【作者】 王森根；

【导师】 王俊；

【作者基本信息】 西安电子科技大学 ， 信号与信息处理， 2006， 硕士

【摘要】 论文研究了多发单收模式,即多个不同电视台信号和一个特定位置接收机组成的无源雷达系统对空中非合作目标成像的系统结构和基本原理。在此基础上,提出了一种基于二维傅立叶变换的无源雷达成像算法。该算法基于目标散射点模型和转台模型,当目标运动时,利用接收到的电视信号回波数据,可以推导出所得到的回波数据是关于目标散射函数二维傅立叶变换的采样值,因此成像的过程即对回波数据经过坐标变换和二维插值等预处理后,利用二维傅立叶变换来重建目标的散射函数分布。仿真中,分别利用12个电视台信号在目标转动30度和利用10个电视台信号在目标转动11度两种典型情况下进行了成像实验,取得了较好的成像效果,验证了本文所提算法的可行性。另外,论文还对多发单收模式下各参数对成像算法性能的影响进行了分析和仿真,并探讨了基于电视信号等外辐射源的无源雷达成像的若干关键技术。更多还原

【Abstract】 The configuration and basic principle of passive radar imaging of non-cooperative target are investigated by using multiple TV station signals and one receiver at a certain location. An imaging algorithm based on two-dimensional Fourier transform is proposed. In this algorithm, based on scatterers and turntable models, as the target moves, the receiver collects data of TV station signals reflected from the target. It can be deduced that this echo data is the sample of two-dimensional Fourier transform of the target scattering function. Taking some preprocessing like coordinate conversion, selecting a suitable interpolation area and two-dimensional interpolation, then the target image could be reconstructed through two-dimensional Fourier transform. The simulations are performed using 12 TV station signals when the target rotates 30 degrees and using 10 TV station signals when the target rotates 10 degrees, respectively. With well-reconstructed target images, the simulation results show the effectiveness of the proposed algorithm. Furthermore, in the model of multiple transmitter and single receiver the influence of passive radar system parameters on the algorithm performance is analyzed and simulated. Finally, several key techniques about passive radar imaging based on external illuminators like TV signal are discussed.更多还原