CAJ | 학술논문

在频率步进高分辨ISAR成像中，目标的径向运动会带来距离多普勒耦合，从而对ISAR图像有较大的影响。提出了一种基于图像对比度最优的运动参数估计方法。该法分析了径向速度和径向加速度对多普勒像对比度函数的影响。通过构造相位补偿因子，在多普勒像中基于多普勒像对比度最优估计径向加速度。在径向加速度补偿后，在距离像中基于距离像对比度最优估计径向速度。进行运动补偿，利用RD算法实现了目标的高分辨ISAR成像。该方法具有运动参数估计精度高和计算量小的优点。仿真结果验证了方法的有效性。
재빈솔보진고분변ISAR성상중，목표적경향운동회대래거리다보륵우합，종이대ISAR도상유교대적영향。제출료일충기우도상대비도최우적운동삼수고계방법。해법분석료경향속도화경향가속도대다보륵상대비도함수적영향。통과구조상위보상인자，재다보륵상중기우다보륵상대비도최우고계경향가속도。재경향가속도보상후，재거리상중기우거리상대비도최우고계경향속도。진행운동보상，이용RD산법실현료목표적고분변ISAR성상。해방법구유운동삼수고계정도고화계산량소적우점。방진결과험증료방법적유효성。
In stepped-frequency high resolution ISAR imaging radar,target motions produce the range-Doppler coupling which has a serious effect on the ISAR image.Consequently,a novel motion-parameters estimation method based on the image contrast optimization is proposed. Firstly,the effect of radical velocity and acceleration on Doppler profile contrast function was analyzed.Secondly,after constructing phase compensation term,the radical acceleration was estimated by the Doppler profile contrast function.After the radical acceleration compensation,the radical velocity was estimated by the range profile contrast function.Finally,after motion compensation and range-Doppler algorithm,the high resolution ISAR image was obtained.This method has some advantages of high accuracy and fast computation speed.The experimental results demonstrate the effectiveness of the proposed method.