基于频谱包络自相关的ISAR转角估计方法  

Estimating method for the rotation angle of ISAR image based on spectral envelope correlation

作　　者：张昆帆[1] 裴喜龙[2] 党同心[1] 张雅歌[1] 

机构地区：[1]解放军信息工程大学导航与空天目标工程学院,河南郑州450001 [2]解放军信息工程大学信息系统工程学院,河南郑州450001

出　　处：《系统工程与电子技术》2014年第8期1511-1516,共6页Systems Engineering and Electronics

摘　　要：逆合成孔径雷达(inverse synthetic aperture radar,ISAR)成像中,为了对目标进行方位向定标和距离徙动校正,需要估计雷达与目标的相对总转角。在对Dechirp回波数据分析的基础上,提出了一种基于频谱包络相关的转角估计方法。与相位对消法相比,所提算法无需知道目标大小等先验信息,且具有更好的鲁棒性。通过对两个不同时刻信号频谱包络的相关,估计出方位向回波信号的二次项系数,并采用加权最小二乘对估计结果进行拟合,完成了对转角快速准确的估计,仿真实验证明了该方法的有效性。In inverse synthetic aperture radar （ISAR）imaging,the rotation angle of object is required to re-move the phenomena of the migration through resolution cell and scale the cross range of the image.The phase character of the Dechirp data is analyzed in detail and a new method based on spectral envelope correlation for estimating the rotation angle is proposed.Compared with the phase cancellation method,the proposed algorithm does not needs to know the priori information of the target such as its size,and has better robustness.The coef-ficient of the quadratic phase term based on the correlation of the short-time Fourier transform （STFT）data is estimated,and the weighted linear least squares algorithm is used to improve the exactness of the result.Final-ly,simulation results verify the effectiveness of the method.

关 键 词：逆合成孔径雷达成像 频谱包络相关 转角估计 方位向定标 

分 类 号：TN958[电子电信—信号与信息处理]