基于星载GPS的CHAMP卫星精密简动力定轨  

Precise Orbit Determination of CHAMP with Reduced-dynamic Method based on Satellite-borne GPS Technique

作　　者：秦建[1] 郭金运[1,2,3] 孔巧丽[1,2,3] 李国伟[1] 

机构地区：[1]山东科技大学测绘学院,山东青岛266510 [2]中国科学院动力大地测量学重点实验室,湖北武汉430077 [3]海岛(礁)测绘技术国家测绘局重点实验室,山东青岛266510

出　　处：《全球定位系统》2011年第5期41-45,共5页Gnss World of China

基　　金：国家自然科学基金(40974004和40974016);中国科学院动力大地测量学实验室基金(L09-01);海岛(礁)测绘技术国家测绘局重点实验室基金(2009A02);山东科技大学科研创新基金项目(YCA110403)

摘　　要：定轨是地球探测卫星任务顺利执行的关键。星载GPS技术提供了大量、连续的高低卫星跟踪观测,为低轨卫星精密定轨提供了技术支撑。为了确定CHAMP卫星的轨道,并分析定轨精度,利用CHAMP卫星星载GPS数据,运用零差简动力法进行精密定轨,给出了精密定轨流程。利用实际数据进行了精密定轨实验,结果与德国地学研究中心(GFZ)公布的CHAMP卫星快速轨道(RSO)进行了对比,结果显示:求解轨道可以达到厘米量级。A great deal of continuous high-low satellite-to-satellite tracking observations can be collected with the satellite-borne GPS technique,which can be used to precisely determine orbits of low-earth-orbit satellites.CHAMP＇s precise orbit is determined from CHAMP′s satellite-borne GPS data with the zero-difference reduced-dynamic method,presents the processing of precise orbit determination and analyses the precision of orbit determintion.The experiment of precise orbit determination is done with the actual data.The result Compares with the post-processed science orbits of GFZ,and analyses the difference in X,Y,Z directions.The study shous that： the RMS difference in X,Y,Z directions are 0.053,0.054,and 0.050 m respectively.In general,the accuracy of the computed orbit is at centimeter level,and it reaches the required standard.

关 键 词：简化动力学 均方差 CHAMP 星载GPS技术 

分 类 号：P228.4[天文地球—大地测量学与测量工程]