摘要
ISAR成像中 ,为补偿散射点距离单元走动现象和横向定标 ,需已知目标与雷达相对总转角 .实际ISAR成像中的转角通常是未知的 .本文提出采用RAT方法 ,在不同纵向距离单元信号的模糊平面上检测线性调频信号的调制率 ,从而估计得到总转角 .仿真和实测数据的成像结果证明了该方法的有效性 .
In ISAR image technique,the rotation angle of the object is required to remove the phenomena of the migration through resolution cell and scale the cross range of the image.In this paper,a novel method for estimating the rotation angle is proposed.The core idea of this method is to use the Radon ambiguity transform (RAT) technique to estimate the FM rate of the multiple linear frequency modulated signals in different range cells.Then,the rotation angle can be obtained from the FM rate easily.The effectiveness of the method is confirmed by the simulation and the experimental results.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2000年第6期44-47,共4页
Acta Electronica Sinica
关键词
逆合成孔径雷达
成像
转角估计
inverse synthetic aperture radar(ISAR)
rotation angle estimation
radon ambiguity transform (RAT)
linear frequency modulated signal
