项目名称: 高精度柔性基线双天线干涉SAR运动补偿方法研究
项目编号: No.61302133
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 无线电电子学、电信技术
项目作者: 王静
作者单位: 西安科技大学
项目金额: 24万元
中文摘要: InSAR技术对国民经济发展和国家战略安全起着举足轻重的作用,增加干涉基线长度可以提高干涉性能,但柔性基线结构产生的运动误差严重影响雷达成像质量和干涉测量精度。本课题针对双天线干涉SAR中柔性基线的抖动、伸缩等非刚性特征,重点对干涉SAR回波仿真算法、运动建模与滤波方法、高精度运动补偿技术展开深入研究。建立了基线抖动模型和相干性能模型,分析了基线抖动对干涉性能的影响,并根据测量的基线矢量数据,对运动误差进行建模,通过非线性滤波方法获得精确的基线矢量,并把这些误差引入回波信号进行仿真分析。重点从信号仿真分析和实验数据验证两种方式对其运动补偿后的干涉性能进行评估。研究算法及分析结论对后续整个系统论证具有重要意义。
中文关键词: 双天线干涉SAR;柔性基线;精密测量;非线性滤波;运动补偿
英文摘要: InSAR technique plays a significant effect in the development of the national economy and the stratagem safety, the high precision Digital Elevation Mode(DEM) can be obtained by increasing the length of baseline。The quality of radar imaging and interferometry accuracy is affected seriously by motion errors,as the deformation and jitter by the non-rigid baseline. For the jitter feature of non-grid baseline,it focus on the interferometric SAR echo simulation algorithm, motion modeling and nonlinear filtering, high-precision motion compensation.Based on jitter model of non-grid baseline, coherent performance model, the effect to interferometric performance by baseline jitter is analysis. The accurate baseline vector is obtained by non-linear filtering based on motion error model.The interference performance through motion compensation is validated both by signal simulation analysis and experimental test. The conclusions is important to the follow system demonstration.
英文关键词: Dual-antenna InSAR system;non-grid baseline;accurate measurement;nonlinear filtering;motion compensation