GBSAR Omega-K algorithm ResNet18 Rotated-SARShip dataset (RSSD) SAR SAR dataset SAR image SAR ship detection SAR target detection STEM education UAVSAR anchor free arbitrary-oriented ship detection attention-weighted feature fusion attention-weighted feature pyramid network bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues::TBX History of engineering & technology building extraction computational thinking computational tools computer vision conditional generative adversarial nets (CGANs) convolutional neural networks deep convolutional neural network deep learning despeckling development of games differentiable rotational IoU algorithm enhanced U-Net guided anchor Siamese network (GASN)