微波着陆系统扫描波束主瓣替代的误差分析法

为了准确分析微波着陆系统(MLS)接收机多径测角误差,提出了一种基于波束主瓣替代的误差分析方法.利用该方法计算了接收扫描脉冲-3 dB门限前后沿误差,建立了场地环境条件下微波着陆系统测角误差模型.在经典模型限定的前提条件下进行了微波着陆系统接收机测角的多径误差计算,并与经典模型计算结果进行对比.结果表明,采用主瓣替代方法能较好地克服经典模型在分析多径误差方面的使用局限性,具有一定的理论和实用价值.

The Analysis Method of Error of MLS Based on Replacement Technology of Main-Lobe Beaming

In order to truly analyze the multi-path angle error of the microwave landing system(MLS) receiver,an error research method based on the equivalent replacement of the scanning beaming main lobe is presented.Through the equivalent Gauss replacement of the beam main-lobe of "From" and "To" pulse,the leading and trailing edge error of-3 dB scanning pulses threshold and the angle-measuring model of microwave landing system are derived.The method is used to calculate the angle-measuring performance error of the receiver for the special multi-path environment.The results of replacement method computation are compared with the computed results of classical model.The new method can overcome the limitation and deficiency of classical model in the exact error calculation.Moreover,the accuracy of results is more improved than the classical model.