一种双天线SAR运动目标成像系统仿真  

Dual-Channel SAR Moving-Target Imaging System Simulation

作　　者：黄瑶[1,2] 雷宏[1] 夏玉立[1,2] 

机构地区：[1]中科院电子所,北京100190 [2]中科院研究生院,北京100049

出　　处：《系统仿真学报》2009年第15期4772-4776,共5页Journal of System Simulation

摘　　要：提出了一种DPCA联合MDCFT的双天线SAR运动目标成像系统。将MDCFT变换应用于经过DPCA杂波对消后的信号,在MDCFT幅值平面内同时完成对运动目标的检测和多普勒参数的估计。建立了适合SAR系统的MDCFT模型,对杂波对消后回波数据的MDCFT幅度值分析证明了该方法的可行性``和有效性。在分数阶傅立叶域进行滤波以消除杂波对相位的影响,进而利用通道间的相位差和多普勒中心频率对运动目标准确定位。利用大量的仿真实验对该系统的功能进行了验证。A dual-channel SAR moving-targets imaging method via DPCA （Displaced Phase Center Antenna） joint MDCFT （Modified Discrete Chirp-Fourier transform） was proposed. MDCFT was applied to the DPCA output signals after which detection and parameter estimation could be solved simultaneously. The MDCFT model was established fitting for SAR system. An analysis about the MDCFT amplitude of the received signals after clutter suppression was made to demonstrate the validity of the method. The effect of phase caused by clutter was eliminated by filtering in the fractional Fourier domain. The exact position of the moving target was estimated via the channel phase difference and the Doppler center frequency. The method is proved to be effective and correct by simulation results.

关 键 词：合成孔径雷达 运动目标成像 修正的离散Chirp-Fourier变换 相位中心偏置天线 线性调频信号 参数估计 分数阶傅立叶域 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]