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Symmetry 2017, 9(5), 75;

Neural Networks for Radar Waveform Recognition

College of Information and Telecommunication, Harbin Engineering University, Harbin 150001, China
Author to whom correspondence should be addressed.
Academic Editor: Angel Garrido
Received: 6 March 2017 / Revised: 11 May 2017 / Accepted: 12 May 2017 / Published: 17 May 2017
(This article belongs to the Special Issue Symmetry in Complex Networks II)
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For passive radar detection system, radar waveform recognition is an important research area. In this paper, we explore an automatic radar waveform recognition system to detect, track and locate the low probability of intercept (LPI) radars. The system can classify (but not identify) 12 kinds of signals, including binary phase shift keying (BPSK) (barker codes modulated), linear frequency modulation (LFM), Costas codes, Frank code, P1-P4 codesand T1-T4 codeswith a low signal-to-noise ratio (SNR). It is one of the most extensive classification systems in the open articles. A hybrid classifier is proposed, which includes two relatively independent subsidiary networks, convolutional neural network (CNN) and Elman neural network (ENN). We determine the parameters of the architecture to make networks more effectively. Specifically, we focus on how the networks are designed, what the best set of features for classification is and what the best classified strategy is. Especially, we propose several key features for the classifier based on Choi–Williams time-frequency distribution (CWD). Finally, the recognition system is simulated by experimental data. The experiments show the overall successful recognition ratio of 94.5% at an SNR of −2 dB. View Full-Text
Keywords: radar countermeasure; waveform recognition; T-F distribution; convolutional neural network radar countermeasure; waveform recognition; T-F distribution; convolutional neural network

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Zhang, M.; Diao, M.; Gao, L.; Liu, L. Neural Networks for Radar Waveform Recognition. Symmetry 2017, 9, 75.

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