CAJ | 학술논문

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。
정궤시지구탐측위성임무순리집행적관건。성재GPS기술제공료대량、련속적고저위성근종관측,위저궤위성정밀정궤제공료기술지탱。위료학정CHAMP위성적궤도,병분석정궤정도,이용CHAMP위성성재GPS수거,운용령차간동역법진행정밀정궤,급출료정밀정궤류정。이용실제수거진행료정밀정궤실험,결과여덕국지학연구중심（GFZ）공포적CHAMP위성쾌속궤도（RSO）진행료대비,결과현시：구해궤도가이체도전미량급。
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.