摘要：
资源三号01星与02星作为我国重要的遥感立体测绘卫星,承担了地理产品生产以及国土资源调查等任务.其中,高精度的卫星轨道确定是完成卫星任务的必备条件.资源三号01星与02星都搭载国产双频GPS接收机和SLR反射器来进行精密定轨和独立定轨精度检核.在定轨过程中,星载GPS接收机天线的PCO误差和PCV误差是制约进一步提高定轨精度的重要因素.尽管卫星入轨前获取GPS接收机天线的PCO先验值,本文通过在轨估计PCO,分析了PCO各个方向上的分量估计的可行性,发现通过使用在轨PCO,SLR检核显示ZY-301星和ZY-302星轨道RMS值分别提高了0.331 mm、0.399 mm.本文利用直接法和残差法估计了两颗卫星星载GPS接收机天线的PCV模型,整体量级在[-15 mm 15 mm].通过使用在轨估计的PCV模型(10°×10°),ZY-301星SLR检核结果RMS值提高了2.143 mm(直接法模型)、1.628 mm(残差法模型),重叠弧段对比在三维位置上提高了11.377 mm(直接法模型)、13.903 mm(残差法模型),ZY-302星SLR检核结果RMS值提高了0.727 mm(直接法模型)、0.692 mm(残差法模型),重叠弧段对比在三维位置上提高了1.736 mm(直接法模型)、1.548 mm(残差法模型).本文进一步探讨了PCV模型分辨率(10°×10°,5°×5°,2°×2°)对精密定轨的影响,在综合考虑计算效率、存储空间、提高幅度等因素后,发现使用残差法在轨估计5°×5°PCV模型是较好的选择.%ZY-301 and ZY-302 satellites,as important remote sensing stereoscopic mapping satellites in China,undertake the tasks of production of geographic products,land resource investigation and so on. Precision orbit determination(POD)is a prerequisite for the success of ZY-301 and ZY-302 missions.Dual-frequency GPS receiver and SLR reflector manufactured by China play significant roles in POD and independent orbits checkout.Although PCO priori values were obtained before satellites launched,by PCO estimation in-flight,this paper analyses the feasibility of PCO in different directions and finds ZY-301 and ZY-302 SLR RMS checkouts are improved 0.331 mm,0.399 mm respectively.Further,this paper estimates PCV models of ZY-301 and ZY-302 spaceborne GPS antennas using direct approach and residual approach and their PCV models can reach [-15 mm 15 mm].Through the use of PCV models(10°×10°),ZY-301 orbits SLR checkouts are improved 2.143 mm (direct approach),1.628 mm (residual approach),orbit accuracy in 3D of overlapping arcs are improved 11.377 mm (direct approach),13.903 mm (residual approach),ZY-302 orbits SLR checkouts are improved 0.727 mm (direct approach),0.692 mm (residual approach),orbit accuracy in 3D of overlapping arcs are improved 1.736 mm (direct approach),1.548 mm (residual approach).The effect of PCV model resolution (10°×10°,5°×5°,2°×2°)on POD is further discussed in this paper.After comprehensive consideration of computational efficiency,storage space,increase amplitude and other factors,5°×5°PCV model by residual approach is the best choice.
