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Sea Clutter Spectral Parameters Prediction and Influence Factor Analysis Based on Deep Learning
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摘要: 该文基于不同雷达参数和海洋环境参数条件下的岸基雷达海杂波实测数据，利用深度神经网络(DNN)建模技术，建立了从多个测量条件参数出发的海杂波多普勒谱参数预测模型，实现了独立于杂波数据、基于环境特征的海杂波谱特征认知，谱频移和展宽的预测精度达90%以上。基于该预测模型，该文提出了一种基于参数循环递减认知的多普勒谱影响因素分析方法，分析了不同测量参数对海杂波多普勒谱预测的影响，得到了谱参数随主要影响因素的变化规律，结果对基于多普勒特征的海面目标检测应用具有重要意义。Abstract: Using Deep Neural Network (DNN) modeling technology, a prediction model of Doppler spectral parameters of sea clutter based on multiple measurement conditions is established based on measured data of sea clutter from shore-based radar under different radar parameters and marine environmental parameters. The recognition of sea clutter spectral characteristics based on environmental characteristics and independent of clutter data is realized. The spectral frequency shift and broadening prediction accuracy are greater than 90%. Based on the prediction model, an analysis method of Doppler spectrum influence factors based on the parameter cycle decreasing cognition is proposed. The influence of different measurement parameters on the Doppler spectrum prediction of sea clutter is analyzed, and the change law of spectrum parameters with the main influence factors is obtained. The results are of great significance to the application of sea surface target detection based on Doppler characteristics.
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Key words:
- Sea clutter /
- Doppler spectrum /
- Deep Neural Network (DNN) /
- Influence factors /
- Prediction model
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图 2 海杂波多普勒谱参数的提取流程
Figure 2. Extraction process of Doppler spectral parameters of sea clutter
图 3 试验数据中风浪流方向的关系
Figure 3. Relationship between wind, wave and current direction in test data
图 4 海杂波谱参数预测模型架构
Figure 4. Prediction model framework of sea clutter spectral parameters
图 6 基于DNN-5模型的谱参数预测散点图
Figure 6. Scatter plot of spectral parameter prediction based on DNN-5 model
图 7 基于DNN-5模型的频移谱宽预测误差分布图
Figure 7. Error distribution of Doppler parameter prediction based on DNN-5 model
图 8 基于循环递减认知的谱参数影响分析流程
Figure 8. Influence analysis process of spectral parameters based on cyclic decreasing cognition
图 9 多普勒参数影响因子统计图
Figure 9. Statistical chart of influence factors of Doppler parameters
图 10 主影响因素变化趋势拟合图
Figure 10. Fitting diagram of change trend of main influencing factors
表 1 Ku波段海杂波数据集信息
Table 1. Ku band sea clutter dataset information
海情等级 HH极化(组) VV极化(组) 总数(组) 1 18675 16165 34840 2 28356 23726 52082 3 6942 11499 18441 合计 53973 51390 105363 
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表 2 海杂波谱参数预测训练数据集组成形式
Table 2. Composition of training data set for prediction of sea clutter spectral parameters
参数 符号 输入 擦地角 $ \theta $ 极化 Pol 带宽 B 有效浪高 $ {H_{{\text{ave}}}} $ 浪向 $ \alpha $ 浪周期 T 流速 $ {v_{\text{f}}} $ 流向 $ \beta $ 风速 ${v_{\rm{s}}}$ 风向 $ \gamma $ 输出 频移 $ {f_{\text{d}}} $ 展宽 $ {B_{\text{w}}} $
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表 3 不同网络的隐层参数设置
Table 3. Hidden layer parameter settings of different networks
模型名称 隐藏层数 激活函数 损失函数 优化函数 DNN-5 5 Leaky ReLU 改进
Huber LossAdam函数 BPNN 2 ReLU RBFNN 2 RBF RNN 4 ReLU SVR 无须训练 KNN
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表 4 各个模型的谱参数预测结果
Table 4. Prediction results of spectral parameters of each model
模型 MAE RMSE $ \eta $ PR $ {f_{\text{d}}} $ $ {B_{\text{w}}} $ $ {f_{\text{d}}} $ $ {B_{\text{w}}} $ $ {f_{\text{d}}} $ $ {B_{\text{w}}} $ $ {f_{\text{d}}} $ $ {B_{\text{w}}} $ SVR 17.46 5.10 22.37 6.78 0.815 0.892 0.749 0.780 KNN 9.87 5.06 12.63 6.69 0.889 0.911 0.926 0.792 DNN-5 8.50 4.58 11.57 6.16 0.913 0.953 0.941 0.827 BPNN 11.97 4.83 16.05 6.53 0.877 0.941 0.877 0.802 RBFNN 9.15 4.60 12.34 6.20 0.905 0.951 0.930 0.819 RNN 10.26 4.67 13.38 6.17 0.887 0.952 0.922 0.826
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表 5 基于循环递减认知方法的DNN-5评价指标
Table 5. Evaluation index of DNN-5 based on the cyclic decreasing cognition method
去掉参数 多普勒频移 多普勒展宽 MAE RMSE PR η $ \varphi $ MAE RMSE PR η $ \varphi $ 擦地角 9.62 13.48 0.916 0.902 1.57 4.87 6.55 0.803 0.949 0.418 极化方式 9.02 12.20 0.937 0.907 1.29 4.77 6.39 0.828 0.950 0.387 带宽 8.90 12.03 0.942 0.909 1.25 4.93 6.62 0.824 0.947 0.418 浪高 9.17 12.23 0.942 0.906 1.31 4.94 6.60 0.823 0.947 0.418 浪向 9.15 12.25 0.943 0.906 1.31 4.91 6.59 0.818 0.947 0.417 浪周期 8.90 11.83 0.942 0.909 1.23 4.90 6.51 0.827 0.948 0.407 流速 9.30 12.56 0.937 0.904 1.38 4.90 6.57 0.824 0.948 0.412 流向 8.76 11.77 0.944 0.910 1.20 4.90 6.57 0.826 0.948 0.411 风速 9.63 13.11 0.931 0.900 1.51 4.86 6.62 0.817 0.948 0.415 风向 9.54 12.75 0.932 0.902 1.45 5.08 6.79 0.819 0.945 0.446
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