基于区域CORS的实时精密卫星钟差估计研究  

Precise Clock Error Estimation of GPS Satellite Based on Regional Reference Network

作　　者：高成发[1] 沈雪峰[1,2] 汪登辉[1] 赵毅 

机构地区：[1]东南大学交通学院,南京210096 [2]上海华测导航技术有限公司,上海200233

出　　处：《导航定位学报》2013年第1期40-46,共7页Journal of Navigation and Positioning

基　　金：国土资源部公益行业基金(201211001-08);863课题(2012AA12A209)

摘　　要：区域连续运行参考站网(CORS)的广泛建立,为实时精密单点定位(PPP)提供了良好的平台保证。根据区域参考站网络的特点,本文提出了基于星间单差与历元间差分相结合的卫星钟差估计组合模型,确定了基于组合模型的实时卫星钟差估计策略,结合卡尔曼滤波参数估计方法,实现了区域1s采样间隔的精密卫星钟差数据的生成。通过重庆CORS的数据验证,表明该模型实时绝对卫星钟差和相对卫星钟差的精度均优于0.2ns,与国际IGS各分析中心估计的卫星钟差精度相当,满足了卫星钟差实时性的要求。该计算方法不仅可以用于CORS网本区域而且还可以用于距离CORS区域达数百公里以外的地区进行实时定位,这对于实时精密单点定位技术的实现具有重要意义。A good and guaranteed platform is provided for realization of the real-time Precise Point Positioning (PPP) by the widely establishment of Continuously Operating Reference Stations (CORS).An approach for real-time estimating the satellite clock is presented,based on satellite single difference and satellite-and epoch-difference clock observation model using regional reference network.The model can generate precise satellite clock error in one-second sampling interval.The performance of the proposed method was demonstrated through the-study examples from Chongqing CORS.It is proved that the precision of real-time satellite clock error and relative satellite clock error of the model are both superior to 0.2ns,which is equivalent to the estimated precision by the international IGS analyzing center,and have met the requirement of real-time satellite clock difference.It is also shown that the estimated real-time satellite clock error not only can be used for its own area in the CORS network but also the area apart from the CORS region u Pto hundreds of kilometers.It has significance to realize the real-time precise point positioning technology.

关 键 词：精密卫星钟差 精密单点定位 区域参考站网络 

分 类 号：P228[天文地球—大地测量学与测量工程]