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Sensors 2016, 16(10), 1682; doi:10.3390/s16101682

LPI Radar Waveform Recognition Based on Time-Frequency Distribution

College of Information and Telecommunication, Harbin Engineering University, Harbin 150001, China
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Author to whom correspondence should be addressed.
Academic Editor: Changzhi Li
Received: 5 July 2016 / Revised: 6 October 2016 / Accepted: 7 October 2016 / Published: 12 October 2016
(This article belongs to the Special Issue Non-Contact Sensing)
View Full-Text   |   Download PDF [1180 KB, uploaded 12 October 2016]   |  

Abstract

In this paper, an automatic radar waveform recognition system in a high noise environment is proposed. Signal waveform recognition techniques are widely applied in the field of cognitive radio, spectrum management and radar applications, etc. We devise a system to classify the modulating signals widely used in low probability of intercept (LPI) radar detection systems. The radar signals are divided into eight types of classifications, including linear frequency modulation (LFM), BPSK (Barker code modulation), Costas codes and polyphase codes (comprising Frank, P1, P2, P3 and P4). The classifier is Elman neural network (ENN), and it is a supervised classification based on features extracted from the system. Through the techniques of image filtering, image opening operation, skeleton extraction, principal component analysis (PCA), image binarization algorithm and Pseudo–Zernike moments, etc., the features are extracted from the Choi–Williams time-frequency distribution (CWD) image of the received data. In order to reduce the redundant features and simplify calculation, the features selection algorithm based on mutual information between classes and features vectors are applied. The superiority of the proposed classification system is demonstrated by the simulations and analysis. Simulation results show that the overall ratio of successful recognition (RSR) is 94.7% at signal-to-noise ratio (SNR) of −2 dB. View Full-Text
Keywords: LPI radar; time-frequency distribution; digital image processing; waveform recognition LPI radar; time-frequency distribution; digital image processing; waveform recognition
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, M.; Liu, L.; Diao, M. LPI Radar Waveform Recognition Based on Time-Frequency Distribution. Sensors 2016, 16, 1682.

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