CAJ | 학술논문

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。
역합성공경뢰체（inverse synthetic aperture radar，ISAR）성상중，위료대목표진행방위향정표화거리사동교정，수요고계뢰체여목표적상대총전각。재대 Dechirp 회파수거분석적기출상，제출료일충기우빈보포락상관적전각고계방법。여상위대소법상비，소제산법무수지도목표대소등선험신식，차구유경호적로봉성。통과대량개불동시각신호빈보포락적상관，고계출방위향회파신호적이차항계수，병채용가권최소이승대고계결과진행의합，완성료대전각쾌속준학적고계，방진실험증명료해방법적유효성。
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.