A Survey of Adversarial Attacks on SAR Target Recognition: From Digital Domain to Physical Domain
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摘要: 基于深度神经网络的合成孔径雷达(SAR)图像目标识别已成为SAR应用领域的研究热点和前沿方向。然而,有研究指出深度神经网络模型易受到对抗样本攻击。对抗样本定义为在数据集内故意引入微小扰动所产生的输入样本,这种扰动足以使模型高信度地产生错误判断。现有SAR对抗样本生成技术本质上仅作用于二维图像,即为数字域对抗样本。尽管近期有部分研究开始将SAR成像散射机理考虑用于对抗样本生成,但是仍然存在两个重要缺陷,一是仅在SAR图像上考虑成像散射机理,而没有将其置于SAR实际成像过程中进行考虑;二是在机制上无法实现三维物理域的攻击,即只实现了伪物理域对抗攻击。该文对SAR智能识别对抗攻击的技术现状和发展趋势进行了研究。首先,详细梳理了传统SAR图像对抗样本技术的发展脉络,并对各类技术的特点进行了对比分析,总结了现有技术存在的不足;其次,从SAR成像原理和实际过程出发,提出了物理域对抗攻击技术,通过调整目标物体的后向散射特性,或通过发射振幅和相位精细可调的干扰信号来实现对SAR智能识别算法对抗攻击的新思路,并展望了SAR对抗攻击在物理域下的具体实现方式;最后,进一步讨论了未来SAR智能对抗攻击技术的发展方向。
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关键词:
- 对抗样本 /
- 合成孔径雷达(SAR) /
- SAR目标识别 /
- 物理域对抗攻击 /
- 深度神经网络(DNN)
Abstract: Deep Neural Network (DNN)-based Synthetic Aperture Radar (SAR) image target recognition has become a prominent area of interest in SAR applications. However, deep neural network models are vulnerable to adversarial example attacks. Adversarial examples are input samples that introduce minute perturbations within the dataset, causing the model to make highly confident yet incorrect judgments. Existing generation techniques of SAR adversarial examples fundamentally operate on two-dimensional images, which are classified as digital-domain adversarial examples. Although recent research has started to incorporate SAR imaging scattering mechanisms in adversarial example generation, two important flaws still remain: (1) imaging scattering mechanisms are only applied to SAR images without being integrated into the actual SAR imaging process, and (2) the mechanisms achieve only pseudo-physical-domain adversarial attacks, failing to realize true three-dimensional physical-domain adversarial attacks. This study investigates the current state and development trends in adversarial attacks on SAR intelligent target recognition. First, the development trajectory of traditional generation technologies of SAR-image adversarial examples is meticulously traced and a comparative analysis of various technologies is conducted, thus summarizing their deficiencies. Building on the principles and actual processes of SAR imaging, physical-domain adversarial attack techniques are then proposed. These techniques manipulate the target object’s backscattering properties or emit finely adjustable interference signals in amplitude and phase to counter SAR intelligent target recognition algorithms. The paper also envisions practical implementations of SAR adversarial attacks in the physical domain. Finally, this paper concludes by discussing the future directions of SAR intelligent adversarial attack technologies. -
