资源三号卫星激光测距定轨精度分析

Accuracy analysis of orbit determination with satellite laser ranging for ZY-3 satellite

基于卫星激光测距定轨是目前遥感卫星在轨位置测量的重要手段之一,其测量精度关系到遥感卫星的应用水平。为了分析我国首颗民用立体测绘卫星——资源三号携带的国产激光角反射器在轨运行情况,该文利用全球激光联测期间卫星激光测距数据与GPS事后联合定轨结果,从遥感影像几何定位和轨道预报两个方面定量分析和评价卫星激光测距参与的定轨精度。试验表明,基于卫星激光测距与GPS定轨结果,影像几何定位无控精度较实时定轨精度提升1~2m,有效提升了卫星影像几何处理精度;轨道预报1d星下点位置较实际过境轨迹偏差优于250m,2d优于500m,1d预报侧摆精度达到0.035°,满足检校外业和成像计划精度需求。

Satellite orbit determine based on satellite laser ranging（SLR）is an important mean of current remote sensing satellites on-orbit position measurements, and the measurement accuracy related to the application level. In order to analyze the on-orbit status of domestic laser corner reflectors carried by Chinese first civil three-dimensional surveying and mapping ZY-3 satellite, the orbit determination accuracy was quantitatively analyzed and evaluated with SLR from imagery positioning and orbit forecast by applying SLR data and GPS data afterwards combined orbit results during the global laser joint measurement. Experimental results showed that the accuracy of geometric positioning based on SLR and GPS without GCPs improved 1-2 m than real time orbit determination, which effectively increased the accuracy of satellite imaging geometry processing; the forecasted orbit nadir position was better than 250 m compared with actual transit trajectory deviation in one day, and better than 500 m in two days; the forecasted side swing accuracy reached 0. 035 degree in one day, which met the requirement of field calibration and image plan.