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VHF频段宽带大功率LDMOS功放电路的设计与实现 被引量:1
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作者 夏达 孙卫忠 《现代雷达》 CSCD 北大核心 2014年第5期88-91,共4页
介绍了一种VHF频段宽带大功率LDMOS功放的设计方法,使用ADS仿真软件对其大信号模型的阻抗参数进行了提取,通过宽带巴伦匹配技术实现了匹配电路的设计。利用谐波平衡法对功放电路的增益和效率指标进行仿真,并与实物测试数据对比,验证了... 介绍了一种VHF频段宽带大功率LDMOS功放的设计方法,使用ADS仿真软件对其大信号模型的阻抗参数进行了提取,通过宽带巴伦匹配技术实现了匹配电路的设计。利用谐波平衡法对功放电路的增益和效率指标进行仿真,并与实物测试数据对比,验证了设计方法的可行性。该功放电路在VHF频段100%相对带宽内,实现输出功率大于1 000 W,效率高于70%,带内波动优于1 dB的指标。文中为VHF频段宽带大功率LDMOS功放电路的设计提供了一种可行的设计方法,可应用于同类型功放电路的设计中,具有广阔的工程应用前景。 展开更多
关键词 甚高频 横向扩散金属氧化物半导体 宽带巴伦 自动相关监测
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ADS-B Anomaly Data Detection Model Based on Deep Learning and Difference of Gaussian Approach 被引量:6
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作者 WANG Ershen SONG Yuanshang +5 位作者 XU Song GUO Jing HONG Chen QU Pingping PANG Tao ZHANG Jiantong 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第4期550-561,共12页
Due to the influence of terrain structure,meteorological conditions and various factors,there are anomalous data in automatic dependent surveillance-broadcast(ADS-B)message.The ADS-B equipment can be used for position... Due to the influence of terrain structure,meteorological conditions and various factors,there are anomalous data in automatic dependent surveillance-broadcast(ADS-B)message.The ADS-B equipment can be used for positioning of general aviation aircraft.Aim to acquire the accurate position information of aircraft and detect anomaly data,the ADS-B anomaly data detection model based on deep learning and difference of Gaussian(DoG)approach is proposed.First,according to the characteristic of ADS-B data,the ADS-B position data are transformed into the coordinate system.And the origin of the coordinate system is set up as the take-off point.Then,based on the kinematic principle,the ADS-B anomaly data can be removed.Moreover,the details of the ADS-B position data can be got by the DoG approach.Finally,the long short-term memory(LSTM)neural network is used to optimize the recurrent neural network(RNN)with severe gradient reduction for processing ADS-B data.The position data of ADS-B are reconstructed by the sequence to sequence(seq2seq)model which is composed of LSTM neural network,and the reconstruction error is used to detect the anomalous data.Based on the real flight data of general aviation aircraft,the simulation results show that the anomaly data can be detected effectively by the proposed method of reconstructing ADS-B data with the seq2seq model,and its running time is reduced.Compared with the RNN,the accuracy of anomaly detection is increased by 2.7%.The performance of the proposed model is better than that of the traditional anomaly detection models. 展开更多
关键词 general aviation aircraft automatic dependent surveillance-broadcast(ADS-B) anomaly data detection deep learning difference of Gaussian(DoG) long short-term memory(LSTM)
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自组织时分多址接续系统的吞吐模型 被引量:1
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作者 王飞舟 张英俊 范成梁 《大连海事大学学报》 CAS CSCD 北大核心 2002年第2期43-47,共5页
基于自组织时分多址接续协议的自动相关监测技术即将全面应用于空中和海上交通管制领域 ,研究了误码自组织时分多址接续系统动态预约的影响机制 ,提出了用于描述有扰信道中自组织时分多址接续系统吞吐特性的马尔可夫随机过程模型 ,并导... 基于自组织时分多址接续协议的自动相关监测技术即将全面应用于空中和海上交通管制领域 ,研究了误码自组织时分多址接续系统动态预约的影响机制 ,提出了用于描述有扰信道中自组织时分多址接续系统吞吐特性的马尔可夫随机过程模型 ,并导出自组织时分多址接续系统吞吐率的算法 . 展开更多
关键词 自组织时分多址接续系统 吞吐模型 交通管制 自动相关监测 吞吐率 STDMA 通信协议 船舶 飞机
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