Semi-Supervised SAR ATR Framework with Transductive Auxiliary Segmentation
This work addresses the challenge of few-shot learning in SAR ATR, which is crucial for military and surveillance applications, but it appears incremental as it builds on existing CNN methods with semi-supervised techniques.
The paper tackles the problem of limited labeled training data in synthetic aperture radar (SAR) automatic target recognition (ATR) by proposing a semi-supervised framework with transductive auxiliary segmentation, achieving a recognition performance of 94.18% under 20 training samples per class and over 88.00% under 10 samples per class.
Convolutional neural networks (CNNs) have achieved high performance in synthetic aperture radar (SAR) automatic target recognition (ATR). However, the performance of CNNs depends heavily on a large amount of training data. The insufficiency of labeled training SAR images limits the recognition performance and even invalidates some ATR methods. Furthermore, under few labeled training data, many existing CNNs are even ineffective. To address these challenges, we propose a Semi-supervised SAR ATR Framework with transductive Auxiliary Segmentation (SFAS). The proposed framework focuses on exploiting the transductive generalization on available unlabeled samples with an auxiliary loss serving as a regularizer. Through auxiliary segmentation of unlabeled SAR samples and information residue loss (IRL) in training, the framework can employ the proposed training loop process and gradually exploit the information compilation of recognition and segmentation to construct a helpful inductive bias and achieve high performance. Experiments conducted on the MSTAR dataset have shown the effectiveness of our proposed SFAS for few-shot learning. The recognition performance of 94.18\% can be achieved under 20 training samples in each class with simultaneous accurate segmentation results. Facing variances of EOCs, the recognition ratios are higher than 88.00\% when 10 training samples each class.