季节和地形对图像匹配制导的影响分析  

Analysis on Influence of Seasonal Changes and Terrain Undulation on Image Matching Guidance

作　　者：李高升[1] 刘继斌[1] 刘培国[1] 何建国[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《无线电工程》2010年第12期27-30,共4页Radio Engineering

基　　金：预研基金(9140A04020310KG0112;9140A31020609KG0170)

摘　　要：研究了影响精确制导中的图像匹配末制导性能的季节和地形2种因素。季节的更替导致地表植被状况特别是含水量呈现规律性变化,引起电磁特性的变化。其中,复介电常数相对于单位体积的液态水含量呈线性变化,发射信号频率越高,衰减作用越大,有效穿透越低;地表状况和雷达系统内部因素将影响测高精度,对匹配带来间接影响;地形起伏也会带来电磁散射特性变化,其对成像的影响可归结为像点的平移,成像点的偏移量与成像区域的相对高度有关。Season and terrain,two elements that influence the performance of image matching end guidance,are studied in the paper.Seasonal changes result in the regular transformation of surface vegetation,especially the ratio of water,which could change the electromagnetic characteristics of ground.Complex permittivity changes regularly according to the liquid water storage per unit,and the signal attenuation increases when the transmission frequency increases.Status of the earth's surface as well as internal elements of radar will influence the precision of height measurement,which can influence the matching indirectly.Undulating terrain can also cause the changes of electromagnetic characteristics,which influences the imaging in terms of the translation of image points,and there is a close relationship between the position offset and the altitude of the image area.

关 键 词：季节 地形起伏 图像匹配 匹配制导 影响分析 Image Matching TERRAIN SEASONAL Changes Influence 线性变化 发射信号频率 成像 液态水含量 复介电常数 制导性能 植被状况 像点 相对高度 特性变化 衰减作用 

分 类 号：TN014[电子电信—物理电子学]