Maritime targets classification based on CNN using Gaofen-3 SAR images

Abstract

The classification and detection of maritime targets are widely used in shipping navigation and military fields. With the development of spaceborne synthetic aperture radar (SAR) technology, more and more very high-resolution SAR images can be acquired for maritime targets recognition. However, due to the different imaging mechanisms between SAR images and optical images, it is difficult and laborious to interpret SAR images manually. This study uses a modified Alexnet structure to realise maritime targets classification on the Gaofen-3 spaceborne SAR images. The maritime targets dataset (MTD), including boats, cargo ships, container ships, windmills, oil tankers, and iron towers, is conducted. Moreover, the proposed convolution neural networks (CNNs) structure is trained and tested on the MTD. Experimental results show that the model can get an accuracy of 92.10% in classifying the six kinds of targets, and the performance is superior compared with other CNNs and traditional supportive vector machine algorithms.

Keywords

• support vector machines
• image classification
• radar imaging
• spaceborne radar
• synthetic aperture radar
• object detection
• convolutional neural nets
• gaofen-3 sar images
• shipping navigation
• spaceborne synthetic aperture radar technology
• high-resolution sar images
• maritime targets recognition
• optical images
• modified alexnet structure
• maritime targets classification
• gaofen-3 spaceborne sar images
• cargo ships
• container ships
• convolution neural networks structure
• maritime target detection
• military fields
• maritime targets dataset
• windmills
• oil tankers
• iron towers
• supportive vector machine