条带式SAR常用成像算法的误差及计算效率分析  

Error and Computational Efficiency Analysis of Common Imaging Algorithms in Strip-map SAR

作　　者：刘希红[1] 周鹏[1] 张晰[2] 戴永寿[1] 

机构地区：[1]中国石油大学(华东),山东青岛266580 [2]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《遥感信息》2016年第6期1-6,共6页Remote Sensing Information

基　　金：国家自然科学基金(61501520);海洋公益性行业科研专项项目(201505002)

摘　　要：针对条带式SAR系统设计中,二次相位误差的大小和计算效率是进行算法选择的重要依据,而一般文献只做定性分析的问题,该文对距离多普勒(近似)、距离多普勒(精确)、Chirp Scaling、ωKA(近似)和ωKA(精确)5种常用算法,推导了二次相位误差和计算量的公式,对条带式常用成像算法的二次相位误差及计算量进行了详细的定量分析。编写了一个带图形操作界面的计算程序,可供用户计算条带式模式下5种常用算法的二次相位误差及计算量。通过用户界面,可以方便地得到5种成像算法的相位误差及计算量,以及计算量和相位误差随入射角的变化,从而为用户成像算法的选择提供一定依据。It is essential to select a proper imaging algorithm in the design process of strip-map synthetic aperture radar （SAR） systems. The choice of a proper imaging algorithm largely depends on the magnitude of the phase error and the computational efficiency. In this paper,phase errors and calculation amount of each commonly used imaging algorithm in strip- map SAR are quantitatively analyzed in detail. The formulae of quadratic phase error and calculation amount are derived for range Doppler （approximate） algorithm, range Doppler （accurate） algorithm, Chirp Scaling algorithm, ωKA （approximate） algorithm and ωKA （accurate） algorithm. A computer program with a graphical user interface is designed for users to calculate the phase error and calculation amount in Strip-map SAR. Through the user interface, phase errors and calculation amount of five imaging algorithms are easily attained. The variation of the calculation amount and phase errors along with the change of the incidence angle is also presented in our software. Therefore,the derived formulae and our software can provide a basis for users to choose a proper imaging algorithm.

关 键 词：距离多普勒算法 CHIRP SCALING算法 ωKA算法 误差分析 计算效率分析 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]