C3CM及其关键技术

C3CM是针对C3I在现代战争中的作用和地位而提出的新型战术策略，主导思想是用对抗敌C3I的措施去战胜敌人，克敌制胜，关于C3CM推荐这样的定义，C3CM是在充分的情报支持下，综合运用作战保密，军事欺骗，电子干扰和火力摧毁等手段削弱或破坏敌C3I系统的作战活动，为了在我国及早设计，研制和装备C3CM系统，勿需一切从头做起，可在现有技术成果基础上组建基本系统，以后再完善，扩充，重要的是运用系统工程原理和方法解决C3CM这种大综合系统必须着重解决的关键技术课题，如：C3CM系统方案模型，对C3I中心节点的侦察识别和定位，C3CM数据汇集情报关联分析。C3CM决策支持，C3CM通信控制技术，C3CM系统分析和作战效能评定，等等。     

基于混沌理论的防空C3I系统应用研究

为了解决防空C3I系统面临的信息安全威胁,分析其所面临的安全威胁,针对其体系结构的特点,提出了基于混沌理论的防空C3I混沌系统信息安全结构,同时介绍混沌理论的基本理论和发展状况,及其混沌电路的产生和混沌信号的特征,论述混沌技术在防空C3I系统中的应用前景,建立了基于混沌理论的防空C3I混沌系统。     

基于CPLD的I~2C总线接口设计

在电路设计中,I2C总线是比较常用的两线式串行通信方式,大多数的CPU都擅长于并口操作,不具备直接操作I2C总线接口的能力。为了使不具备I2C总线接口能力的CPU通过对并口的简单操作实现对I2C总线接口的控制,在分析I2C总线常用工作模式的基础上,设计实现工作于主机模式的,以CPLD完成I2C总线开始信号、结束信号的输出,以及并行数据到I2C总线模式串行数据转换或I2C模式串行数据到并行数据转换的I2C接口模块。采用该模块,可以使不具备I2C总线接口的CPU通过并口方便地控制I2C总线设备,简化系统程序设计。     

面向21世纪的美国海军C^4I介议计划

９０年代，美国海军正在经历一场通信革命，其代表就是综合Ｃ＾４Ｉ体系结构即Ｃ＾４Ｉ介议计划的形成和着手实现工作。Ｃ＾４Ｉ成为美国海军面向２１世纪的着眼点和提高海军作战能力的两大技术之一，这在近４５年来还是第一次，因此格外引人注目。     

美国海军卫星通信发展新举措

对于海军部队来说，作战行动必须依靠强大且可靠的卫星通信能力，为此，美国海军于近期出台了不少新措施，以进一步提高卫星通信能力。     

浅谈美国海军的通信对抗

分析了美国海军通信对抗的能力，指出了美海军通信对抗装备的现状，探讨了其通信对抗的技术特点和发展趋势。     

“米诺N4＋”火箭首飞发射军事通信试验卫星

世界协调时2011年9月27日15时49分，轨道科学公司在阿拉斯加科迪亚克航天发射场执行“米诺陶4＋”火箭首发任务，成功将美国海军研究试验富的     

复杂电磁环境下C4ISR系统的防护研究

信息化战争是以争夺战场的"制信息权"为主要行动的战争.作战双方都力图集中主要作战力量,使用各种作战手段.压制、削弱、破坏和摧毁敌人的C4I(指挥、控制、通信、计算机、情报)系统,同时有效地保护己方的C4I系统.而对C4I系统的攻击和防护成为信息战争重要作战行动,C4I系统成为主要作战目标.研究C4I的各种防护措施的目的...     

