【作者】 任冬晨；

【导师】 张守融；

【作者基本信息】 中国科学院研究生院（电子学研究所） ， 信号与信息处理， 2003， 硕士

【摘要】 双站合成孔径雷达(简称双站SAR)是一种新的成像雷达体制。在简要介绍了合成孔径雷达的成像原理后，本文着重从原理方面对双站SAR进行了分析，讨论双站SAR的方位向分辨率，测绘带宽，聚焦深度，脉冲重复频率限制，雷达方程等问题，然后对发射机固定的双站SAR这种特殊的双站SAR模式进行分析。 相位同步问题是双站SAR的一个关键技术问题，本文提出用直接同步法和间接同步法解决，并着重讨论了两种方法中可能出现的一次相位误差、二次相位误差、正弦相位误差对成像的影响。 发射机固定的双站SAR的典型应用是用原有的海岸警戒雷达和飞行平台上的接收机组成成像雷达，主要用途是对海面船只成像，因此必须解决在此种情况下对运动目标成像的问题。本文分析了发射机固定的双站SAR情况下的运动目标回波信号模型，应用WVD变换对发射机固定的双站SAR回波的多普勒信号参数进行估计，并采用WVD-Radon变换来抑制WVD的交叉项，以调整滤波器参数，实现发射机固定的双站SAR对运动目标聚焦成像。 对以上分析均给出计算机仿真结果予以验证。更多还原

【Abstract】 Bistatic Synthetic Aperture Radar (Bistatic SAR) is a new system of imaging radar. This paper’s study is focused on the principle of Bistatic SAR on the basis of giving a brief introduction of SAR principle, including azimuth resolution, mapping width, focusing deepness, pulse repetition frequency limitation and radar equation etc. Then the paper studies the special form of Bistatic SAR with stationary transmitter.The paper gives two ways to solve the Phase synchronization, which is a key technology to Bistatic SAR, namely direct synchronization and indirect synchronization. Meanwhile, the paper also studies the affection of linear phase error, quadratic phase error and sine phase error which are engendered by the method mentioned of the paper upon imaging.The typical use of bistatic SAR with stationary transmitter, which is made up of the original coast guardian radar and the receiver on the aircraft, is imaging sea vessels. Therefore, it is necessary to solve the problem of moving target imaging. This paper studies the characteristic of scatter from moving target in the situation of bistatic SAR with stationary transmitter. The WVD method is used in the paper to estimate the Doppler frequency parameter of the moving targets; the WVD-Radon method is used to restrain the cross-term. Then we can use the result to adjust the parameter of the filter, and to achieve the moving targets imaging of bistatic SAR.The results of computer simulation are given to demonstrate that the conclusion of the paper is correct.更多还原