无人机数字指挥调度系统技术研究

某型无人机系统所采用的对讲体制,指挥调度能力有限、数据接口功能单一,与新形势下的军事训练发展要求不相适应.数字指挥调度系统近年来在交通管理系统和武器试验系统获得广泛应用,具有诸多优点.应用数字指挥调度系统开展无人机作战指挥训练,可以提高武器系统的网络化和信息化程度,加强作战指挥训练的质量控制.文章研究应用数字指挥调度系统开展无人机作战指挥训练的技术方案.     

无人机激光光电目标跟踪指示技术研究

无人机技术近年来发展迅速，军事应用日益广泛。传统机载激光目标指示器重量与体积较大，很难集成于无人机来实现军事应用。主要介绍了一种国际主流的激光制导武器系统技术方案及作战应用流程，并研究了一种轻小型化的三光合一的无人机激光光电目标跟踪指示载荷。有别于传统激光指示照射，该无人机激光光电载荷通过与无人机的紧耦合完成小型化集成，并实现了远近距离一体化探测功能：远距离可对打击目标进行定位引导(大地坐标位置信息)，近距离可对打击目标进行激光照射指示引导。同时，本文的指示方法利用低成本小型无人机突击作战，避免了人员暴露及伤亡风险，提高了无人化作战效率。     

基于无人机的风电智能巡检系统分析

阐述无人机故障识别路线和无人机飞行控制，包括风电巡检风险评估、风电巡检避障策略、三维激光扫描技术、风电自主巡检，探讨风电智能巡检技术应用功能。     

系留无人机通信问题研究

通信链路是系留无人机系统的重要组成部分，旨在建立一条空地双向数据传输通道，以完成地面设备对系留无人机平台的遥控、遥测和任务信息传输。文章描述系留无人机使用的工作频段，按照通信链路和应用场景对无人机通信进行分类，最后介绍遥控、遥测、定位和任务载荷信息传输四种通信类型的系留无人机的主要功能和工作流程。     

外军无人机数据链的发展现状与趋势

无人机数据链是无人机的重要组成部分,是飞行器与地面系统联系的纽带。首先按照飞行高度和重量对无人机进行了分类,在此基础上概述了外军无人机数据链的发展现状;然后介绍了几种典型无人机数据链如数字数据链(DDL)、战术通用数据链(TCDL)和Quint网络技术(QNT)数据链的发展和性能,并分析和展望了无人机数据链通用化、安全化、网络化等发展趋势;最后总结了外军无人机数据链发展的经验,希望为从事无人机和数据链研究的工程技术人员提供参考。     

无人机通讯链路系统

近年来,在军事冲突和战争领域中,侦察和攻击型无人机发挥的作用尤为显著.随着技术的发展,军用无人机除了单纯的侦察攻击、指挥、预警和电子战的作战功能逐渐发展和壮大,战术应用将沿单一作战分为一体式无人协同作战.无人计算机集群网络战的发展路径,表明了未来军用无人机的组网和通信能力将至关重要.无人机作为网络中心战的概念,是空中空间综合的重要一环,其网络化能力和网络性能将对未来作战模式产生重要影响.移动自组网(Mobile Ad Hoc Networks)是一种由移动节点组成的多跳自组织网络,具有无中心和自组织特性,特别适用于无人机群的协同作战.随着军用无人机技术的成熟和大量的设备、特设的大型网络适应于高动态拓扑结构的变化,保持良好的通信性能的能力和挑战,传统的路由协议已经很难满足要求.因此,开发新型适应人机战术的应用模式需求路由协议才能更好地提升我国军事技术力量.     

无人机自主编队飞行控制的技术问题

从未来无人机的性能需求出发，详细描述了无人机编队飞行的功能特点和核心技术。根据无人机的任务要求，将编队飞行分为作战编队、侦察编队和混合协同编队，同时研究了编队飞行控制的关键技术，并对无人机编队重构技术进行了探讨和分析。     

无人机技术在基站勘察中的应用

无人机实质上是一种自动飞行的无人驾驶的飞行器。在科技和经济飞速发展的时代,新技术和新材料的运用让无人机的发展进程和应用前景有很大的潜力。本文以无人机的功能和技术优势为出发点,对无人机在基站勘查中的应用进行探讨。     

WPF技术在无人机地面控制站中的应用

新一代Windows呈现基础(Windows Presentation Foundation,WPF)技术以其丰富的界面表现力和功能扩展能力而备受瞩目,并广泛应用于图形处理和界面设计上。针对某小型无人机,在地面控制站的设计中应用了WPF技术。分析了当前国内无人机地面站设计中的不足和WPF技术相对于传统技术的优势。针对国内无人机地面站发展的技术特点,详细探讨了WPF技术在无人机地面控制系统关键领域中的设计。在WPF的视频处理上,创新性地融入了Direct Show图像视频处理技术。通过飞行仿真系统测试以及野外试飞试验,验证了应用WPF技术所设计地面站系统满足无人机地面站的功能需求。     

