测距仪干扰信号频域特性研究

中国民航大学学报 ›› 2021, Vol. 39 ›› Issue (2): 16-20.

测距仪干扰信号频域特性研究

李冬霞，陈佩，刘海涛，王磊

（中国民航大学天津市智能信号与图像处理重点实验室，天津 300300）

收稿日期:2020-05-20 修回日期:2020-05-20 接受日期:2020-04-21 出版日期:2021-04-10 发布日期:2021-11-27
作者简介:李冬霞（1971—），女，陕西绥德人，副教授，博士，研究方向为航空移动通信系统。
基金资助:
国家自然科学基金项目（U1733120）；天津市自然科学基金青年基金项目（19JCQNJC00800）

Frequency-domain characteristics of DME interference signal

LI Dongxia, CHEN Pei, LIU Haitao, WANG Lei

Intelligent Signal and Image Processing Key Lab of Tianjin, CAUC, Tianjin 300300, China

Received:2020-05-20 Revised:2020-05-20 Accepted:2020-04-21 Online:2021-04-10 Published:2021-11-27

摘要/Abstract

摘要：

测距仪（DME, distance measuring equipment）信号是 L 波段数字航空通信系统 1（L-DACS1, L-band digital aeronautical communication system 1）的主要干扰源。为寻求有效的 DME 干扰抑制算法，对 DME 信号的频域干扰特性研究十分必要。首先建立归一化的 DME 信号模型，通过理论推导出基带 DME 信号，载波偏置 DME 信号的频谱和功率谱闭合数学表达式；再利用理想低通滤波器的传输特性，给出经低通滤波后的载波偏置 DME 信号频谱和功率谱数学表达式；最后计算滤波后 DME 信号的平均功率。仿真结果表明：经过低通滤波的载波偏置 DME 信号功率衰减约 33 dB，验证了理论推导的正确性。

关键词: 测距仪信号, L 波段数字航空通信系统 1, 低通滤波, 频域特性

Abstract: DME signal is the main interference source of L -DACS1. It is necessary to research the frequency -domain characteristics of DME signals in order to find the effective DME interference suppression algorithm. Firstly, a normalized DME signal model is established, and the closed -form mathematical expressions of spectrum and power spectrum of baseband DME signal and carrier offset DME signal are derived. Then, basing on the transmission characteristics of the ideal low-pass filter, the spectrum and power spectrum of the carrier offset DME signal after low-pass filter are given. Finally, the average power of DME signal after filtering is calculated. Simulation result shows that the power attenuation of carrier offset DME signal after low-pass filtering is about 33 dB, verifying the correctness of the theoretical derivation.

Key words: distance measuring equipment signal, L-DACS 1, low-pass filtering wave, characteristics in frequency domain

中图分类号:

李冬霞, 陈佩, 刘海涛, 王磊. 测距仪干扰信号频域特性研究[J]. 中国民航大学学报, 2021, 39(2): 16-20.

LI Dongxia, CHEN Pei, LIU Haitao, WANG Lei. Frequency-domain characteristics of DME interference signal [J]. Journal of Civil Aviation University of China, 2021, 39(2): 16-20.

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