干涉式微波辐射计成像算法以及天线阵采样方案分析  

Imaging Algorithm and Antenna Array of Interferometric Microwave Radiometer

作　　者：张成[1] 吴季[1] 孙伟英[1] 

机构地区：[1]中国科学院空间科学与应用研究中心

出　　处：《遥感技术与应用》2007年第2期135-140,共6页Remote Sensing Technology and Application

基　　金：国家自然科学基金资助项目(No.40574070;40671121)

摘　　要：对旋转扫描干涉式微波辐射计成像算法进行研究,提出了基于伪极网格傅立叶变换的成像算法,利用一维插值以及一维FFT即可实现图像重建,既提高了成像精度,又保证了成像速度。以3种8单元天线排列方案阵为例,利用本文方法和基于线性插值的笛卡儿网格方法分别进行成像模拟,模拟结果验证了本文方法的优越性,同时表明天线阵排列方案对成像结果影响很大,天线阵基线均匀性越好,数量越多,成像质量就越好。直线阵无法实现基线数量与均匀性的统一,而平面阵可以在较好均匀性情况下实现最多的基线数,是天线阵排列的首选方案。The imaging theory of rotary scanning synthetic aperture microwave radiometer is studied, and a new imaging algorithm based on pseudo-polar FFT is developed. The critical feature of the algorithm is that it involves only 1-D equispaced FFT and 1-D interpolation, so it is more fast and accurate for application. In order to validate this new algorithm and analyze the antenna array effects on image reconstruction, the imaging of three typical designs of 8 elements antenna array is simulated by the pseudo-polar FFT method and linear interpolation based Cartesian FFT method. The results illustrate the superior performance of the new method and also indicate that the baseline＇s uniformity and number have a great influence on the reconstruction, and the plane distributed antenna array is preferred rather than the linear distributed array for it has more baselines and good uniformity simultaneously.

关 键 词：干涉式微波辐射计 被动微波成像 伪极网格FFT 天线阵列 

分 类 号：TP722.6[自动化与计算机技术—检测技术与自动化装置]