表 1 数字域SAR图像对抗样本生成方法
Table 1. Digital domain SAR image adversarial example generation method
攻击方式 扰动范围 具体分类 攻击原理 方法代表 SAR灰度图像攻击 全局对抗扰动 基于梯度的攻击方法 利用目标识别模型的梯度信息生成对抗样本 FGSM[50−52]
BIM[56]
ILCM[57]
IMGS[59]
NAA[60]
PGD[62]
JSMA[50]基于优化的攻击方法 优化损失函数来生成对抗样本 C&W[7]
EAD[7]
Fast C&W[8]
One-pixel[50]
CRFA[68]基于边界的攻击方法 利用搜索等优化算法来生成对抗样本,
使其跨越目标识别模型决策边界DeepFool[7]
HJSA[7]
UAP[72,73]
DBA[9]
FDA[75]基于GAN的攻击方法 训练一个生成对抗网络(GAN)来生成对抗样本 AdvGAN[10]
Attack-UNet-GAN[11]
TAN[82]
TUAN[83]基于迁移的攻击方法 对目标模型的替理模型发起攻击,生成具有迁移性的对抗样本并成功攻击目标模型 SFA[85]
PFWA[86]
FBUA[87]
TSAA[88]
TEA[89]
TBAA[90]
ITINFA[91]局部对抗扰动 基于稀疏的攻击方法 结合SAR图像特征的稀疏性,将扰动重点放在目标区域 Sparse-RS[92]
SparseFool[92]
ConnerSearch[92]
DE-JSMA[96]基于优化的攻击方法 注入目标掩模限制扰动区域,并通过优化损失函数
来生成对抗样本TRPG[97] 构造小扰动范围损失限制扰动区域,并通过优化损失函数来生成对抗样本 文献[99] 基于梯度的攻击方法 利用基于梯度的扰动生成器实施散斑变体攻击,并通过目标区域提取器限制扰动区域 SVA[101] 基于边界的攻击方法 计算模型的注意力热图定位SAR图像中与识别结果高度相关的目标区域,并在该区域生成通用扰动 ULAN[100] 基于补丁的攻击方法 在SAR图像中插入特制补丁图案,诱导模型做出错误
的决策或识别SAR Sticker[103]
Target Partial-Occlusion[104]
RaLP[106]SAR复数图像攻击 局部对抗攻击 基于GAN的攻击方法 训练一个复数形式的生成对抗网络(GAN)来生成
频域复数图像对抗样本文献[110] 基于优化的攻击方法 在频域空间中通过优化的攻击方法来优化流场从而在
复数图像上生成对抗样本文献[112] 表 2 伪物理域SAR图像对抗攻击方法分类
Table 2. Pseudo-physical domain SAR image adversarial attack method
表 3 不同类型的攻击方法在SAR成像链路中添加扰动的位置
Table 3. Different types of attack methods add perturbations to the SAR imaging link
成像链路 数字域 伪物理域 物理域 信号发射 × × × 目标响应 × × √ 信号回波 × × √ 信号处理 × × × 成像处理 × × × 成像结果 √ √ × 表 4 对抗攻击结果
Table 4. Adversarial attack results
平均分类分数(T72) 平均分类分数(BMP2) 分类准确
率(%)攻击成功
率(%)干净样本 0.975 0.024 100 —— 添加角反射器 0.852 0.148 87.8 12.2 改变角反射器
反射系数0.727 0.273 84.4 15.6 改变角反射器
散射系数0.263 0.736 27.8 72.2 改变角反射器
表面粗糙度0.165 0.833 14.4 85.6 表 5 不同目标类别攻击成功率
Table 5. Attack success rate of different target categories
Model Attack 2S1 BMP2 BRDM_2 BTR_60 T72 ZIL-131 ZSU-23-4 A AlexNet Original 2.50 1.39 10.00 2.22 1.67 0.00 0.00 2.54 Random 5.56 3.89 22.22 3.61 1.39 0.00 0.83 5.36 UAP 36.67 2.78 81.11 83.06 87.22 35.83 39.17 52.26 Patch 26.67 1.39 33.89 77.78 36.67 29.44 5.83 30.24 SAR-SPA 95.28 95.56 83.33 85.83 81.94 35.56 45.17 74.67 GoogLeNet Original 6.39 1.67 6.67 4.17 2.78 1.11 1.39 3.45 Random 5.56 3.33 8.06 4.17 2.78 1.67 2.50 4.01 UAP 40.83 32.22 13.33 9.44 78.89 16.67 32.50 31.98 Patch 34.44 1.67 12.22 45.56 27.50 15.00 3.89 20.04 SAR-SPA 72.50 86.67 80.56 81.94 77.78 35.83 42.50 68.25 VGG16 Original 1.39 0.56 10.00 