SAR成像处理中插值算法的比较研究

在SAR的回波数据的成像处理中,距离徙动是影响二维压缩成像聚焦效果的重要因素。因此距离徙动的校正是SAR成像过程中的关键。本文以机载正侧视点目标成像为例,对SAR回波中的距离徙动进行了分析,研究了3种插值方法:最近邻域近似法、拉格朗日插值法、sinc插值法在SAR成像中的应用。通过计算机仿真,分析了3种插值方法校正弯曲的效果,并对3种插值方法的运算量和成像结果进行了比较。结果表明要根据插值的精度和运算量的大小选择合适的插值方法。

Comparison of interpolation algorithms in synthetic aperture radar imaging processing

In the processing of the synthetic aperture radar (SAR) image formation, range cell compensation plays a most important role in focusing an image and its correction is the most critical procedure in SAR image formation.Taking point target imaging of airborne side-looking SAR as an example, the range cell migration in the SAR echo signals is analyzed and three types of interpolation algorithms:nearest neighbor approximation,Lagrange interpolation, and sinc function interpolation are studied in this essay. Simulations results are given to illustrate the effectiveness of the three methods in correcting the curving, and in the end the computing load and the imaging result are compared. According to the required precision and computing load you can select the proper method in the application.