Aerial threat assessment is a crucial link in modern air combat, whose result counts a great deal for commanders to make decisions. With the consideration that the existing threat assessment methods have difficulties ...Aerial threat assessment is a crucial link in modern air combat, whose result counts a great deal for commanders to make decisions. With the consideration that the existing threat assessment methods have difficulties in dealing with high dimensional time series target data, a threat assessment method based on self-attention mechanism and gated recurrent unit(SAGRU) is proposed. Firstly, a threat feature system including air combat situations and capability features is established. Moreover, a data augmentation process based on fractional Fourier transform(FRFT) is applied to extract more valuable information from time series situation features. Furthermore, aiming to capture key characteristics of battlefield evolution, a bidirectional GRU and SA mechanisms are designed for enhanced features.Subsequently, after the concatenation of the processed air combat situation and capability features, the target threat level will be predicted by fully connected neural layers and the softmax classifier. Finally, in order to validate this model, an air combat dataset generated by a combat simulation system is introduced for model training and testing. The comparison experiments show the proposed model has structural rationality and can perform threat assessment faster and more accurately than the other existing models based on deep learning.展开更多
针对锂离子电池健康状态(state of health,SOH)预测,提出了一种基于概率化稀疏自注意力机制(probsparseself-attentionmechanism,PSM)和长短期记忆(longshort-term memory,LSTM)神经网络的预测模型。首先,提取锂离子电池容量数据并进行...针对锂离子电池健康状态(state of health,SOH)预测,提出了一种基于概率化稀疏自注意力机制(probsparseself-attentionmechanism,PSM)和长短期记忆(longshort-term memory,LSTM)神经网络的预测模型。首先,提取锂离子电池容量数据并进行窗口化处理,利用位置嵌入获取高维数据之间的特征信息并对数据进行位置编码。然后,引入PSM对输入数据的权重进行稀疏性判断,增加对SOH预测具有关键影响的因素的权重。最后,利用LSTM神经网络捕获数据之间的时序特征进行锂离子电池SOH预测。实验结果表明,与其他常用的锂离子电池SOH预测模型相比,所提模型可以减少预测误差,具有更好的预测性能。展开更多
基金supported by the National Natural Science Foundation of China (6202201562088101)+1 种基金Shanghai Municipal Science and Technology Major Project (2021SHZDZX0100)Shanghai Municip al Commission of Science and Technology Project (19511132101)。
文摘Aerial threat assessment is a crucial link in modern air combat, whose result counts a great deal for commanders to make decisions. With the consideration that the existing threat assessment methods have difficulties in dealing with high dimensional time series target data, a threat assessment method based on self-attention mechanism and gated recurrent unit(SAGRU) is proposed. Firstly, a threat feature system including air combat situations and capability features is established. Moreover, a data augmentation process based on fractional Fourier transform(FRFT) is applied to extract more valuable information from time series situation features. Furthermore, aiming to capture key characteristics of battlefield evolution, a bidirectional GRU and SA mechanisms are designed for enhanced features.Subsequently, after the concatenation of the processed air combat situation and capability features, the target threat level will be predicted by fully connected neural layers and the softmax classifier. Finally, in order to validate this model, an air combat dataset generated by a combat simulation system is introduced for model training and testing. The comparison experiments show the proposed model has structural rationality and can perform threat assessment faster and more accurately than the other existing models based on deep learning.
文摘针对锂离子电池健康状态(state of health,SOH)预测,提出了一种基于概率化稀疏自注意力机制(probsparseself-attentionmechanism,PSM)和长短期记忆(longshort-term memory,LSTM)神经网络的预测模型。首先,提取锂离子电池容量数据并进行窗口化处理,利用位置嵌入获取高维数据之间的特征信息并对数据进行位置编码。然后,引入PSM对输入数据的权重进行稀疏性判断,增加对SOH预测具有关键影响的因素的权重。最后,利用LSTM神经网络捕获数据之间的时序特征进行锂离子电池SOH预测。实验结果表明,与其他常用的锂离子电池SOH预测模型相比,所提模型可以减少预测误差,具有更好的预测性能。
