DEM辅助的InSAR零中频处理基线估计方法

发布时间：2018-06-06 09:50

本文选题：合成孔径雷达干涉测量(InSAR) + 基线估计　；参考：《华中科技大学学报(自然科学版)》2017年03期

【摘要】：为了提高无地面控制点信息和精密轨道数据时合成孔径雷达干涉测量(InSAR)基线估计的精确性和实用性,借鉴零中频矢量滤波的思想,提出了数字高程模型(DEM)辅助的InSAR零中频处理基线估计方法.该方法利用卫星轨道法估计基线参数初值,并根据该基线参数值,由低精度DEM模拟覆盖区的干涉图,将模拟干涉图与原始干涉图做差分处理得到差分干涉图.以零中频为判别依据,对差分干涉图进行快速傅里叶变换(FFT)基线估计,获取基线参数初值的改正量,并修正基线参数初值,通过迭代直至差分干涉图的二维中心频率接近于0.利用甘肃兰州地区和伊朗BAM地区ENVISAT ASAR数据进行了验证,实验结果表明:利用该方法能有效进行基线估计,可得到与精密轨道基线估计方法相近的结果,具有不依赖于精密轨道参数和地面控制点的优势.
[Abstract]:In order to improve the accuracy and practicability of the baseline estimation of synthetic Aperture Radar (SAR) interferometry without ground control point information and precise orbit data, the idea of zero-intermediate frequency vector filtering is used for reference. A digital elevation model (DM) aided baseline estimation method for InSAR zero if processing is proposed. In this method, the initial value of baseline parameters is estimated by satellite orbit method. According to the baseline parameter value, the differential interferogram is obtained by differential processing between the simulated interferogram and the original interferogram by using low-precision DEM to simulate the interferogram in the overlay area. On the basis of zero if, the difference interferogram is estimated by fast Fourier transform (FFT) baseline. The correction of the initial value of the baseline parameter is obtained, and the initial value of the baseline parameter is corrected. The 2-D center frequency of the differential interferogram is close to 0 by iteration. The ENVISAT ASAR data of Lanzhou area and BAM area of Iran are used to verify the results. The experimental results show that the method can be used to estimate the baseline effectively and the results are similar to those of the precision orbit baseline estimation method. It has the advantage of independent of precision orbit parameters and ground control points.
【作者单位】：信息工程大学地理空间信息学院;
【基金】：国家自然科学基金资助项目(41071296;41474010;61401509) 国家高技术研究发展计划资助项目(2011AA120402;GFZX0404040803)
【分类号】：P237

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