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摘要: 强海杂波与海面目标的复杂特性使得海面目标回波微弱，有效的海杂波抑制和稳健快速的目标检测是雷达对海上目标探测需考虑的重要因素。然而，现有的海面目标检测算法对于复杂环境下的目标检测性能有限，环境和目标特性适应性差。该文设计了一种杂波抑制和目标检测融合网络(INet)，通过层归一化-传递和连接方法提取关键目标特征，采用注意力网络抑制杂波和增强目标，构建跨阶段局部残差网络保证检测网络的轻量化和准确性。基于导航雷达在多种观测条件下采集的回波数据，构建了海面目标雷达图像数据集；通过模型的预训练和平面位置显示器(PPI)图像的帧间积累对INet进行了优化，得到了Optimized INet(O-INet)模型。经过多种天气条件下实测数据测试和验证，并与YOLOv3, YOLOv4，双参数CFAR和二维CA-CFAR对比后证明，所提方法在提高检测概率、降低虚警率和复杂条件下的强泛化能力有显著优势。Abstract: A marine radar device is a major navigation tool for boaters and ships. The images produced by marine radars detect not only hard targets such as ships and coastlines, but also reflections from the sea surface, known as sea clutter. The strong sea clutter and the complex characteristics of marine targets result in transmission of weak echo signals of the images to the radar, which makes difficult for radars to distinguish and analyze. So, effective sea clutter suppression and robust, fast target detection mechanisms are needed for radar to detect marine targets efficiently. However, the existing marine target detection algorithms have limited performance for target detection under complex environments, and have poor adaptability to environment and target characteristics. In this paper, an Integrated Network (INet) for clutter suppression and target detection algorithm is proposed and designed to optimize the signals received from the targets. The layer normalization algorithm integrated with transfer function is used to extract key target features, and the spatial attention network is used to suppress the clutter and to enhance the target signals, and a local cross-scale residual network is built to ensure the weightlessness of the system and accuracy of the detection network. Based on the echo data collected by the navigation radar under various observation conditions, radar images with marine target dataset were constructed. INet was optimized through pre-training of the model and inter-frame accumulation of Plan Position Indicator (PPI) images to obtain the Optimized INet (O-INet). The measured data were verified, tested, and compared with data obtained through various algorithms such as YOLOv3, YOLOv4, two-parameter CFAR, and two-dimensional CA-CFAR. The results obtained prove that the proposed method has superior advantages over other methods in improving detection probability, reducing false alarm rate, and strong generalization ability under complex conditions.
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图 6 Part Ⅰ 杂波抑制网络的部分特征图
Figure 6. Feature maps of the clutter suppression network in Part Ⅰ
图 7 模型优化前后的对比(Data_03#)
Figure 7. Comparison before and after model optimization (Data_03#)
图 8 低海况简单背景下的动目标(Data_01#)检测
Figure 8. Moving target detection under simple background of low sea state (Data_01#)
图 9 低海况复杂背景下的动目标(Data_02#)检测
Figure 9. Moving target detection under complex background of low sea state (Data_02#)
图 10 高海况下的多目标(Data_03#)检测
Figure 10. Multi-target detection under high sea conditions (Data_03#)
图 11 大雪下的多目标(Data_04#)检测
Figure 11. Multi-target detection under heavy snow (Data_04#)
图 12 中雨下的多目标(Data_05#)检测结果对比
Figure 12. Comparison of multi-target detection results under rain weather (Data_05#)
图 13 低海况简单背景下的动目标(Data_01#)检测结果对比
Figure 13. Comparison of moving targets under simple background of low sea state (Data_01#)
图 14 低海况复杂背景下的动目标(Data_02#)检测结果对比
Figure 14. Moving target detection under complex background of low sea state (Data_02#)
图 15 高海况下的多目标(Data_03#)检测结果对比
Figure 15. Multi-target detection under high sea conditions (Data_03#)
图 16 大雪下的多目标(Data_04#)检测结果对比
Figure 16. Multi-target detection under heavy snow (Data_04#)
图 17 中雨下的动目标(Data_05#)检测结果对比
Figure 17. Comparison of multi-target detection results under rain weather (Data_05#)
图 18 高海况下的多目标(Data_03#)检测结果
Figure 18. Multi-target detection results under high sea conditions (Data_03#)
表 1 实时验证数据集参数
Table 1. Parameters of real-time verification dataset
数据编号 目标数量 目标尺度 目标速度 海况 背景 PPI视频帧数 Data_01# 3 中型船 中速 2级 海杂波较弱 150 Data_02# 2 中、小型船 低速 2级 地杂波较弱 150 Data_03# 9 中、小型船 低速 4级 海杂波较强 50 Data_04# 5 中、小型船 低速 4级 大雪 50 Data_05# 2 中、小型船 低速 4级 中雨 50 
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表 3 INet模型优化结果对比
Table 3. Comparison of optimization results
算法 简称 Recall (%) FA (%) 平均速度(FPS) INet INet 91.12 1.12 9.12 INet(预训练) \ 92.27 0.37 9.04 INet +帧间积累 \ 91.55 0.59 9.03 INet (预训练)
+帧间积累O-INet 92.73 0.33 8.79
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表 5 对测试集的检测结果(%)
Table 5. Test results about the test dataset (%)
方法 Pfa=10–4 Pfa=10–3 Pfa=10–2 非相参积累+双参数CFAR 16.94 42.52 57.71 非相参积累+二维 CA-CFAR 18.25 37.76 54.29 O-INet 80.98 91.04 93.65
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