L-DACS1系统干扰抑制与循环自适应波束形成方法

doi:10.3969/j.issn.1001-506X.2020.08.27

系统工程与电子技术 ›› 2020, Vol. 42 ›› Issue (8): 1850-1856.doi: 10.3969/j.issn.1001-506X.2020.08.27

L-DACS1系统干扰抑制与循环自适应波束形成方法

刘海涛(), 李广雪(), 孙海霞(), 王磊()

中国民航大学智能信号与图像处理天津市重点实验室, 天津 300300

收稿日期:2019-09-17 出版日期:2020-07-25 发布日期:2020-07-27
作者简介:刘海涛 (1966-),男,教授,硕士研究生导师，博士,主要研究方向为航空移动通信、宽带移动通信。E-mail:htliu@cauc.edu.cn|李广雪 (1994-),女,硕士研究生,主要研究方向为航空移动通信。E-mail:xjsg1997@163.com|孙海霞 (1996-),女,硕士研究生,主要研究方向为航空移动通信。E-mail:1071140029@qq.com|王磊 (1981-),女,副教授,硕士研究生导师，博士,主要研究方向为卫星导航信号处理、航空移动通信。E-mail:wanglei@cauc.edu.cn
基金资助:
国家自然科学基金民航联合基金(U1633108);国家自然科学基金民航联合基金(U1733120)

L-DACS1 system interference suppression and cyclic adaptive beamforming method

Haitao LIU(), Guangxue LI(), Haixia SUN(), Lei WANG()

Tianjin Key Laboratory for Advanced Signal Processing, Civil Aviation University of China, Tianjin 300300, China

Received:2019-09-17 Online:2020-07-25 Published:2020-07-27
Supported by:
国家自然科学基金民航联合基金(U1633108);国家自然科学基金民航联合基金(U1733120)

摘要/Abstract

摘要：

为了解决L频段数字航空通信系统1(L-band digital aeronautical communication system, L-DACS1)正交频分复用(orthogonal frequency division multiplex, OFDM)接收机遭受测距仪(distance measuring equipment, DME)信号干扰的问题,提出了正交投影干扰抑制与循环自适应波束形成的空域滤波方法。首先,利用正交投影算法抑制DME信号干扰;然后,利用OFDM信号的循环平稳特性,构建循环自相关矩阵,通过奇异值分解得到波束形成的最优权矢量;最后,利用最优权矢量进行空域滤波。仿真研究表明,该方法可以在OFDM期望信号上形成稳定的主波束,同时能够抑制DME信号干扰。且所提方法具有复杂度较低、低信噪比情况下波束形成算法鲁棒的优势。

关键词: L频段数字航空通信系统1, DME干扰, 正交投影, 循环平稳, 波束形成

Abstract:

In order to solve the problem that the orthogonal frequency division multiplex (OFDM) receiver of the L-band digital aeronautical communication system 1 (L-DACS1) suffers from signal interference of distance measuring equipment (DME), a spatial filtering method adapting orthogonal filtering interference suppression and cyclic adaptive beamforming is proposed. Firstly, the orthogonal projection algorithm is used to suppress the interference of the DME signal. Then, a cyclic autocorrelation matrix is constructed by using the cyclostationary characteristics of the OFDM signal. An optimal weight vector of beamforming is obtained by singular value decomposition. Finally, the spatial filtering is performed by using the optimal weight vector. The simulation results show that the proposed method can form a stable main beam on the OFDM desired signal, and at the same time, it can suppress the interference signal of the DME. The proposed method has the advantages of lower complexity and algorithm robustness under lower signal noise ratio.

Key words: L-band digital aeronautical communication system 1 (L-DACS1), distance measurement equipment (DME) interference, orthogonal projection, cyclostationary, beamforming

中图分类号:

TN973.3

刘海涛, 李广雪, 孙海霞, 王磊. L-DACS1系统干扰抑制与循环自适应波束形成方法[J]. 系统工程与电子技术, 2020, 42(8): 1850-1856.

Haitao LIU, Guangxue LI, Haixia SUN, Lei WANG. L-DACS1 system interference suppression and cyclic adaptive beamforming method[J]. Systems Engineering and Electronics, 2020, 42(8): 1850-1856.

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算法	复乘运算次数	复加运算次数
本文方法	4M+MN	MN+M
内积最大化^[16]	2M+MN	MN+M
输出SNR最大化^[17]	M+5MN	MN

系统参数	参数值
传输带宽/kHz	498.05
FFT运算点数	64
调制方式	正交相移键控
DME载波偏移/kHz	±500
阵列天线	8单元均匀线阵
阵元间隔	半波长
信道模型	加性高斯白噪声信道

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L-DACS1系统干扰抑制与循环自适应波束形成方法

L-DACS1 system interference suppression and cyclic adaptive beamforming method

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