低轨小椭圆轨道S频段SAR卫星姿态导引方法研究  

Study on S-Band SAR Attitude Steering Method In Small Elliptic LEO

作　　者：郑泽星[1] 刘洋[1] 蒙薇[1] 刘娅楠 辛强[1] ZHENG Zexing;LIU Yang;MENG Wei;LIU Yanan;XIN Qiang(DFH Satellite Co.Ltd,Beijing 100094,China)

机构地区：[1]航天东方红卫星有限公司

出　　处：《空间电子技术》2019年第5期1-6,共6页Space Electronic Technology

基　　金：国家青年科学基金课题(41706204)

摘　　要：国内外针对S频段SAR卫星姿态导引研究较少,在考虑轨道偏心率和系统天线指向误差情况下尚无明确的导引策略。基于合成孔径雷达(SAR)成像模型及椭圆轨道动力学理论,引入椭圆轨道的径向速度和法向速度分量,推导得到了椭圆轨道任意位置上多普勒中心频率的新的数学表达及分量分解。提出了面向低轨小偏心率轨道S频段合成孔径雷达(SAR)卫星的偏航导引、二维姿态导引方法以及采取不同轨道模型时的简化实现,分析得到了不同补偿方法的补偿效果以及天线指向精度对补偿效果的影响。根据仿真结果,结合卫星工程实现和地面成像处理难度,提出了以偏航导引为主,二维导引为辅的姿态导引策略,对低轨小椭圆轨道S频段SAR卫星姿态导引设计具有指导意义。S-band SAR satellite Attitude Steering are new research derections and there is no clear guidance strategy considering orbit eccentricity and system-level antenna pointing erro.Doppler centroid fequeney expression is derived based on SAR imaging model and elliptic obit mechanics theory.Then radial velocity and normal velocity are introduced and Doppler centroid fequeney is decomposed into two sections.Base on the new Doppler centroid frequency expression,yaw steering and Two-dimensional Attitude Steering Methods along with its simplificaiton are deduced for small Elliptic LEO satellite.Then compensation effects coresponding to diffrent method and antenna pointing precision are analysised and compared.The simulation results indicate that yaw steering method is primarily necessary and Two-dimensional Attitude Steering Method is auxiliary supplement.The conclusion has important guiding significance for attitude Steering of S-band SAR satellite.

关 键 词：低轨 小偏心率 S频段 SAR卫星 姿态导引 

分 类 号：V474[航空宇航科学与技术—飞行器设计]