地球同步轨道SAR定轨精度要求分析

发布时间：2018-03-06 12:20

  本文选题：地球同步轨道合成孔径雷达　切入点：定轨精度　出处：《系统工程与电子技术》2017年01期 　论文类型：期刊论文

【摘要】：针对地球同步轨道合成孔径雷达(geosynchronous synthetic aperture radar,GEOSAR)的技术特点和应用需求,进行定轨精度要求分析。首先建立GEOSAR定轨误差模型,定性分析定轨误差对斜距及多普勒频率的影响。然后针对全误差公式难以解析求解的问题,提出了一种基于蒙特卡罗法分析定轨精度的方法,并给出GEOSAR典型应用模式下的定轨精度分析流程。最后针对中等倾角GEOSAR给出定量的定轨精度要求。仿真表明,GEOSAR成像聚焦所需的径向位置精度为米级,切向速度精度为10-3 m/s量级,目标定位所需的切向位置精度为10m量级,径向速度精度为10-3 m/s量级,差分干涉所需的径向位置精度为毫米量级,并且下视角越小,约束越高。
[Abstract]:According to the technical characteristics and application requirements of geosynchronous synthetic aperture radar (GEOSAR), the requirements of orbit determination accuracy are analyzed. Firstly, a GEOSAR orbit determination error model is established. The influence of orbit determination error on oblique distance and Doppler frequency is analyzed qualitatively. Then, a method based on Monte Carlo method is proposed to analyze the orbit determination accuracy. The analytical flow of orbit determination accuracy in typical application mode of GEOSAR is also given. Finally, the quantitative orbit determination accuracy requirement for GEOSAR with medium inclination angle is given. The simulation results show that the radial position accuracy and tangential velocity accuracy are in meter order and 10 ~ (-3) m / s order of magnitude respectively, and the simulation results show that the radial position accuracy is of the order of m and the tangential velocity is 10-3 m / s. The tangential position accuracy is 10m, the radial velocity accuracy is 10-3m / s, the radial position accuracy is millimeter for differential interference, and the lower the angle of view is, the higher the constraint is.
【作者单位】： 中国科学院空间信息处理与应用系统技术重点实验室;中国科学院电子学研究所;中国科学院大学;
【基金】：国家自然科学基金(61331017,61101200)资助课题
【分类号】：TN958
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本文编号：1574810