基于稀疏贝叶斯推断的LDACS波束形成方法

doi:10.12305/j.issn.1001-506X.2025.01.34

摘要/Abstract

摘要：

L波段数字航空通信系统(L-band digital aeronautical communication system, LDACS)作为未来航空数据链的重要技术手段之一, 非常容易受到相邻波道的测距机系统信号的干扰。为此, 提出一种基于稀疏贝叶斯推断的LDACS波束形成方法。首先, 将LDACS地面站的粗略来向信息作为先验, 并根据空域信号来向的稀疏性构建稀疏信号。随后, 通过贝叶斯推断估算干扰和噪声的功率, 估计各个信源的来向。最后, 重构干扰噪声协方差矩阵, 获得波束形成权矢量。该方法无需知晓干扰数量、干扰来向等信息。仿真结果表明, 该方法在低信噪比和少快拍条件下也能稳定输出波束方向图, 表现出较好性能。

关键词: L波段数字航空通信系统, 测距机, 波束形成, 稀疏贝叶斯推断

Abstract:

The L-band digital aeronautical communication system (LDACS), as one of the important technical means of the future aviation data link, is easy to be interfered by distance measuring equipment system signals of adjacent channels. Therefore, a beamforming method for LDACS based on sparse Bayesian inference is proposed. Firstly, the rough direction information of LDACS ground station is taken as a priori, and sparse signal is constructed according to the incoming sparsity of spatial signal. Then, Bayesian inference is used to estimate the power of interference and noise, and to estimate the coming of each signal source. Finally, the interference noise covariance matrix is reconstructed to obtain the beamforming weight vector. The method does not need to know the amount of interference and the direction of interference. Simulation results validate that the proposed method can also stabilize the output beam pattern and show good performance under the condition of low signal to noise ratio and few snapshots.

Key words: L-band digital aeronautical communication system (LDACS), distance measuring equipment, beamforming, sparse Bayesian inference

中图分类号:

TN911
V243.1

王磊, 高翔, 胡潇潇. 基于稀疏贝叶斯推断的LDACS波束形成方法[J]. 系统工程与电子技术, 2025, 47(1): 332-339.

Lei WANG, Xiang GAO, Xiaoxiao HU. Beamforming method based on sparse Bayesian inference in LDACS[J]. Systems Engineering and Electronics, 2025, 47(1): 332-339.

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参数	取值
传输带宽/kHz	498.05
子载波间距/kHz	9.765
采样频率/MHz	2.5
OFDM符号周期/μs	120
有效子载波个数	50
DME干扰个数	2
DME载波偏置/kHz	500
阵列类型	均匀线阵
阵元个数	10
阵元间隔	半波长
信道类型	加性高斯白噪声信道

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