摘要
多普勒参数的估计精度直接影响机载合成孔径雷达系统(SAR)成像质量。根据平均后的方位谱来估计多普勒中心频率,通过计算子图像之间的位移值来估计多普勒调频斜率。为了消除在实际应用中各种干扰的影响,采用了对原始回波数据加窗的方法来提高对估计的准确性。该算法的估计结果可以用于补偿载机运动误差引入的相位误差,从而实现高分辨率成像。通过使用实验数据进行分析,验证了该方法的有效性。
In the airborne synthetic aperture radar system, the estimation accuracy of Doppler parameters affects the image quality directly. This paper estimates Doppler centroid using the averaged azimuth spectrum, and it estimates the Doppler frequency rate by computing the shift between subimages. The raw data are windowed to reduce the affection of various noises in the system, and improve the estimation accuracy. Results of the algorithm can be used to compensate the phase error caused by motion error of the airborne. The method is finally verified with a set of actual experimental data.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2003年第3期41-44,共4页
Journal of National University of Defense Technology
基金
雷达信号处理国防科技重点实验室基金项目(51431020101KG01)
