CAJ | 학술논문

空间目标大都尺寸较小，雷达的回波数据信噪比较低，在目标单元之外往往存在严重的噪声影响，使ISAR成像出现严重的散焦，有时甚至是无法成像，常规的补偿方法不再适用。在分析低信噪比影响的基础上，综合利用不同方法进行相位的估计，提出一种改进的基于图像评价准则的补偿方法对相位进行精确估计，有效地提高成像的聚焦质量。考虑噪声的迭代运算误差，利用信号的相关性，结合相干积累方法，区分噪声与目标单元，大大提高了运算的速度与图像聚焦的质量。实验结果证明了方法的有效性。
공간목표대도척촌교소，뢰체적회파수거신조비교저，재목표단원지외왕왕존재엄중적조성영향，사ISAR성상출현엄중적산초，유시심지시무법성상，상규적보상방법불재괄용。재분석저신조비영향적기출상，종합이용불동방법진행상위적고계，제출일충개진적기우도상평개준칙적보상방법대상위진행정학고계，유효지제고성상적취초질량。고필조성적질대운산오차，이용신호적상관성，결합상간적루방법，구분조성여목표단원，대대제고료운산적속도여도상취초적질량。실험결과증명료방법적유효성。
Most space targets are of smaller size and the signal to noise ratio ( SNR) of radar echo data is low as well. Serious noise influence often exists outside the target unit,leading to serious defocusing in ISAR imaging,sometimes even failure of imaging. Conventional compensation method is no longer applicable.Based on an analysis of the influence of low signal to noise ratio,different methods are used comprehensively for phase estimation. An improved compensation method based on image evaluation criteria is pro?posed to realize accurate phase estimation and effectively improve the focusing quality of imaging.Considering the iterative computation error noise,noise and target unit are distinguished by using the correlation of signals and combining with the method of coherent accu?mulation,and the speed of operation and the quality of image focusing are greatly improved. The experimental results demonstrate the effectiveness of the method.