2.78 0.28 0.00 2.50 2.50 Random 1.67 2.22 11.67 5.28 0.28 0.56 1.11 3.26 UAP 20.28 0.00 14.17 26.67 7.50 1.39 30.83 14.41 Patch 38.61 0.00 15.28 46.94 5.00 11.67 10.83 18.33 SAR-SPA 65.00 76.94 79.44 81.39 69.44 33.06 36.11 63.05 ResNet50 Original 1.39 0.56 6.39 5.28 0.28 0.00 0.00 1.99 Random 1.67 1.11 7.78 2.50 0.28 0.00 1.39 2.10 UAP 91.39 81.39 98.89 73.33 81.11 32.50 45.83 72.06 Patch 46.94 2.50 31.67 56.11 37.22 34.72 0.28 29.92 SAR-SPA 95.83 93.33 98.06 83.89 87.22 32.50 46.39 76.75 InceptionV3 Original 14.17 1.67 11.11 8.06 3.06 0.00 0.00 5.44 Random 7.50 1.94 6.67 5.83 1.94 0.00 0.28 3.45 UAP 45.83 77.22 62.78 8.89 53.61 43.05 34.44 46.55 Patch 60.56 5.00 43.89 60.28 43.33 30.83 2.22 35.16 SAR-SPA 58.33 83.06 75.28 72.50 60.28 35.28 35.00 59.96 MobileNetV2 Original 4.44 0.28 5.00 3.06 0.00 0.00 0.00 1.83 Random 5.28 1.94 6.39 4.44 0.56 0.00 0.28 2.70 UAP 74.17 76.39 75.28 66.11 66.39 30.28 37.22 60.83 Patch 3.33 53.89 26.39 24.17 9.72 8.89 7.50 19.13 SAR-SPA 81.67 76.39 77.68 73.06 78.61 31.11 42.22 65.82 ShuffleNetV2 Original 2.50 0.00 3.61 1.39 0.28 0.00 0.00 1.11 Random 3.06 1.67 5.28 3.05 0.00 0.00 0.56 1.95 UAP 70.56 69.44 82.50 76.67 91.94 33.89 36.11 65.87 Patch 11.39 26.94 37.78 21.11 18.33 20.56 3.06 19.88 SAR-SPA 81.94 79.72 91.67 86.39 96.67 45.28 47.78 75.64 EfficinetNetV2 Original 8.06 0.00 3.33 0.83 0.00 0.00 0.00 1.75 Random 8.61 0.28 3.33 2.78 0.28 0.00 0.00 2.18 UAP 91.67 78.06 82.78 63.33 76.94 9.17 90.00 70.28 Patch 37.78 0.28 9.17 26.67 16.11 4.17 6.94 14.45 SAR-SPA 98.33 95.83 98.61 91.84 97.50 45.83 49.72 82.52 Vision Transformer Original 0.83 0.00 3.06 3.33 0.56 0.00 0.00 1.11 Random 1.11 0.56 3.61 3.89 0.56 0.00 0.00 1.39 UAP 9.17 22.78 33.89 26.94 14.17 2.78 4.72 16.35 Patch 48.33 30.56 11.67 20.56 10.00 3.61 12.50 19.60 SAR-SPA 14.72 21.94 19.17 15.83 17.22 8.61 9.17 15.24 Swin Transformer Original 0.00 0.00 4.17 0.00 0.00 0.00 0.00 0.60 Random 0.56 0.83 5.00 0.28 0.00 0.00 0.00 0.95 UAP 48.33 21.67 14.44 42.50 20.00 4.17 30.28 25.91 Patch 32.50 45.22 43.61 25.28 44.72 11.11 15.56 31.14 SAR-SPA 38.06 41.39 32.22 38.06 33.33 18.06 15.83 30.99 注:加粗数值 表 6 不同攻击方法攻击成功率(%)
Table 6. Attack success rate of different attack methods (%)
Model Original FGSM JSMA One-pixel One-pixel+OTSU SAR-PTAMA LeNet 2.79 60.53 93.09 9.07 5.51 34.08 AlexNet 5.41 35.56 92.57 16.70 12.19 29.40 GoogLeNet 0.68 55.53 82.78 35.60 8.31 22.81 VGG16 1.72 55.41 88.29 5.19 2.88 24.21 ResNet50 2.43 45.03 41.03 17.54 15.34 18.10 -
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