测量船变形误差对轨道精度的影响分析

Analysis on Precision of Orbit about Influence of Hull Deformation Error for TT&C Ship

航天测量船执行测控任务时是在海上进行的,受风、浪、涌的影响,船体会产生扭曲变形,外测数据受变形的影响,必须修正后才能使用,变形误差对外测数据、定轨精度都有影响。为了分析变形误差对轨道精度的影响,进行了仿真试算,以任务中实际测量的变形角作为真实值,对其添加一定的误差后进行仿真,比较分别利用实测数据和仿真数据进行处理后的定轨结果,考察变形误差对轨道精度的影响。结果表明:变形误差是测量船的一项重要误差,其对地球同步卫星初轨的影响是百米级的,不可忽视,提高变形测量的精度,便能提高定轨的精度。

Space-tracking ships must face various complicated job-enviroment when carrying out a traking task. Com- pared with a TT＆C equipment on land, the error sources are more complex from equipments on ship, and the ge-sture error plays an important role in these sources. The hull deformation angel from the actual measurement is taken as a true value. After adding a fixed error to it, an simulation is carried on to compare the orbit results based on the true and simulated data. How the hull deformation error influences the orbit results is discussed to find that hull deformation error is an important er ror. Accuracy of the orbit measurement can be increased by controling the uncertainty of hull deformation.