基于互易点学习的LPI信号开集识别

doi:10.12305/j.issn.1001-506X.2022.09.07

摘要/Abstract

摘要：

针对现有采用时频图结合深度学习模型对低截获概率(low probability of intercept, LPI)雷达信号识别的方法在开集场景下会失效的问题, 提出一种基于互易点学习(reciprocal point learning, RPL)和阈值判断的雷达信号开集识别方法。通过RPL对特征空间进行优化, 使已知类和未知类信号样本在特征空间中分布不同, 最后确定合适的阈值进行开集识别。根据时频图的特点, 在特征提取网络中加入注意力机制使网络更关注图像能量聚集的有效部分。实验结果表明, 该方法在开放的电磁环境条件下具有良好的适应性。

关键词: 低截获概率信号, 开集识别, 深度学习, 互易点学习, 注意力机制

Abstract:

The existing method of low probability of intercept (LPI) radar signal recognition using time-frequency image combined with deep learning model will fail in the open-set scenario. A method of radar signal open-set recognition based on reciprocal point learning (RPL) and threshold judgment is proposed to solve this problem. The embedding space is optimized by RPL, so the signals of known classes and unknown classes are distributed differently in it. Finally, an appropriate threshold is determined for open-set recognition. According to the characteristics of time-frequency image, the attention mechanism module is added in feature extraction network to make it pay more attention to the effective part of energy-intensive. Experimental results show that the proposed method has good adaptability in open electromagnetic environment.

Key words: low probability of intercept (LPI) signal, open-set recognition, deep learning, reciprocal point learning (RPL), attention mechanism

中图分类号:

TN971.1

韩啸, 陈世文, 陈蒙, 杨锦程. 基于互易点学习的LPI信号开集识别[J]. 系统工程与电子技术, 2022, 44(9): 2752-2759.

Xiao HAN, Shiwen CHEN, Meng CHEN, Jincheng YANG. Open-set recognition of LPI radar signal based on reciprocal point learning[J]. Systems Engineering and Electronics, 2022, 44(9): 2752-2759.

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调制类型	主要参数	值
LFM	调制带宽	U(f_s/20, f_s/16)
BPSK	巴克码位数	{7, 11, 13}
Costas	频率序列	{[3, 2, 6, 4, 5, 1], [5, 4, 6, 2, 3, 1], [2, 4, 8, 5, 10, 9, 7, 3, 6, 1]}
Frank, P1	步进频率	{6, 7, 8}
P2	步进频率	{6, 8}
P3, P4	步进频率	{6, 7, 8}
T1, T2	序列段数	{4, 5, 6}
T3, T4	调制带宽	U(f_s/20, f_s/10)
T3, T4	序列段数	{4, 5, 6}

调制类型	主要参数	值
LFM/BPSK	带宽	U(f_s/20, f_s/10)
LFM/BPSK	巴克码位数	{7, 13}
LFM/FSK	带宽	U(f_s/40, f_s/30)
	跳频数	{3, 4}
	跳频频率	U(f_s/60, f_s/40)
BPSK/FSK	巴克码位数	{5, 7}
	跳频数	{3, 4, 5}
	跳频频率	U(f_s/6, f_s/48)
NLFM	带宽	U(0.14f_s, 0.3f_s)

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