诺格公司开始研究未来电子战系统

[据诺格公司网站2009年2月23日报道]美国海军与诺格公司签定了一项合同，要求诺格公司对下一代干扰机进行研究，从而取代陈旧的ALQ-99机载电子攻击系统。美国海军正在寻求方法，对抗未来美国士兵面对的各种各样电子武器、通信和敌人防空威胁。     

面向作战任务的舰艇编队C3I系统结构优化匹配分析

利用有色Petri网(CPN)建模工具,得到了舰艇编队指挥、控制、通信及情报(C3I)系统的可行结构空间,同时结合CPN Tools得到了匹配测度模型,进而得出面向作战任务的舰艇编队C3I系统结构优化匹配模型,最后给出了实例应用,得到了某编队C3I系统的最优匹配结构.提出的方法操作简单,通用性强,为舰艇编队C3I系统结...     

Electrical properties and photoluminescence studies of Ge-implanted GaAs

Thedata presented here show that Ge- implanted GaAs has a complex amphoteric behavior which is controlled by the implantation dose, implantation temperature, and anneal temperature. Annealing was performed with rf plasma deposited Si₃N₄ as the encapsulant. Implantations at-100° C resulted in p-layers, while those performed at 100° C and above resulted in n-layers regardless of the dose and anneal temperature. Room temperature implants resulted in p- or n-layers depending on the combination of dose and anneal temperature. Electrical activation and carrier mobilities were low for anneal temperatures ≤ 850°C. Low temperature (6 K) photoluminescence indicated that a significant amount of residual damage remained after annealing. Atomic Ge distribution profiles, carrier con-centration profiles, and junction characteristics of Ge-implanted GaAs planar diodes are also presented. This work was supported by the Joint Services Electronics Program (U.S. Army, U.S. Navy, U.S. Air Force) under contract N00014-79-C-0424, and by the Office of Naval Research under contract N00014-76-C-0806.     

Review and comparative evaluation of symbolic dynamic filtering for detection of anomaly patterns

Symbolic dynamic filtering (SDF) has been recently reported in literature as a pattern recognition tool for early detection of anomalies (i.e., deviations from the nominal behavior) in complex dynamical systems. This paper presents a review of SDF and its performance evaluation relative to other classes of pattern recognition tools, such as Bayesian Filters and Artificial Neural Networks, from the perspectives of: (i) anomaly detection capability, (ii) decision making for failure mitigation and (iii) computational efficiency. The evaluation is based on analysis of time series data generated from a nonlinear active electronic system. This work has been supported in part by the U.S. Army Research Laboratory and the U.S. Army Research Office under Grant No. W911NF-07-1-0376, by the U.S. Office of Naval Research under Grant No. N00014-08-1-380, and by NASA under Cooperative Agreement No. NNX07AK49A.     

Effect of broadcast and precise ephemerides on estimates of the frequency stability of GPS Navstar clocks

Frequency stability analysis of on-orbit Navstar clocks is performed by the Naval Research Laboratory using both the broadcast and the precise post-processed ephemerides. The phase offset between the Navstar clock and the reference clock is computed from pseudorange measurements obtained by dual-frequency GPS receivers at the five GPS monitor sites and at the U.S. Naval Observatory precise-time site. The broadcast ephemerides are generated at the GPS master control station by a Kalman filter using data collected from the five GPS monitor stations. The precise post-processed ephemerides are generated by the Defense Mapping Agency (DMA) using data collected from the GPS monitor sites and from five additional DMA monitor sites. In this paper the frequency stability is estimated for two Navstar caesium clocks–a Block I caesium clock (Navstar 9) and a Block II caesium clock (Navstar 23)–using both the broadcast and the precise ephemerides. A significant improvement in the estimate of the frequency stability of the Block II clocks has been achieved using the precise ephemeris.     

Super conductors on the high seas [ship propulsion using superconductor motors]

This article describes a $78 million U.S. Navy effort which is returning ship propulsion to the absolute forefront of advanced technology. In a program with far-reaching implications - not only for future warships but also for the cargo, cruise ship, and conceivably even the electricity-generating businesses - the U.S. Office of Naval Research (ONR) is testing a 5 MW, 23 ton superconductor ship motor and is also already well into the design of a full-scale, 36.5 MW superconductor motor.     

