精度。另外,从星座的构型与地面站分布的可视范围方面,分析了不同观测时长对定轨精度影响,实测数据论证表明:当中国区域站观测时间大于48h,总能获取不小于24h的区域有效定轨弧段,并且各卫星最佳的24h观测弧段三维定轨精度均可达到0.3m左右。
[Abstract]:It is difficult for China's Beidou satellite navigation system to achieve the global distribution of foreign stations, and the use of regional station observations is the main means to achieve high precision orbit determination. In this paper, the effect of fixed ambiguity of the whole network and the selection of effective orbit determination arc on improving the precision of orbit determination in the region is analyzed. The regional precision orbit determination is verified by GPS observation data of land network. Firstly, the effect of fixed ambiguity of the whole network on the precision of orbit determination is demonstrated under different station distribution. The results show that: under the same station conditions, The precision of fixed solution is more than 30% higher than that of floating-point solution, and the precision of three-dimension orbit determination by using only 7 stations in China is about 20cm, which is better than that of floating-point solution of 27 stations. In addition, from the configuration of constellation and the visible range of earth station distribution, the influence of different observation time on orbit determination accuracy is analyzed. The experimental data show that when the observation time of the Chinese regional station is more than 48 hours, the effective orbit determination can always be obtained in the region not less than 24 hours, and the best 3D orbit determination accuracy of the 24 hours observation arc segment of each satellite can reach about 0.3 m.
【作者单位】：武汉大学卫星导航定位中心;
【基金】：国家自然科学基金(41374034)~~
【分类号】：P228.4

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