窄带干扰及动态环境BOC调制信号多通道并行捕获

doi:10.12305/j.issn.1001-506X.2023.04.32

摘要/Abstract

摘要：

针对窄带干扰及动态环境二进制偏移载波(binary offset carrier, BOC)调制信号捕获困难、捕获效率低的问题, 提出利用奇异值分解(singular value decomposition, SVD)结合最小描述长度(minimum description length, MDL)准则对窄带干扰进行抑制。在部分匹配滤波器结合分数阶傅里叶变换(partially matched filter-fractional Fourier transform, PMF-FRFT)捕获算法的基础上提出结合伪码复合以及异步伪码相关累加的多通道并行捕获算法。该算法首先对接收到的含窄带干扰信号做SVD, 利用MDL准则自适应估计出干扰信号的个数并完成干扰抑制; 然后, 将信号伪码相加形成新的伪码序列, 由PMF-FRFT结合异步伪码相关累加算法实现对多个信号的精确捕获。仿真结果表明, SVD窄带干扰抑制算法在较好保留原信号特征的基础上能够有效抑制干扰信号, 且性能稳定。提出的伪码复合结合异步伪码相关累加多通道捕获的算法可同时完成多个信号的捕获, 有效提升信号捕获概率、减少捕获时间。

关键词: 窄带干扰, 奇异值分解, 最小描述长度准则, 伪码复合, 异步伪码相关累加, 多通道

Abstract:

Aiming at the problems of difficult acquisition and low acquisition efficiency of narrowband interference and binary offset carrier (BOC) modulated signals in dynamic environments, singular value decomposition (SVD) combined with minimum description length (MDL) craterion to suppress narrowband interference is proposed. Based on the partially matched filter-fractional Fourier transform (PMF-FRFT) acquisition algorithm, a multi-channel parallel acquisition algorithm combining pseudo-code composite and asynchronous pseudo-code correlation accumulation is proposed. The proposed algorithm firstly performs SVD on the received narrowband interference signals, and uses the MDL criterion to adaptively estimate the number of interference signals and complete the interference suppression. Secondly, the signal pseudo-codes are added to form a new pseudo-code sequence, and multiple signals are accurately captured by PMF-FRFT combined with the asynchronous pseudo-code correlation accumulation algorithm. The simulation results show that the SVD narrowband interference suppression algorithm can effectively suppress the interference signal on the basis of better preserving the original signal characteristics, and the performance is stable. The proposed pseudo-code composite combined with the asynchronous pseudo-code correlation-accumulation multi-channel acquisition algorithm can complete the acquisition of multiple signals at the same time, with the effectively improvement of the signal acquisition probability and reduction of the acquisition time.

Key words: narrowband interference, singular value decomposition (SVD), minimum description length (MDL) criterion, pseudo code composite, asynchronous pseudocode correlation accumulation, multi-channel

中图分类号:

TN967.1

张天骐, 方竹, 汪锐, 王雪怡. 窄带干扰及动态环境BOC调制信号多通道并行捕获[J]. 系统工程与电子技术, 2023, 45(4): 1222-1230.

Tianqi ZHANG, Zhu FANG, Rui WANG, Xueyi WANG. Multi-channel parallel acquisition of BOC modulation signals in narrowband interference and dynamic environment[J]. Systems Engineering and Electronics, 2023, 45(4): 1222-1230.

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