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。
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.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2010年第5期983-988,共6页
Acta Aeronautica et Astronautica Sinica
基金
陕西省自然科学基金(SJ081-06)
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
navigation technology of aircraft
multipath propagation
microwave landing system
angle error
simulation
modeling
accuracy
