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对于静止轨道三轴稳定卫星,天线的指向精度是用户要求的重要指标.在卫星定点后处于工作姿态时,要求天线波束覆盖用户规定的地面区域,并满足规定的电性能指标.卫星的姿态、轨道、天线性能和总装等误差对赋形天线的指向精度均具有一定的影响.本文对影响赋形天线指向精度的各类误差的形成原因、误差数据的计算方法进行了逐项分析.研究了各类误差对赋形天线指向精度的影响,其中重点分析了姿态和轨道误差的影响,给出了相应的算法公式,并基于实际工程数据进行了算例仿真,得到卫星在正常和位保两种模式下赋形天线的指向误差数据.通过对比,仿真计算结果与卫星在轨天线方向图的实测结果具有一致性,证明了该分析思路和计算方法的有效性和正确性.
For the stationary orbit three-axis stable satellite, the pointing accuracy of the antenna is an important requirement of the user’s requirements.When the satellite is in the working posture after pointing, the antenna beam is required to cover the user-defined ground area and meet the specified electrical performance index.Satellite attitude, The errors of the track, the antenna performance and the assembly error all have a certain influence on the pointing accuracy of the antenna. In this paper, the causes of the error of the various types of errors that affect the pointing accuracy of the antenna are analyzed one by one. Various types of errors affect the pointing accuracy of the antenna. The influence of the attitude and the trajectory errors is analyzed. The corresponding algorithm formulas are given. The simulation results are given based on the actual engineering data. By contrast, the simulation results are consistent with the measured results of satellite orbit antenna patterns, which proves the validity and correctness of the analysis ideas and calculation methods.