基于GM(1,1)灰色模型卫星钟差短期预报的精度分析  

Precision analysis of short-term prediction of satellite clock error based on gray model GM(1,1) method

作　　者：杨富春[1] 黄张裕[1] 贾莹媛[1] 杨志文[1] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098

出　　处：《测绘工程》2012年第5期25-29,共5页Engineering of Surveying and Mapping

摘　　要：为了提高GPS快速单点定位的精度,必须及时获得高精度的精密星历。基于卫星钟差变化的灰色特性,建立GPS卫星钟差GM(1,1)灰色模型,对卫星钟差进行短期预报。计算结果表明,灰色模型GM(1,1)用于卫星钟差短期预报,只需要使用少数几个历元的已知卫星钟差进行建模,不仅减少建模数据量,提高建模速度,而且预报精度较高,可以满足GPS快速单点定位的实际需要;并对卫星搭载的原子钟精度进行分析,得出基于灰色模型GM(1,1)分析的Rb钟的精度和稳定性要优于Cs钟。In order to improve the precision of fast single point positioning, the precise ephemeris with high- precision is required. On the basis of a gray system characteristic of satellite clock error changing, agray model GM（1,1） of GPS satellite clock error is provided to make short-term prediction of satellite clock er- ror. The results of calculation indicate that gray model GM （1,1） only requires several known satellite clock error to establish the model, which not only largely reduces the number of data used but also pro- motes the velocity of establishing a model, plus remarkably improving the precision of prediction of satel- lite clock error, and complying with the requirement of GPS .fast single point positioning. It also applies gray model GM（1,1） to analyzing the precision of atomic clocks on different kinds of satellites, and con- cludes that the precision and stability of Rb clock is better than that of Cs clock.

关 键 词：灰色模型 GM(1 1) 精度分析 卫星钟差预报 原子钟精度 

分 类 号：P228[天文地球—大地测量学与测量工程]