近场条件下散射计的绝对定标  

Absolute Calibration of Scatterometers in Near Field Region

作　　者：董晓龙[1] 吴季[1] 孙波[1] 姜景山[1] 

机构地区：[1]中国科学院空间科学与应用研究中心8701信箱,北京100080

出　　处：《电子学报》1999年第6期5-8,共4页Acta Electronica Sinica

摘　　要：在推导散射计定标公式的基础上，本文分析了远区条件对于雷达散射计绝对定标的意义，通过引入有效雷达散射截面的概念，将入射波前球面弯曲和波束限制引起照射不均匀以及接收天线增益的变化等效为目标雷达散射截面的变化．通过修正使近、远场的定标公式得以统一，给出相应的定标方法．实际的定标结果证明了方法的有效性．文中还给出了关于定标体选择和瞄准精度要求的初步讨论．In this paper,procedure of the absolute calibration of radar scatterometer is presented. Effects of the far field criterion for the calibration are analyzed. After converting the effect of curvature of spherical wavefront and the amplitude and phase nonuniformity of the incident field to the variation of the radar cross section, the concept of effective radar cross section (ERCS) is introduced to unify the calibration formula for near field region and far field region measurement, Using the new formula,a practical near field region absolute calibration scheme is proposed. Absolute calibrations of four scatterometers of S,C,X and Ku band show the validity of the given method.

关 键 词：散射计 绝对定标 远红条件 近区 雷达设备 

分 类 号：TP73[自动化与计算机技术—检测技术与自动化装置] TN957[自动化与计算机技术—控制科学与工程]