摘要
在建立远场条件下双基地ISAR转台模型的基础上,阐述了双基地ISAR的成像原理。针对双基地ISAR系统中相对转角计算复杂的问题,给出了一种利用合多普勒带宽计算双基地ISAR方位分辨率的方法。详细分析了双基地ISAR系统的收、发分置结构对目标成像的影响,针对双基地ISAR系统中机动目标多普勒频率信息的时变特性,将基于时频分析技术的距离-瞬时多普勒成像算法引入双基地ISAR目标像的重建过程中。最后,仿真实验验证了算法的有效性。
A mount model of bistatic ISAR target in far-field is established,and then the principle of bistatic ISAR imaging is expatiated.Because the related rotating angle between the radar and the target is difficult to calculate in bistatic radar,a new method using the concept of sum Doppler for analyzing the cross-range resolution of bistatic ISAR is presented.The effect of bistatic ISAR image due to spatially separated radar geometries is analyzed in detail.According to the time-varying Doppler frequencies of the scatters on the target in bistatic radar,the range-instantaneous Doppler imaging algorithm is induced to the ISAR image reconstruction.Lastly simulations are given and the result shows the effectiveness of the algorithm.
出处
《现代雷达》
CSCD
北大核心
2011年第8期33-38,共6页
Modern Radar
基金
国家自然科学基金(60971100)
关键词
双基地雷达
逆合成孔径雷达
方位分辨率
距离-瞬时多普勒算法
重排平滑伪维格纳分布
bistatic radar
inverse synthetic aperture radar（ISAR）
azimuth resolution
range-instantaneous Doppler algorithm
reassigned smoothed pseudo Wigner-Ville distribution（RPSWVD）
