中文摘要：

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.

英文摘要：

In order to improve the accuracy and practicality of interferometric synthetic aperture radar（InSAR）baseline estimation methods without control point information and precise orbit data,the digital elevation model（DEM）assisted zero intermediate frequency baseline estimation method was proposed in this paper,based on the idea of zero intermediate frequency vector filtering.Firstly,satellite orbital method was used to estimate initial baseline.Secondly,the interferogram was simulated by means of the initial baseline and DEM,which made the difference with the original interference.Finally,fast Fourier transformation（FFT）estimation method was used to estimates residual baseline for differential interferogram,and the result was made as a correction value to iteratively correct baseline,until a two-dimensional center frequency of differential interferogram was close to 0.Two sets of ENVISAT ASAR data about Lanzhou and BAM regions were tested.The results show that this method can effectively estimate baseline,and obtain similar baseline parameters by precision orbit estimation method,and have the advantages of not depending on precise orbital parameters and control point information.