单反射面紧缩场接收机灵敏度要求评估方法

根据洛伦兹互易定理,提出了一种对单反射面紧缩场接收机灵敏度要求进行评估的方法.分别计算紧缩场馈源发射的电磁波以及标准定标球散射的电磁波在位于反射面和静区中间的参考平面上的近场分布,并考虑反射面效率和馈源发射功率,即可得到在测量过程中,对接收机灵敏度的要求.该方法能够全面反应目标雷达散射截面、工作频率、馈源性能和位置、反射面形状尺寸及其边齿结构和边缘绕射、紧缩场静区中心位置等因素的影响.利用该方法对北京航空航天大学微波暗室紧缩场的接收机灵敏度要求进行评估,并与实验测试结果对比,进而验证该方法的正确性.

Evaluation method for the receiver sensitivity requirement of CATR with single reflector

Based on the Lorentz reciprocity theorem,a novel method was proposed for evaluating the receiver sensitivity requirement of compact antenna test range(CATR) with single reflector.Through calculating the near fields that excited by the feed of the CATR and scattered by the standard calibration sphere respectively,and considering the efficiency of the reflector and the transmit power of the feed,the receiver sensitivity requirement in the testing process could be obtained.This method could reflect the influences of radar cross section(RCS) of the target,working frequency,the property and position of the feed,the size,sawtooth structure and edge diffraction of the reflector,the center position of quiet zone.This method was used to evaluate the receiver sensitivity requirement of CATR in microwave anechoic chamber of Beijing University of Aeronautics and Astronautics,and the evaluation result was compared with the experiment result,then the validity of this method could be verified.