基于卷积神经网络的海上微动目标检测与分类方法

Detection and Classification of Maritime Target with Micro-motion Based on CNNs

该文利用深度学习的高维特征泛化学习能力,将卷积神经网络(CNN)用于海上目标微多普勒的检测和分类。首先,在海面微动目标模型的基础上,在实测海杂波背景中分别构建4种类型微动信号的2维时频图,并作为训练和测试数据集;然后,分别采用LeNet, AlexNet和GoogLeNet 3种CNN模型进行二元检测和多种微动类型分类,并进行比较,研究信杂比对检测和分类性能的影响。最后,与传统的支持向量机方法进行比较,结果表明,所提方法能够智能学习微动特征,具有更好的检测和分类性能,可为杂波背景下的雷达动目标检测和识别提供新的技术途径。

In this paper, Convolutional Neural Networks （CNN） are used to detect and classify micro-Doppler effects of maritime targets by using generalized learning ability for high-dimensional features. Based on the micro-motion model of maritime targets, two-dimensional time-frequency maps of four types of micro-motion signals are constructed in the measured sea clutter background. These maps were used as training and test datasets. Furthermore, three types of CNN models, i.e., LeNet, AlexNet, and GoogleNet, are used in binary detection and multiple micro-motion classifications. The effects of signal-to-noise ratio on detection and classification performance are also studied. Compared with the traditional support vector machine method, the proposed method can learn the micro-motion features intelligently, and has performed better in detection and classification. Thus, this study can provide a new technical approach for radar target detection and recognition under a cluttered background.