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Article

Radar HRRP Target Recognition Based on Dynamic Learning with Limited Training Data

National Lab. of Radar Signal Processing, Xidian University, Xi’an 710071, China
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Author to whom correspondence should be addressed.
Academic Editor: Ali Khenchaf
Received: 20 January 2021 / Revised: 8 February 2021 / Accepted: 15 February 2021 / Published: 18 February 2021
For high-resolution range profile (HRRP)-based radar automatic target recognition (RATR), adequate training data are required to characterize a target signature effectively and get good recognition performance. However, collecting enough training data involving HRRP samples from each target orientation is hard. To tackle the HRRP-based RATR task with limited training data, a novel dynamic learning strategy is proposed based on the single-hidden layer feedforward network (SLFN) with an assistant classifier. In the offline training phase, the training data are used for pretraining the SLFN using a reduced kernel extreme learning machine (RKELM). In the online classification phase, the collected test data are first labeled by fusing the recognition results of the current SLFN and assistant classifier. Then the test samples with reliable pseudolabels are used as additional training data to update the parameters of SLFN with the online sequential RKELM (OS-RKELM). Moreover, to improve the accuracy of label estimation for test data, a novel semi-supervised learning method named constraint propagation-based label propagation (CPLP) was developed as an assistant classifier. The proposed method dynamically accumulates knowledge from training and test data through online learning, thereby reinforcing performance of the RATR system with limited training data. Experiments conducted on the simulated HRRP data from 10 civilian vehicles and real HRRP data from three military vehicles demonstrated the effectiveness of the proposed method when the training data are limited. View Full-Text
Keywords: constraint propagation-based label propagation (CPLP); dynamic learning; high-resolution range profile (HRRP); online sequential reduced kernel extreme learning machine (OS-RKELM); radar automatic target recognition (RATR); single-hidden layer feedforward network (SLFN) constraint propagation-based label propagation (CPLP); dynamic learning; high-resolution range profile (HRRP); online sequential reduced kernel extreme learning machine (OS-RKELM); radar automatic target recognition (RATR); single-hidden layer feedforward network (SLFN)
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MDPI and ACS Style

Wang, J.; Liu, Z.; Xie, R.; Ran, L. Radar HRRP Target Recognition Based on Dynamic Learning with Limited Training Data. Remote Sens. 2021, 13, 750. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13040750

AMA Style

Wang J, Liu Z, Xie R, Ran L. Radar HRRP Target Recognition Based on Dynamic Learning with Limited Training Data. Remote Sensing. 2021; 13(4):750. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13040750

Chicago/Turabian Style

Wang, Jingjing, Zheng Liu, Rong Xie, and Lei Ran. 2021. "Radar HRRP Target Recognition Based on Dynamic Learning with Limited Training Data" Remote Sensing 13, no. 4: 750. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13040750

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