一种基于多点观测的无人机目标定位方法

随着无人机技术发展,无人机应用越来越广泛,目前已被应用于侦察监视、抢险救灾和目标打击等领域。对地目标精确定位是军用无人机重要功能之一,提出了一种基于多点观测的无人机对地目标定位方法。该方法定位精度高、适用范围广,不需要搭载光电侦察平台,无需进行激光测距,有效地保证了无人机自身安全,也降低了测量设备的成本,丰富了无人机目标定位理论方法。     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

GaAsSb/InAlAs PA DHBTs Grown by Production MBE

The epi material growth of GaAsSb based DHBTs with InAlAs emitters are investigated using a 4 × 100mm multi-wafer production Riber 49 MBE reactor fully equipped with real-time in-situ sensors including an absorption band edge spectroscope and an optical-based flux monitor. The state-of-the-art hole mobilities are obtained from 100nm thick carbon-doped GaAsSb. A Sb composition variation of less than ± 0.1 atomic percent across a 4 × 100mm platen configuration has been achieved. The large area InAlAs/GaAsSb/InP DHBT device demonstrates excellent DC characteristics,such as BVCEO＞6V and a DC current gain of 45 at 1kA/cm2 for an emitter size of 50μm × 50μm. The devices have a 40nm thick GaAsSb base with p-doping of 4. 5 × 1019cm-3 . Devices with an emitter size of 4μm × 30μm have a current gain variation less than 2% across the fully processed 100mm wafer. ft and fmax are over 50GHz,with a power efficiency of 50% ,which are comparable to standard power GaAs HBT results. These results demonstrate the potential application of GaAsSb/InP DHBT for power amplifiers and the feasibility of multi-wafer MBE for mass production of GaAsSb-based HBTs.     

Propagation of hermite-cosh-gaussian beams passing through ABCD optical system with an annular aperture

By using the expansion of the aperture function into a finte sum of complex Gaussian functions, the corresponding analytical expressions of Hermite-cosh-Gaussian beams passing through annular apertured paraxially and symmetrically optical systems written in terms of ABCD matrix were derived, and they could reduce to the cases with squared aperture. In a similar way, the corresponding analytical expressions of cosh-Gaussian beams through annular apertured ABCD matrix were also given. The method could save more calculation time than that by using the diffraction integral formula directly.     

Noise character analysis and the restraint of self-pulsation laser diodes

We calculate the Langevin noise sources of self-pulsation laser diodes, analyze the effects of active region noise and saturable-absorption region noise on the power fluctuation as well as period fluctuation, and propose a novel method to restrain the noise effects. A visible SIMULINK model is established to simulate the system, The results indicate that the effects of noise in absorption region can be ignored; that with the increase of DC injecting current, the noise effects enhance power jitter, and nevertheless, the period jitter is decreased; and that with external sinusoidal current modulating the self-pulsation laser diode, the noise-induced power jitter and period jitter can be suppressed greatly. This work is valuable for clock recovery in all-optical network.     

Influence of polarization extinction ratio on distributed polarization coupling detection

Distributed polarization coupling in polarization-maintaining fibers can be detected by using a white light Michelson interferometer. This technique usually requires that only one polarization mode is excited. However, in practical measurement, the injection polarization direction could not be exactly aligned to one of the principal axes of the PMF, so the influence of the polarization extinction ratio should be considered. Based on the polarization coupling theory, the influence of the incident polarization extinction on the measurement result is evaluated and analyzed, and a method for distributed polarization coupling detection is developed when both two orthogonal eigenmodes are excited.     

High-quality single-crystal CdSe nanoribbons and their optical properties

Large-scale synthesis of single-crystal CdSe nanoribbons is achieved by a modified thermal evaporation method, in which two-step-thermal-evaporation is used to control CdSe sources＇ evaporation. The synthesized CdSe nanoribbons are usually several micrometers in width, 50 nm in thickness, and tens to several hundred micrometers in length. Studies have shown that high-quality CdSe nanoribbons with regular shapes can be obtained by this method. Room-temperature photolumines-cence indicates that the lasing emission at 710 nm has been observed under optical pumping （266 nm） at power densities of 25-153 kW/cm^2. The full width half maximum （FWHM） of the lasing mode is 0.67 nm     

Call for Papers

正Communications—VLSI Researches and industries of telecommunications have been growing rapidly in the last 20 years and will keep their high growing pace in the next decade.The involved researches and developments cover mobile communications,highway and last-mile broadband communication,domain specific communications,and emerging D2D M2M communications.Radio communication steps into its