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一种多径条件下的MLS接收机测角误差分析新方法
引用本文:戴传金,吴德伟,卢艳娥,赵修斌,何晶.一种多径条件下的MLS接收机测角误差分析新方法[J].航空学报,2010,31(5):983-988.
作者姓名:戴传金  吴德伟  卢艳娥  赵修斌  何晶
作者单位:空军工程大学电讯工程学院,陕西西安,710077
摘    要:为了准确分析多径环境条件下微波着陆系统接收机测角误差,在深入分析微波着陆系统(MLS)测角原理的基础上,提出了一种基于扫描波束主瓣等效替代的误差分析方法。该方法通过把往返波束脉冲主瓣用高斯钟形替代,准确计算了接收的扫描脉冲-3dB门限前后沿误差,建立了多路径条件下统一实用的接收脉冲包络波峰位置偏移误差模型和锁住闸门测量误差模型。为验证模型准确性,以特定的多径环境条件为例,计算MLS接收机的测角误差,将计算结果与利用Mathias经典模型的计算结果进行对比,并通过计算机仿真进行验证。结果表明,采用主瓣替代方法能够较好地克服经典模型精确分析误差方面的使用不足和缺陷,且对多径条件下接收机测角精度的准确评定具有一定的实用价值。

关 键 词:飞行器导航技术  多径传播  微波着陆系统  测角误差  仿真  建模  精度  

A New Method of Angle Error Analysis of Microwave Landing System (MLS) Receiver Under Multipath Condition
Dai Chuanjin,Wu Dewei,Lu Yan'e,Zhao Xiubin,He Jing.A New Method of Angle Error Analysis of Microwave Landing System (MLS) Receiver Under Multipath Condition[J].Acta Aeronautica et Astronautica Sinica,2010,31(5):983-988.
Authors:Dai Chuanjin  Wu Dewei  Lu Yan'e  Zhao Xiubin  He Jing
Institution:Telecommunication Engineering Institute, Air Force Engineering University
Abstract:In order to accurately analyze the angle error of the microwave landing system (MLS) receiver in the multipath environment, an error research method based on the equivalent replacement of the scanning beaming main lobe is presented. By using the Gaussian bell-shaped replacement of the “to and fro” scanning beaming main lobe, an accurate calculation of the leading and trailing error of -3 dB threshold of the received scanning pulse is completed. The peak location error model and Dwell Gate processor measurement error model for received pulse envelope are established. To verify the model accuracy, the proposed method is applied to calculating the angle error of the receiver in the specific multipath environment. What is more, the results are compared with the calculation results using classical Mathias model. Comparison of them shows that the new method can overcome the limitation and deficiency of the classical model in the exact error calculation. Moreover, it is of some practical value in correct assessment of the angle measurement accuracy.
Keywords:navigation technology of aircraft  multipath propagation  microwave landing system  angle error  simulation  modeling  accuracy
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