一种基于EfficientNet与BiGRU的多角度SAR图像目标识别方法

合成孔径雷达(SAR)的自动目标识别(ATR)技术目前已广泛应用于军事和民用领域。SAR图像对成像的方位角极其敏感，同一目标在不同方位角下的SAR图像存在一定差异，而多方位角的SAR图像序列蕴含着更加丰富的分类识别信息。因此，该文提出一种基于EfficientNet和BiGRU的多角度SAR目标识别模型，并使用孤岛损失来训练模型。该方法在MSTAR数据集10类目标识别任务中可以达到100%的识别准确率，对大俯仰角(擦地角)下成像、存在版本变体、存在配置变体的3种特殊情况下的SAR目标分别达到了99.68%, 99.95%, 99.91%的识别准确率。此外，该方法在小规模的数据集上也能达到令人满意的识别准确率。实验结果表明，该方法在MSTAR的大部分数据集上识别准确率均优于其他多角度SAR目标识别方法，且具有一定的鲁棒性。 

Target Recognition Method for Multi-aspect Synthetic Aperture Radar Images Based on EfficientNet and BiGRU

Automatic Target Recognition (ATR) in Synthetic Aperture Radar (SAR) has been extensively applied in military and civilian fields. However, SAR images are very sensitive to the azimuth of the images, as the same target can differ greatly from different aspects. This means that more reliable and robust multiaspect ATR recognition is required. In this paper, we propose a multiaspect ATR model based on EfficientNet and BiGRU. To train this model, we use island loss, which is more suitable for SAR ATR. Experimental results have revealed that our proposed method can achieve 100% accuracy for 10-class recognition on the Moving and Stationary Target Acquisition and Recognition (MSTAR) database. The SAR targets in three special imaging cases with large depression angles, version variants, and configuration variants reached recognition accuracies of 99.68%, 99.95%, and 99.91%, respectively. In addition, the proposed method achieves satisfactory accuracy even with smaller datasets. Our experimental results show that our proposed method outperforms other state-of-the-art ATR methods on most MSTAR datasets and exhibits a certain degree of robustness.