机载双天线InSAR基线的工程设计与验证技术研究  

Engineering design and verification of the baseline for airborne dual-antenna InSAR

作　　者：沈汀[1] 耿俊杰 孙瑞宝[1] 

机构地区：[1]中国科学院对地观测与数字地球科学中心,北京100094 [2]陕西爱维森航空工程有限公司,西安710065

出　　处：《高技术通讯》2013年第8期773-780,共8页Chinese High Technology Letters

基　　金：863计划(2007AA120301)资助项目

摘　　要：针对机载双天线InSAR系统在1:10000地形测图中的要求,研究了干涉基线的工程设计与技术验证方法。给出了基线长度为2.3m,稳定精度达到0.1mm的外挂平板短梁设计方案,按照工程实现要求,完成了误差分析、指标论证、方案设计、气动及结构特性计算、地面测试与试飞验证。实际测图精度检验结果表明:外挂平板短梁方案采用匀速等高飞行方法,可以实现优于0.1mm的基线稳定要求。处理生成的数字表面模型和数字正摄影像图产品的检查点统计误差表明:平面和高程中误差分别达到1.203m和0.526m,可以满足1:10000地形测图精度要求,在机载干涉SAR系统的工程研制和实用化方面具有重要应用价值。The engineering design of the baseline and its verifying analysis for airborne dual-antenna InSAR were presented according to the requirements of 1 ∶ 10000 scale topographical maps.The equipment of ＂external flat short beam for the aircraft＂ was developed and applied to measuring the digital surface modes （DSM）.The topographical accuracy based on the experimental data indicates that the baseline can reach 2.3m when using external flat short beam while the error is less than 0.1 mm with the uniform speed and altitude,the accuracy of DSM＆DOM （digital orthophoto map） meets the demands of 1 ∶ 10000 terrain maps and the mean square error in plane is 1.203 meters and 0.526 meters in elevation.It demonstrates that the engineering design of the baseline is important and valuable for the extensive application of airborne dual-antenna InSAR.

关 键 词：机载干涉合成孔径雷达 双天线 1∶10000地形测图 干涉基线 基线精度 

分 类 号：TN958[电子电信—信号与信息处理]