摘要
围绕机载合成孔径雷达(SAR)的运动补偿问题,对机载SAR运动的相位误差作了分析。一方面详细分析了一种基于惯导数据的视线方向位移误差的补偿方法,采用了低精度低成本的INS,对这部分的原理及实现进行了深入的建模分析和推导,并给出仿真结果;另一方面采用了一种新的基于图像对比度的自聚焦算法,在自聚焦过程中为了提高寻优速度,通过不断取速度中值的方法使图像块对比度快速达到最大值,此时估计得到的多普勒参数使图像的整体聚焦效果最佳。最后结合距离多普勒(RD)成像算法,经过试验证实了改进的图像对比度算法是一种简单、高效的运动补偿算法。
This paper mainly discusses the motion compensation of airborne SAR and gives explanations of motion errors in airborne SAR. On one hand, the method for error compensation in the line of sight direction based on the data of low precision and low cost INS is analyzed. In-depth analysis and modeling of the principle and realization are performed, and the simulation results are given. On the other hand, a new autofocusing algorithm based on image contrast is analyzed. A method of lesser computation is used to get the maximal contrast of the image by finding the middle speed. At this time, the Doppler parameter and the image get the best result. Finally, in combination with the range Doppler algorithm, this algorithm is proved to be an effective motion compensation method.
出处
《雷达科学与技术》
2009年第4期257-261,共5页
Radar Science and Technology
基金
国家863高技术研究发展计划(No.2006AA12Z313)
关键词
合成孔径雷达
运动补偿
惯性导航
图像对比度
RD成像算法
synthetic aperture radar（SAR）
motion compensation
inertial navigation system（INS）
image contrast
range Doppler algorithm
