摘要：研究安全网关配置特点后提出一种新的安全网关模型-函数模型,并在此基础上提出了函数模型IPv6安全网关策略配置的结构。通过系统的实现与实际运行结果比较分析,证明这种方法能够起到配置简单、安全、配置重复利用等特点。对IPv6安全网关系统设计具有借鉴作用,同时提出服务元、服务域、主机元、主机域的概念,对现有的安全网关图形界面开发,配置与维护具有很大的启示。

摘要：The disguised covert detection method that imitates whale calls has received great attention in recent years because it can solve the traditional problem of the trade-off between long-range detection and covert ***,under strong reverberation conditions,traditional echo signal processing methods based on matched filtering will be greatly *** on this,a disguised sonar signal waveform design is proposed based on imitating whale calls and computationally efficient anti-reverberation echo signal processing ***,this article proposed a disguised sonar signal waveform design method based on imitating whale *** method uses linear frequency modulation(LFM)signals to replace LFM-like segments in real whale calls,and extracts the envelope of the real whale call’s LFM-like segment to modify the LFM ***,this article proposed an echo signal processing method of fractional Fourier transform(FrFT)based on target echo locating of synchronization *** method uses the synchronization signal to locate the target echo,and determines the step-size interval of the FrFT based on the information carried by the synchronization *** with the traditional FrFT,this method effectively reduces the amount of calculation and also improves the anti-reverberation ***,the excellent performance of the proposed method is verified by simulation results.

摘要：目的 麦克风阵列方法应用于电子耳蜗会产生延迟参数的分数实现,针对此问题着重研究了分数延迟滤波器的设计及失配特征,以适应电子耳蜗分数延迟实现的需求.方法 结合电子耳蜗小间距的特征以及延时需求,采用最小均方插值方法设计分数延迟滤波器.结果 基于最小均方插值的分数延迟方法可实现分数延迟,且可最小化全频带的平均误差和均方误差.结论 基于最小均方插值的分数延迟滤波器的失配特征及高阶情形的误差平坦特征具有理论和工程价值,可为分数延迟滤波器的设计提供参数选取方法.

摘要：In order to achieve high precision measurement of inductance in a wide frequency range,a method of inductance measurement based on double-excitation auto-balancing bridge is *** this method,the direct digital synthesizer(DDS)as signal generator is used as the bridge excitation source,and the bridge is automatically balanced by adjusting and measuring the voltage *** standard resistors,the system can achieve high precision measurement of four-terminal pair inductors in the frequency range of *** at the low efficiency of bridge balancing,an iterative balancing algorithm based on the steepest descent method is *** order to suppress the interference caused by the initial phase change and non-integer periodic sampling,the high-precision measurement of the complex impedance of inductance is realized based on the all-phase fast Fourier transform(apFFT).Finally,the corresponding measurement system is built and the inductance measurement experiment is carried *** experimental results show that the relative error of the system for inductance measurement can be as low as 0.009%,and the optimal relative measurement uncertainty of the system can reach 9.89×10^(-4)compared with 5×10^(-5)of commercial impedance analyzer.

摘要：当无线电通信受到干扰或要求无线电静默时,在森林作战的武装队伍之间将无法进行命令和情报传递。因此,亟需一种可以代替无线电通信的通信方式用于传输重要信息。针对这一需求,提出了一种新型的隐蔽声通信方法,该方法通过模仿动物的叫声来编码通信信息,并以绣眼鸟的叫声为例,利用绣眼鸟的叫声音节和音节之间的时间间隔来编码通信信息。为了减少译码计算量并提高编码效率,设计了一种基于时频特征的音节分组方法。同时,采用多种策略使得编码后的通信脉冲序列与真实铜蓝鹟叫声尽可能相似,以提高隐蔽性能,并通过实验验证在距离不超过60 m时,通信误码率不超过2%。最后,介绍了该通信方法的模型,并分析了在实际应用中可能遇到的问题,以及解决方案和未来的发展方向。研究结果表明,本方法可实现无线电不可用情况下的信息隐蔽传递。