灰色模型在快速卫星钟差预报中的应用  

Grey system model for the ultra-rapid satellite clock error predicting

作　　者：李玮[1] 程鹏飞[1] 秘金钟[1,2] 

机构地区：[1]中国测绘科学研究院,北京100039 [2]武汉大学测绘学院,武汉430079

出　　处：《测绘科学》2010年第3期43-45,共3页Science of Surveying and Mapping

基　　金：科技部导航领域863项目(2007AA12Z313;2006AA12Z306);国家基础测绘项目(1469990624202)

摘　　要：GPS实时精密单点定位需要实时的、精确的、可靠的预报卫星钟差预报,因此卫星钟差的预报是一项非常重要的工作,它对实时的高精度导航定位具有重要意义。为导航定位提供时间标准的导航卫星原子钟是非常精密的仪器,对外界环境非常敏感,无法将卫星钟差作为普通的白噪声处理,可以但可将卫星钟差看作是灰色系统来进行研究。本文根据灰色系统相关理论,将灰色系统模型GM(1,1)应用到卫星钟差的预报,并用IGS超快速星历建立了预报卫星钟差的灰色预测模型,研究了卫星钟差的变化规律。结果表明:灰色模型可用于卫星钟差的短期预报,它对超快速星历的预报精度与IGS产品中的IGU超快速星历本身的预报精度相当。GPS real time precise point positioning （ RT- ） requires real-time, accurate and reliable prediction of satellite clock biases （ SCBs）. This is one of the most challenging tasks in the development of a RT- technique. The satellite atomic clock provicting time standard for navigation is a precise instrument and sensible to environment. It is supposed to regard satellite clock bias as grey model. Based on the grey system theory, the grey system model GM （ 1 , 1 ） was applied in establishing a grey predicting model by making use of IGS ultra-rapid products. Calculating results showed that grey model was fit for satellite clock bias short-term predicting, the predicting accuracy of satellite clock bias with uhra-rapid products was comparable with IGU products.

关 键 词：灰色系统 卫星钟差预报 IGS超快速星历 实时精密单点定位 

分 类 号：P228.1[天文地球—大地测量学与测量工程]