移变双基前视合成孔径雷达空变运动补偿方法研究

项目名称： 移变双基前视合成孔径雷达空变运动补偿方法研究

项目编号： No.61301273

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： 李文超

作者单位： 电子科技大学

项目金额： 26万元

中文摘要： 移变双基前视合成孔径雷达（Translational Variant Bistatic Forward-Looking SAR, 简写TV-BFSAR），是一种收发站分置于不同平台且平台速度不同，接收站波束前视照射的新体制雷达，在飞行器自主着陆、自主导航等遥感领域具有重要的应用价值。然而，由于接收波束前视照射及收发平台速度差异，回波规律呈现大距离徙动、强方位空变特点，致使现有运动补偿不再适用，高分辨前视成像存在困难。 本项目将围绕TV-BFSAR回波大距离徙动、强方位空变特点，研究TV-BFSAR空变运动补偿，引入Keystone变换、非线性调频变标及最优化等理论与方法，构建TV-BFSAR复杂运动误差模型，突破前视空变距离徙动校正、空变高阶多普勒参数均衡等关键技术，形成拥有自主知识产权的TV-BFSAR空变运动补偿方法，为推动TV-BFSAR系统的研制与应用奠定理论与技术基础。

中文关键词： 双基SAR；前视成像；运动补偿；参数估计；空变

英文摘要： Translational Variant Bistatic Forward-Looking Synthetic Aperture Radar (TV-BFSAR) is a new radar system of which the transmitter and receiver are placed on different platforms with different velocities. The receiver works in forward-looking mode. TV-BFSAR is of great importance in the application of remote sensing, such as aircraft autonomous landing and autonomous navigation. However, there is large range migration and strong azimuth variance for the echo of TV-BFSAR due to forward-looking mode and the velocity difference between transmitter and receiver, large range migration and strong azimuth space variance exist in the echo of TV-BFSAR. Hence, the existed motion compensation methods cannot be applied in TV-BFSAR, which brings difficulty to high resolution imaging of forward-looking terrain. Focused on characteristics of large range migration and strong azimuth space variance, this project will study space variant motion compensation of TV-BFSAR. By building the complex motion error model and introducing the theory and methods, such as Keystone transform, nonlinear chirp scaling and optimization, a breakthrough in the key technologies of forward-looking space variant range migration correction and space variant high-order Doppler parameter equalization will be achieved. Hence, the methods of TV-BFSAR space

英文关键词： Bistatic SAR；Forward-Looking Imaging；Motion Compensation；Parameter Estimation；Space Variant