Radio-frequency standardization activities

Adequate standards are essential to the practice of engineering. In no other fieid is this requirement more pressing than in the radio-frequency portion of the spectrum. This paper describes the organizations involved and the processes followed in the generation adoption, and dissemination of Standards Documents concerned with RF measurements. A listing of organization engaged in this activity, current Standards Documents, and work in process included.     

Albumin leakage into the brain and wireless-communication radiation

A series of reports from Lund, Sweden, based on observed leakages of endogenous serum albumin in blood, suggested that repeated exposure to microwave radiation from GSM cellular telephones could alter the permeability of the blood-brain barrier at SARs that were well below the maximum permissible level for cellular telephones. While an effort to confirm had failed at SARs of 0.3-1.5 W/kg, it had confirmed extravasation of serum albumin at 7.5 W/kg: a level about four times greater than the maximum permissible level for cellular telephones. Currently, there is considerable interest from several laboratories around the world in replicating the reported occurrence of abnormal neurons in the rat brain resulting from leakage of endogenous serum albumin.     

Radio-frequency oscillations in thermionic diodes

Radio-frequency oscillations are observed in alkali vapor-filled thermionic diodes at low vapor pressure. A review of the experimental phenomena and attempts at quantitative theoretical understanding is given. Possible applications are for energy conversion and as a diagnostic tool.     

手机泄密防范与对策

针对移动通信系统的不断更新换代,移动终端的功能日渐强大,并支持越来越多的业务,其手机的泄密问题日趋严重,本文就手机的泄密防范与对策进行了研究。首先分析了手机的通信信息传输过程,指出手机终端面临的安全威胁,然后对手机的泄密样式和流程进行分析,并举证一些常见的手机窃密技术与手段,最后对手机的信息安全和防泄密提出了相应对策,以有效提高手机使用者的信息安全防护意识和能力,预防手机泄密。     

弹性体导弹鲁棒控制器设计

基于欧拉-自由梁模型理论得出弹性体导弹横向振动模型,用模态分析方法对模型进行求解。结合弹性导弹的刚体运动方程,得到包括横向振动和刚体运动的增广模型,对该模型进行鲁棒控制器设计,仿真结果表明,所设计的鲁棒控制器能够在保证弹体运动姿态控制的同时抑制横向振动。     

电视遥控制导导弹的作战效能评估

为电视遥控制导导弹的作战效能评估建立了一种可行方案,提出了用目标杀伤概率和达到指定杀伤概率所需导弹数作为评价电视遥控制导导弹靶场效能指标。引入了等效易损体的概念模拟目标毁伤模型,并用目标毁伤模型来计算电视遥控制导导弹的作战效能,最后对影响电视遥控制导导弹作战效能的若干因素进行了分析。     

基于空空导弹的电磁兼容问题仿真研究

由于空空导弹电磁兼容问题频发及其复杂性,其电磁兼容设计尤为重要。弹体的孔缝耦合和弹体内电缆的电磁耦合效应的研究是导弹电磁兼容预测和设计需要解决的两个主要问题。针对这两个问题,进行了电磁计算仿真分析,并研究得到弹体电磁耦合的规律,可在实践中指导导弹的电磁兼容设计。最终实现在导弹的设计初期,就能够对其电磁兼容性进行预测和评估,满足其电磁兼容性的要求。     

寻的导弹导引规律研究

针对寻的导弹的导引问题,建立了导弹和目标相对运动关系的数学模型,推导给出了导弹拦截非机动目标时的最优制导律和拦截机动目标时的最优滑模制导律。通过数字仿真,比较了比例导引律、最优导引律和最优滑模导引律的优缺点。     

空地电视制导导弹作战使用研究

研究空地电视制导导弹的作战使用,包括电视跟踪方式和电视导引头作用距离的影响因素,有利于更好地制定使用该种武器的战术,充分发挥其作战效能。通过ADC法建立的空地导弹的作战效能评估模型表明,与高炮相比,地空导弹的拦截是导弹的主要威胁,选择合适的导弹巡航高度,可以明显改善导弹的安全性能,对于提高空地电视制导导弹的作战效能提供了一种新思路。     

多通道射频连接器国际标准提案介绍

介绍了多通道射频连接器国际标准提案的立项背景以及产品性能参数和特点,该提案包括两种型号产品,即L32-4型4通道射频连接器和L32-5型5通道射频连接器,可以重点应用于移动通信基站的共天馈场景,且已经在我国4G网络中作为重要方案被广泛采用.     

