摘要
弹载SAR沿曲线轨迹飞行,成像算法与常规机载正侧视SAR不同。文中从脉冲压缩信号时延和频移强耦合特性入手,结合弹载SAR的前斜视RD成像算法,推导了弹载SAR的移频干扰输出形式。结果表明,方位维的位移量和移频量不成线性关系,但在较小的移频量范围内可近似认为成线性关系;方位移频和距离移频同时作用,可形成二维联合移频干扰,提高了干扰的灵活性,仿真验证了结论的正确性。
Missile-borne SAR moves along curve locus. Its imaging algorithm is different from normal air-borne SAR. On the basis of the inherent coupling property between time delay and frequency shift of the pulse compression signal, this paper deduces the output form of shift-frequency jamming on missile-borne SAR based on the missile- borne squint SAR algorithm. The results show that orientation-dimensional displacement and the amount of frequency shift do not have a linear relationship, but to a lesser extent they approximate a linear relationship. Orientation-di- mensional and range-dimensional shift-frequency can form two dimensional shift-frequency jamming when working at the same time, thus forming a flexible jamming pattern. Simulation verifies the correctness of the conclusions.
出处
《电子科技》
2012年第1期85-89,共5页
Electronic Science and Technology
关键词
移频干扰
弹载SAR
曲线轨迹
二维移频
前斜视RD算法
shift-frequency jamming
missile-borne SAR
curve locus
two dimensional shift-frequency
squint SAR algorithm
