摘要
相比于传统SAR卫星应用方向,我国第一代L波段差分干涉SAR卫星主要用于实现全球精准地表形变测量。为了达到重轨差分干涉优于5 cm的形变测量指标,首先需要解决卫星空间基准轨道高精度回归的工程难题。对此,本文提出一种严格回归轨道优化设计方法,通过地球重力场阶数需求分析建立卫星高阶动力学模型,将J4摄动下修正的太阳同步回归轨道参数作为优化算法初值,以卫星WGS-84坐标系位置、速度回归精度满足收敛阈值为目标,利用启发式多目标进化算法开展轨道参数寻优。仿真试验表明,寻优结果回归精度可达厘米级,优于既定工程指标,并且本文方法有效性和正确性已经过L波段差分干涉SAR卫星在轨验证。
Compared with the traditional application direction of SAR satellites,the first generation of China s L-band differential interferometric SAR(L-SAR)satellite is mainly used to realize global accurate surface deformation measurement.In order to achieve the deformation measurement index of heavy-orbit differential interferometry better than 5 cm,it is necessary to solve the engineering problem of high-precision regression of satellite reference orbit.In this paper,a precision reference repeating orbit optimization design method is proposed.The high-order dynamic model is established by analyzing the impact of gravity field with different complexities on the precision of regression orbits;The modified sun-synchronous regression orbit parameters achieved by taking into account J4 perturbation are used as the initial value for the algorithm,and carry out the orbit optimization by using a heuristic multi-objective evolutionary algorithm with the goal of satisfying the convergent domain value of the satellite s position and velocity regression accuracy in the WGS-84 coordinate system.Simulation tests show that the regression accuracy of the optimization results can reach centimeter level,which is better than the established engineering indexes,and the validity and correctness of the method have been verified by L-SAR satellites in orbit.
作者
李楠
温俊健
刘艳阳
凌惠祥
魏春
陈筠力
LI Nan;WEN Junjian;LIU Yanyang;LING Huixiang;WEI Chun;CHEN Junli(Shanghai Institution of Satellite Engineering,Shanghai 201109,China;Shanghai Academy of Spaceflight Technology,Shanghai 201109,China)
出处
《测绘学报》
EI
CSCD
北大核心
2024年第10期1873-1880,共8页
Acta Geodaetica et Cartographica Sinica
基金
国家重点研发计划(2021YFC3000405)。