Radio-frequency hazards in the VLF to MF band

The body currents induced in a human in conductive contact with various ungrounded metallic objects like cars, trucks, fences, etc., are calculated for the frequency band 10 kHz to 10 MHz. The calculated incident E-fields required to produce thershold perception and let-go currents indicate that the recently proposed ANSI guideline of 100 mW/cm²(∼615 V/m) in the frequency band 0.3 to 3.0 MHz may result in a potential for RF burns.     

Radio-frequency and microwave dielectric properties of insects.

Basic principles and definitions of dielectric properties of materials are presented. Data from the literature on the dielectric properties of insects are briefly reviewed and discussed in relation to insect control by selective dielectric heating. Because early measurements of the dielectric properties of insects were taken on bulk samples of insects (insect and air-space dielectric mixtures), a means for converting the dielectric properties, or permittivities, of bulk samples of particulate materials to those of the solid particles is described. The technique uses the Landau & Lifshitz, Looyenga dielectric mixture equation and information on the bulk densities of air-insect mixtures used for dielectric properties measurements along with the densities of the insects. Such converted data for the dielectric constants and loss factors of the insects are presented and collected for comparison with other measurements of insect tissues and permittivity determinations from more recent microwave measurements of these same parameters. Resulting data are presented for reference, and comparisons are presented and discussed briefly.     

一种对雷达探测巡航导弹能力的评估方法

根据巡航导弹航线规划特点和作战环境实际,估算了强面分布无源杂波的RCS;计算某巡航导弹各方位角的RCS值,从而得出探测强杂波中巡航导弹所需的改善因子。通过比较雷达性能指标,优选适合探测巡航导弹的雷达,为装备部署雷达网和改进雷达参数提供评估依据。     

射频电路PCB板的电磁兼容性设计

从PCB布局、PCB布线（电源线、地线、时钟线及信号线的最优化布线原则）和补铜箔等几个方面讨论了在PCB设计中如何抑制射频干扰及实现系统电磁兼容性的方法，实践证明，该方法在抑制电磁干扰方面是比较有效且非常经济的。     

基于数字地图的导弹可飞行面设计

数字地图预处理是导弹基于数字地图导航的关键技术,提出了一种考虑导弹最大飞行曲率限制的变步长数字地图预处理算法,该算法分区域采用曲率差控制平滑迭代步长,使平滑过程加快,提高迭代速度,平滑后的地形不仅能满足导弹的纵向机动能力的限制,而且能够较好地贴近原地形。最后对算法进行了仿真研究,仿真结果表明该算法可快速完成数字地图的平滑任务,能够为导弹提供理想的可飞行安全曲面。     

Fast convergent robust range estimator for surface-to-air missiles

To cope with the intermittent unavailability of ground radar measurements due to jamming, a linear robust range estimation scheme utilising seeker measurements only is devised. Aside from the conventional approaches, it directly extracts range information from Doppler mismatch and line-of-sight rate measurements. The proposed filter shows good estimation performance and fast convergence with very small computational load     

Optimization of deep-etched, single-mode GaAs-AlGaAs opticalwaveguides using controlled leakage into the substrate

This paper presents a detailed experimental and theoretical study of the properties of deep-etched GaAs-AlGaAs optical waveguides designed using a version of the spectral index method which predicts mode losses due to leakage through the lower cladding into the high index GaAs substrate. By predicting and measuring the mode losses due to this mechanism as a function of guide width, we show that waveguides formed by reactive ion etching through the core to the lower cladding layer can be both low-loss (0.2 dB/cm) and single-mode even with core thicknesses and guide widths as large as 4.8 and 5.6 μm, respectively. We demonstrate the advantages of this type of guide for making compact integrated optic devices     

Radio-frequency preionization in a supersonic transverse electrical discharge laser

Preionization produced by a radio-frequency (RF) discharge near the cathode of a transverse flow electrical-discharge laser is used to initiate spatially diffuse discharge pulses in a Mach 3 flow of CO2-N2-He gas at pressures up to 160 torr. Main discharge uniformity and laser output performance have been determined as a function of pressure and RF discharge characteristics.     

弹道导弹轨迹参数生成技术研究

在弹道导弹防御系统中,目标轨迹参数是重要的识别因素。本文基于最小能量弹道。推出弹道导弹在地心惯性坐标系中任一时刻的位置和速度,得到了弹道导弹从发射点到落点的轨迹参数,为研究弹道导弹的弹道特性分析提供了数据支持。