重轨低频超宽带合成孔径雷达干涉测量关键技术研究

项目名称： 重轨低频超宽带合成孔径雷达干涉测量关键技术研究

项目编号： No.61201329

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 安道祥

作者单位： 中国人民解放军国防科学技术大学

项目金额： 26万元

中文摘要： 低频超宽带合成孔径雷达（UWB SAR）具有穿透叶簇对丛林隐蔽目标成像探测的能力，因此基于低频UWB SAR的重轨干涉测量技术（UWB InSAR）可对叶簇覆盖下的隐蔽地形进行高精度测绘。然而，由于工作频段低、相对带宽大、合成孔径长等特点，重轨低频UWB InSAR需要解决复杂射频干扰（RFI）的保相抑制、长合成孔径下的残余运动误差补偿、空间耦合波数谱滤波预处理等特殊难点问题。为此，本项目从仿真模拟和实测数据分析着手，建立能够准确描述重轨低频UWB InSAR复杂RFI信号、残余运动误差和空间耦合波数谱的数学模型，然后基于所建模型提出针对上述难点问题的解决方法。研究过程中，将利用重轨低频UWB SAR实测数据对所研究算法的有效性进行反复验证，并根据验证结果对所提算法进行改进和完善。本项目研究将为提高重轨低频UWB InSAR对叶簇隐蔽地形的测绘精度典型基础，推动该项技术的实用化进程。

中文关键词： 低频；超宽带干涉合成孔径雷达；成像处理；图像配准；相位解缠

英文摘要： The low frequency ultrawide band synthetic aperture radar (UWB SAR)has excellent foliage penetration capability and can detect the objects under the foliage.Therefore, the repeat-pass low frequency UWB SAR interferometry (UWB InSAR)technique can perform topographic mapping of the ground beneath the foliage. However, due to the lower carrier frequency and the larger relative bandwidth ratio as well as the longer synthetic aperture length, several special difficult problems need to be resolved when working with the repeat-pass low frequency UWB InSAR data. The problems includes the phase preserving method of radio frequency inteference (RFI) suppression, the residual motion error correction under the long synthetic aperture length and the filtering preprocessing of spatial coupling wavenumber spectral. In this research, based on the analyses results of the simulated and real data, the higher accuracy math models of the residual motion error and the complicated RFI signal as well as the spatial coupling wavenumber spectral are built, respectively. Then, the resolutions for overcoming above-mentioned problems will be proposed based on the built math models. In the research process, the repeat-pass low frequency UWB SAR raw data will be used for testing the validity of the proposed algorithms. According to the test r

英文关键词： low frequency；UWB InSAR；Imaging processing；Image registration；phase unwrapping