城市环境下反无人机技术发展设想

无人机的管控是未来城市低空安全管理不能回避的问题。现有反无人机的探测手段在城市环境下受遮蔽和复杂电磁环境影响,探测设备发挥的效能有限,处置设备又会给日常电磁环境带来影响。本文分析了反无人机技术发展现状及面临的难点问题,结合最新电子信息技术进展,提出未来城市环境下反无人机技术发展设想。     

高速动车组弓网离线放电电磁干扰对L波段雷达的影响分析

随着我国高速铁路的迅速发展,高速铁路电磁干扰对沿线电子设备的影响愈来愈引起人们的关注.目前国内相关高校及科研院所对于该电磁干扰的来源和机理已做了较为深入的研究,得出了一些很有价值的理论成果,但其对雷达的影响程度,尚没有明确的结论.研究通过前期的大量测试数据对列车弓网离线引起的电磁干扰、电磁干扰强度与车速的关系进行统计分析及数学建模,现场测试数据定量分析了此噪声对L波段雷达的影响.通过计算得到了在平原地区条件下(干扰源与受扰雷达之间的电磁波传播路径上无遮挡物,仅存在地面反射),干扰强度与雷达和铁道间距、列车速度之间的关系,得出了雷达的有效防护距离.     

大功率弓网系统瞬态扰动的统计特性分析（英文）

Communication and signaling systems on board can be affected by the transient electromagnetic(EM) disturbances induced by a contact sliding between the catenary and the pantograph.In order to verify the immunity of the embedded communication and signaling systems working in these transient EM disturbances environments,the time and amplitude parameters of the transient disturbances on board are characterized.Measurements are performed on a board of the China railways high-speed(CRH) trains to collect a large amount of radiated and conducted transient EM disturbance information both on the train roof and in the radio frequency(RF) cable.With the ultimate goal of generating transient disturbances scenarios,which are representative of those detected by the antennas and the probe,and performing immunity tests in laboratory conditions,statistical distributions of the transient characteristics of the transients,such as rise time(tr),time duration(td),time interval(ti),and peak amplitude(Ap),are studied.As for radiated transient disturbances,several statistical parameters are obtained from probability density functions(PDFs),which were simulated by MTLAB using the probability density and the estimation methods.Test results are estimated by using the maximum likelihood estimation method with 95% confidence intervals(except time interval).In the conducted transient disturbances tests,both tr(common value of 25~27 ns) and td(0.1~0.4 μs) are greater than that in EN 61000-4-4 while ti(45~55 μs) is far less than that in EN61000-4-4.     

特种任务飞机电子系统的发展趋势

特种任务飞机是一类能够执行空中预警指挥、侦察监视、电子战或反潜等特殊作战任务的飞机,在信息化战争中发挥着重要作用。航空电子系统是集合探测传感器、综合处理、显示控制、通信和武器等软硬件构成的综合电子系统,尤其对于特种任务飞机而言,主要作战任务是由电子系统完成的。文章就航空电子系统的架构发展进行了分析,并对今后特种任务飞机航空电子系统的发展趋势及新技术进行简要论述。