低干噪比下多特征融合的通信干扰识别方法

doi:10.12305/j.issn.1001-506X.2026.03.30

Abstract

Abstract:

To address the issue of low recognition accuracy for communication interference signals under low interference-to-noise ratio conditions, which is caused by weak signal features and the insufficient representation capability of single feature, a communication interference signal recognition method based on YOLOv8 and multi-feature fusion networks is proposed. First, a feature image extraction method based on projection transformation is introduced. Based on the varying sensitivities of different features to different signals, bispectrum transform, Hilbert-Huang transform, and short-time Fourier transform, which possess strong complementary characteristics, are selected as recognition features, and they are unified into feature maps suitable for two-dimensional convolutional neural networks via projection transformation. Secondly, leveraging the powerful feature learning capability of the YOLOv8 network, deep discriminative information is extracted in parallel from the aforementioned three heterogeneous feature maps. Then, a decision-level fully connected fusion network is designed to perform weighted integration of the probability vectors output by YOLOv8, thereby achieving the final classification decision. Experimental results demonstrate that this method significantly enhances the recognition performance under low interference-to-noise ratio conditions. Particularly, under the adverse condition of a ?20 dB low interference-to-noise ratio, the recognition accuracy reaches 48.18%, representing improvements of 40.60% and 31.86% over traditional methods and single-feature methods, respectively.

Key words: interference recognition, multi-feature fusion, deep learning, YOLOv8

CLC Number:

TN 92

Hongyu TIAN, Songhu GE, Yu GUO, Zhongpu CUI, Xiao LIANG. Communication interference recognition method based on multi-feature fusion under low interference-to-noise ratio conditions[J]. Systems Engineering and Electronics, 2026, 48(3): 1061-1071.

Figures/Tables 15

Table 1

Interference signal model"

干扰类型	数学模型	参数	参数含义
STJ	$x(t) = \sqrt {{A_j}} \exp [{\mathrm{j}}(2\text{π} {f_j}t + {\varphi _j})]$	${A_j}$	发射的干扰信号功率
		${f_j}$	干扰信号中心频率
		${\varphi _j}$	干扰信号初始相位，服从[0,2π）均匀分布
MTJ	$x(t) = \displaystyle\sum\limits_{i = 1}^M {\sqrt {{A_{{j_{\text{i}}}}}} \exp [{\mathrm{j}}(2\text{π} {f_{{j_i}}}t + {\varphi _{{j_i}}})]} $	$M$	单音干扰的数量
		${A_{{j_i}}}$	发射的干扰信号功率
		${f_{{j_i}}}$	干扰信号中心频率
		${\varphi _{{j_i}}}$	干扰信号初始相位，服从[0,2π）均匀分布且互相独立同分布
LFM	$ x(t) = \sqrt {{A_j}} \exp [{\mathrm{j}}(2\text{π} {f_j}t + \text{π} k{t^2} + {\varphi _j}] $	$k$	线性调频的斜率参数
NoiFM	$ x(t) = \sqrt {{A_j}} \exp [{\mathrm{j}}(2\text{π} {f_j}t + 2\text{π} {K_{{\mathrm{FM}}}}\displaystyle\int\nolimits_0^t {u(\tau ){\mathrm{d}}\tau } + {\varphi _j})] $	${K_{{\mathrm{FM}}}}$	调频比例常数
NoiFM		$u(\tau )$	带限高斯白噪声
NoiAM	$x(t) = [{U_0} + {U_n}(t)]\exp [{\mathrm{j}}(2\text{π} {f_j}t + {\varphi _j})]$	${U_0}$	发射的干扰信号功率
PBNJ	$x(t) = {U_n}(t)\exp [{\mathrm{j}}(2\text{π} {f_j}t + {\varphi _j})]$	$ {U_n}(t) $	带限高斯白噪声
BPSK	$x(t) = \sqrt {{A_j}} \exp [{\mathrm{j}}(2\text{π} {f_j}t + {\varphi _b} + {\varphi _j})]$	${\varphi _b}$	BPSK调制相位，取值为${\varphi _b} = 0,\pi $，分别表示比特0、1
QPSK	$x(t) = \sqrt {{A_j}} \exp [{\mathrm{j}}(2\text{π} {f_j}t + {\varphi _q} + {\varphi _j})]$	${\varphi _q}$	QPSK调制相位，取值为${\varphi _q} = 0,\dfrac{\text{π} }{2},\text{π} ,\dfrac{{3\text{π} }}{2}$，分别表示比特00、01、10、11
2ASK	$x(t) = \sqrt {{A_j}} m(t)\exp [{\mathrm{j}}(2\text{π} {f_j}t + {\varphi _j})]$	$m(t)$	$m(t) = 0,1$，分别表示比特0、1
2FSK	$x(t) = \sqrt {{A_j}} {m_j}(t)\exp [{\mathrm{j}}(2\text{π} {f_j}t + {\varphi _j})]$ ${m_j}(t) = \exp [{\mathrm{j}}(m(t) \cdot 2\text{π} {f_0}t + \overline {m(t)} \cdot 2\text{π} {f_1}t)]$	$\overline {m(t)} $	$m(t)$的相反数
2FSK		${m_j}(t)$	调制信号
MSK	$ x(t) = \sqrt {{A_j}} \exp \left[{\mathrm{j}}\left(2\text{π} {f_j}t + \dfrac{{\text{π} {a_k}}}{{2{T_s}}}t + {\varphi _k}\right)\right] $ $ k{T_s} \leqslant t \leqslant (k + 1){T_s},\;k = 0,1 \cdots $	${a_k}$	${a_k} = 1, - 1$，分别表示比特1、0

Table 1

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Table 2

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参数	参数值
采样频率/MHz	10
INR范围/dB	−20~10
INR步长/dB	2
信号采样点数	131 328

干扰类别	参数	参数值	干扰类别	参数	参数值
STJ	干扰频率/MHz	2	BPSK	码元速率/（kbit/s）	500
MTJ	干扰频率/MHz	1.5 2 3	QPSK	码元速率/（kbit/s）	500
LFM	调频系数/（MHz/s）	500	2ASK	码元速率/（kbit/s）	500
LFM	调频带宽/MHz	1	2ASK	码元速率/（kbit/s）	500
NoiFM	调频系数/（Hz/v）	500	2FSK	码元速率/（kbit/s）	500
NoiFM	调频带宽/MHz	1	2FSK	码元速率/（kbit/s）	500
NoiAM	调频带宽/MHz	1	MSK	码元速率/（kbit/s）	500
PBNJ	干扰带宽/MHz	1

方法	INR/dB
方法	10	0	−10	−20
BT+HHT+STFT	100	99.55	88.18	48.18
BT+HHT	94.55	87.73	53.64	22.27
BT+STFT	100	99.55	85.00	32.27
HHT+STFT	100	99.55	77.73	43.18
BT	84.55	84.09	38.64	10.45
HHT	80.45	29.55	15.45	6.36
STFT	100	98.64	69.09	16.82

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Communication interference recognition method based on multi-feature fusion under low interference-to-noise ratio conditions

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