小旋转角的逆合成孔径转台成像

在地面雷达成像中,目标经过运动补偿和相关处理后大都可以看作匀速转动的转台目标,所以分析转台目标的成像原理是对实际目标成像的基础。本文从理论上详细分析了采用线性调频波形去调频机制的小旋转角转台目标逆合成孔径成像的基本原理;给出了距离维和方位维的理论分辨率,推导出了距离维和方位维的成像尺寸与雷达参数的具体关系;为了和去调频距离维成像相比较,分析了距离维匹配滤波的成像原理,得出二者有相同分辨率的结论;最后针对理想点模型和圆台模型分别进行了计算机仿真,仿真结果证明了去调频成像结论的正确性。

ISAR Imaging of Rotating Target with Small Angles

ISAR imaging is an important topic in radar imaging.The imaging of rotating target with small angles is often used in many applications because it is very similar to practical targets after certain processes like motion compensation.The dechirp procedure of ISAR imaging is discussed in detail.And the relationships between the imaging sizes and theoretical resolution and the radar parameters are proposed as well.The range imaging by match filtering is presented for comparison and the conclusion is that they both have the same resolution.Finally,the models of ideal points and a frustum are made up to simulate and verify the theory of dechirp imaging