ID 原文 译文
14615 针对这一问题,首先采用栈式自编码器对中频数据进行降维和特征提取;然后在降维后的特征空间内通过多种过采样方法生成新的少数类样本,使数据集重新平衡,并利用再平衡后的数据集训练支持向量机分类器。 To solve this problem,this paper uses stacked autoencoder to reduce the dimension and extract the features from the intermediate frequency data,and then generates a few new samples in the reduced dimension feature space by various over-sampling methods,so that the data set is rebalanced. Then the support vector machine classifier istrained by the rebalanced data set.
14616 最后采用F分数和受试者工作特征(Receiver Operating Characteristic,ROC)曲线两种评价方法对分类效果进行评价。 Finally,the classification effect is evaluated by F-score and receiver operating characteristic(ROC) curve.
14617 实验结果表明,通过过采样处理,分类器对少数类的识别性能有所提升。 The experimental results show that the performance of the classifier fora few classes is improved through oversampling.
14618 从现代战争中的通信电子战系统指挥决策需求角度出发,给出了建立通信电子战系统模型的一种思路,为系统效能评估提供建设性的依据。 From the perspective of communication and electronic warfare system command decision-makingrequirements in modern warfare,some methods for establishing a communication electronic warfare systemmodel are provided,and a constructive basis for system effectiveness evaluation is given.
14619 通过分析通信电子战系统与通信组网目标特点,建立了基于随机服务系统理论(排队论)的不考虑复杂战术背景的通信电子战模型,并根据实际运用情况考虑串联型和协同型运用方式分别建模。 By analyzing thecharacteristics of communication electronic warfare systems and communication network targets,a communication electronic warfare model based on random service system theory(queuing theory) is established,inwhich the complex tactical backgrounds are not considered,and serial and collaborative application modelsare constructed.
14620 随后,在对目标威胁分级的战术背景下建立了改进模型。 Subsequently,an improved model is established against the tactical background of gradingtarget threats.
14621 最后,通过构建实际算例进行分析,比较了不同条件下系统效能参数曲线,得出对通信电子战系统运用切实有效的指挥决策建议,为电子战指挥员提供了决策参考,表明了模型的有效性。 Finally,by constructing actual calculation examples for analysis and comparing the system efficiency parameter curves under different conditions,the practical and effective command decision-makingrecommendations for the communication electronic warfare system are obtained,which provides the decision-making reference for the electronic warfare commander and shows the effectiveness of the model.
14622 针对直升机卫星通信系统中直升机旋翼对通信信道造成的周期性衰落问题,采用射频收发器AD9361模拟了信道周期性衰落模型,基于此模型在现场可编程门阵列(Field Programmable Gate Array,FPGA)上优化并实现了缝隙检测算法。 For the periodic fading problem caused by helicopter rotor to communication channel in helicop ter satellite communication system . the radio frequency transceiver AD9361 is used to simulate the periodic fading model of channel. Based on this model,the crack detection algorithm is optimized and implemented on field programmable gate array( FPGA).
14623 根据信道衰落模型和缝隙检测算法及数据链路速率和带宽的要求,提出了一套直升机卫星通信系统可靠通信方案,即前向链路采用重发和分集接收及短码LDPC编码技术,返向链路根据前向链路缝隙检测的结果在无遮挡缝隙采用突发通信和长码低密度奇偶校验(Low Density Parity Check,LDPC)编码技术,实现可靠通信。 A reliable communication scheme for helicopter satellite commu. nication system is proposed according to channel fading model,crack detection algorithm and the require. ments of data link rate and bandwidth. The forward link uses retransmission, diversity reception and short code low density parity check( LDPC) coding technology and the reverse link uses burst communicatior and long code LDPC coding technology according to the results of crack detection of forward link.
14624 系统测试结果表明,该方案不受直升机机型限制,系统可在40%遮挡率下实现前向链路25.6 kb/s和返向链路4 Mb/s速率下的可靠通信。 The sys tem test results show that,the scheme is not limited by helicopter type,and the system can realize reliable communication at forward link 25.6 kb/s and reverse link 4 Mb/s under 40% shielding rate.