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

Abstract

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

CLC Number:

TN973.3

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.

Figures/Tables 10

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References 23

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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 system interference suppression and cyclic adaptive beamforming method

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