摘要
从距离-多普勒成像算法入手,分析了距离徙动校正的过程,指出方位移频干扰在忽视SAR系统二维耦合特性的条件下,会引入距离徙动校正的误差。通过视角与多普勒的紧密关系,推导了以视角作为自变量的移频干扰距离徙动校正误差表达式,分别对各种变量关系下误差量、距离包络分布形式进行了讨论,并给出了方位频移干扰能够正确方位聚焦的频移区间。最后的仿真结果验证了本文内容的正确性,为移频干扰的工程实现和应用提供有力参考。
The shift-frequency jamming is an important class of jamming to SAR. Some papers have studied on it and hope to achieve deception jamming through simple Doppler modulation. But all these studies are on the hy-pothesis that the SAR system response is two dimensions separable, i.e. it can be considered as range response and azimuth response separately. The model is build under the circumstance that the range cell migration is not neglect-able. It starts at the Range-Doppler algorithm and analyzes how the range cell migration correction is carried out in range-Doppler domain. Then it reaches a conclusion that the RCMC will introduce errors when shift-frequency jam-mer works. The expression of the error is presented by the angle of radar＇ s line of sight, and how the error varies with some parameters change is also discussed. Finally, the maximum shift-frequency is given for jamming to achieve correct azimuth focusing. At the end, simulations are implemented to verify the conclusion and discussions. Those may give a strong reference for the realization and implementation of shift-frequency jamming.
出处
《科学技术与工程》
北大核心
2014年第2期122-126,共5页
Science Technology and Engineering