美陆军战场应用软件发展综述

陆军装备信息化建设对战场信息系统的指挥控制、态势感知、部队跟踪等能力提出了更高的要求。从美陆军利用战场应用软件加速其装备现代化转型的发展动因出发，总结了美陆军战场应用软件的发展现状，分析了目前正在发展的典型项目及其技术难点，包括战术应用软件、任务指挥软件套件、态势感知与指控软件。在此基础上，指出软件应用是陆军战场信息系统摆脱“烟囱式”架构、保持新技术同步的一种有效发展途径。     

Annealing studies of Be-implanted GaAs0.6P0.4

Differential resistivity and Hall effect measurements and secondary ion mass spectrometry (SIMS) are used to study the annealing behavior of Be-implanted GaAs_0.6P_0.4. Results similar to that previously reported for Be-implanted GaAs are observed, including outdiffusion of Be into the Si₃N₄ encapsulant during 900‡C annealing of high dose implants. Nearly all (85–100%) of the Be remaining after a 900‡C, 1/2 hr anneal is electrically active. However, the electrical activation at low annealing temperatures (600–700‡C) is much lower in GaAs_0.6P_0.4 than in GaAs. A substantial amount of diffusion is observed even for the low fluence Be implants in GaAs_0.6P_0.4 annealed at 900‡C, indicating a greater dependence of the diffusion on defect-related effects in the ternary. This work was supported by the Joint Services Electronics Program (U.S. Army, U.S. Navy, U.S. Air Force) under Contract DAAB-07-72-C-0259, by Monsanto Company, and by the Naval Electronic Systems Command. On leave at Cornell University, Department of Electrical Engineering, Ithaca, NY 14853.     

网络空间安全视域下的美国选举安全

随着数字化与信息化程度的逐步深入,美国社会各个领域对于网络空间的依赖程度日益增加。在此背景之下,选举安全问题如今已成为美国政界及社会关注的重要安全议题,也被美国情报界列为全球威胁评估榜单的前列。通过对近年来有关美国选举安全问题的历时性追踪,深入剖析美国选举安全问题的根源、影响手段,以及美国政府为维护选举安全在技术、制度以及法律领域的具体实践。在此基础之上,归纳总结美国选举安全问题的主要特点及发展趋势。     

美国海军光电设备向沿海用型发展

冷战结束后,美海军作战重点从公海转移到沿海区域。文另简介了沿海作战的特点,主要论述了一些适于沿海作战的光电设备,包括舰用光电设备、空中沿海光电侦察设备以及激光武器的研制情况。     

Growth of underwater communication technology in the U.S. Navy

Research and development in underwater communications is expanding in the U.S. Navy. Although there is no single Navy program office whose primary aim is to develop underwater telemetry systems, the Office of Naval Research has made a significant investment in both theoretical and applied work over the past twenty years and currently funds multiple programs in acoustic communication. Increased throughput, better power efficiency, low probability of detection, and compact implementations are all important research topics.     

美军航天测控企业级地面体系的发展

美国军事航天地面测控系统采用为每种军事卫星系统配套专用测控系统的方式构建,形成"烟囱"式割裂的格局,造成资源和人力的极大浪费.空间威胁的日益严峻迫使美军进行地面系统的转型.美军提出构建"企业地面体系"(EGA),用通用的测控系统完成所有军事卫星的测控,通过云技术提高网络安全性,通过自动化和商业化减少操作人员,提高系统效率,降低运维成本,腾出更多人力完成有效载荷的部署与操控,以应对日益迫近的太空作战.虽然美军EGA的具体方案还未出台,但通过对其发展背景、总体设想、拟采用的关键技术及发展现状进行跟踪分析,总结了美军构建通用军事测控系统的总体设计思路及设计原则,对我国航天测控系统的发展提出了建议.