基于修正快速傅里叶变换算法的仪表着陆系统信号干扰抑制与定量分析

doi:10.11772/j.issn.1001-9081.2014.10.3039

计算机应用 ›› 2014, Vol. 34 ›› Issue (10): 3039-3043.DOI: 10.11772/j.issn.1001-9081.2014.10.3039

基于修正快速傅里叶变换算法的仪表着陆系统信号干扰抑制与定量分析

孙丹¹,白杰¹,史志波²

1. 天津市民用航空器适航与维修重点实验室(中国民航大学)，天津 300300；
2. 中国民航大学航空自动化学院，天津 300300；

收稿日期:2014-03-24 修回日期:2014-04-30 出版日期:2014-10-01 发布日期:2014-10-30
通讯作者: 孙丹
作者简介:孙丹(1979-),女,黑龙江鹤岗人,助理研究员,硕士，主要研究方向:航空电子系统维修、适航审定;
白杰(1963-),男,辽宁铁岭人,教授,硕士，主要研究方向:民用航空器维修、适航审定;
史志波(1980-),男,江苏徐州人,讲师,博士研究生，主要研究方向:飞行控制系统、飞行管理系统、适航性评估。
基金资助:
国家973计划项目

Interference suppression and quantitative analysis of instrument landing system signal based on modified fast Fourier transformation algorithm

SUN Dan¹,BAI Jie¹,SHI Zhibo²

1. Tianjin Key Laboratory for Airworthiness and Maintenance of Civil Aircraft (Civil Aviation University of China), Tianjin 300300, China;
2. Aeronautical Automation College, Civil Aviation University of China, Tianjin 300300, China;

Received:2014-03-24 Revised:2014-04-30 Online:2014-10-01 Published:2014-10-30
Contact: SUN Dan

摘要/Abstract

摘要：

针对日益繁忙的机场空域和周边建筑对仪表着陆系统信号干扰的增加，以及传统模拟处理技术缺陷，提出一种基于修正快速傅里叶变换(FFT)频谱校正和最小均方差(LMS)算法自适应滤波器结合实现仪表着陆系统(ILS)信号鉴频分离的技术方案。该方案应用LMS自适应滤波器对ILS信号干扰进行抑制，完成滤波器的权值系数设定，并通过修正FFT技术在时域与频域内对ILS信号进行频谱分离与提取，修正其频谱幅值，以消除由于采样引起的频谱泄露和栅栏效应对信号的影响，使得提取信号逼近理想情况，提高调制度差(DDM)识别精度。针对ILS信号的干扰抑制与频域分离进行了仿真验证，结果表明所提出的信号处理系统技术方案能够有效地对干扰进行抑制,完成信号频域识别，为飞机着陆进近阶段提供准确可靠的导航信息。

Abstract:

For the problem of the increasing busy airport airspace and the surrounding buildings attaching disturbance to the Instrument Landing System (ILS) signal, and the defects of traditional analogue signal processing technology, a new method was given to realize the ILS signal frequency separation based on the modified Fast Fourier Transformation (FFT) spectrum correction and Least Mean Square (LMS) adaptive filter. The LMS adaptive filter was used to suppress ILS signal interference, with setting optimal weight filter coefficient. And the ILS signal spectrum was separated and extracted based on the modified FFT technique in time domain and frequency domain. The spectrum amplitude was corrected in order to eliminate the impact of the spectral leakage and picket fence effect caused by signal sample for improving the recognition accuracy of Difference in the Depth of Modulation (DDM). The simulation was carried out to verify the effect of interference suppression and frequency separation to the ILS signal. The results reveal that the proposed technical scheme of signal processing system can effectively suppress the interference and complete frequency domain identification, which can provide reliable and accurate navigation information in the aircraft landing approach.

中图分类号:

TP273.2

孙丹白杰史志波. 基于修正快速傅里叶变换算法的仪表着陆系统信号干扰抑制与定量分析[J]. 计算机应用, 2014, 34(10): 3039-3043.

SUN Dan BAI Jie SHI Zhibo. Interference suppression and quantitative analysis of instrument landing system signal based on modified fast Fourier transformation algorithm[J]. Journal of Computer Applications, 2014, 34(10): 3039-3043.

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基于修正快速傅里叶变换算法的仪表着陆系统信号干扰抑制与定量分析

Interference suppression and quantitative analysis of instrument landing system signal based on modified fast Fourier transformation algorithm

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