雷达散射截面静态测量的精度分析

Precision Analysis on Statical Measurement of Radar Cross Section

本文讨论了在微波暗室内影响雷达散射截面(RCS)静态测量精度的因素。着重分析背景、喇叭馈源间耦合以及定标体引入误差的原因。指出目标支撑架和定标体是主要的误差源,其选用原则是:目标的雷达散射截面必须高于背景雷达散射截面20dB以上;视被测目标雷达散射截面量级选择相应的目标支撑和定标体。最后通过200mm×200mm的金属平板理论值和测量值的比较,说明上述分析的正确性。

Some factors which have great effects on the measurement precision of RCS in anechoic chambers, including the noise of background, the coulping between transmitting and receiving antennas and the choice of the standardized objects are discussed in this paper. The condusion that the main measurement errors come from the standardized objects and the support is also presented. Finally two principles are given in order to meet the needs of measurement pricision. (1)The RCS of the targets must be 20dB above that of the background; (2)The support and the standerdized objects should be selected according to the RCS level of the target.By means of these principles, a 200mm×200mm metal plat is used for comparting its theoretical and measured data. Very good results are obtained that verify the correctness of the principles.