顾及钟差变化率的GPS卫星钟差预报法

发布时间：2018-01-11 00:17

本文关键词：顾及钟差变化率的GPS卫星钟差预报法　出处：《测绘学报》2016年12期 　论文类型：期刊论文

【摘要】：提出了一种基于钟差变化率拟合建模的卫星钟差预报方法。以附加周期项的线性或二次多项式作为基础模型对钟差变化率序列进行拟合,最优估计卫星钟差的趋势项系数,然后直接使用精密定轨得到的相应时刻的卫星钟差计算预报初始时刻的基准项系数,来建立卫星钟差的预报模型。以IGS发布的快速星历(IGR)的卫星钟差为试验数据,对GPS星座中各种型号的所有卫星钟差进行预报。结果表明:本文方法3、6、12与24h的预报精度分别可达0.43、0.58、0.90与1.47ns,相比于传统的基于钟差拟合的预报方法,精度分别提高69.3%、61.8%、50.5%与37.2%;与IGS发布的超快速星历(IGU)的预报钟差相比,钟差精度分别提高15.7%、23.7%、27.4%与34.4%。
[Abstract]:In this paper, a satellite clock error prediction method based on clock variation rate fitting model is proposed. The linear or quadratic polynomial with periodic term is used as the basic model to fit the clock difference rate series. The trend term coefficient of satellite clock error is estimated optimally, and then the reference term coefficient of predicting initial time is calculated directly by using the satellite clock error obtained by precise orbit determination. A prediction model of satellite clock error is established. The satellite clock error of IGS is used as the experimental data. All satellite clock differences of various types in GPS constellation are forecasted. The results show that the prediction accuracy of this method can reach 0.433 / 0.58 and 0.43 / 0.58 respectively. 0.90 and 1.47 ns, compared with the traditional prediction method based on clock difference fitting, the accuracy of 0.90 and 1.47 ns were increased by 69.3% and 37.2%, respectively. Compared with the prediction clock error of IGS, the accuracy of clock error is increased by 15.723.723.723.4% and 34.4% respectively.
【作者单位】：武汉大学测绘学院;地球空间信息技术协同创新中心;
【基金】：国家重点研发计划(2016YFB0501803) 国家自然科学基金(41374035)~~
【分类号】：P228.4
【正文快照】： 利用IGS发布的GPS事后精密轨道与钟差产品,基于载波相位观测数据的精密单点定位(PPP)技术可以实现厘米甚至毫米级的定位精度。但IGS发布的GPS事后精密星历产品都存在不同程度的时间延迟,因此无法应用于实时导航定位。虽然目前IGS发布的实时精密轨道产品(IGU-P)的轨道精度已达

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