一种新型GPS实时定位系统的设计

针对目标飞行器定位的广泛应用,提出了一种基于单片机和CPLD硬件平台的新型GPS实时定位系统,该系统由目标发射机和GPS接收机组成。两部分实现通用化设计,均由GPS模块、中控模块、无线射频模块、电源管理模块等模块组成。系统工作时,目标发射机通过无线串口发送GPS数据,地面GPS接收机完成数据的采集与编帧并经FT245接口回传PC终端以实时监测和事后分析。测试结果表明:该系统能够实时地、精确地完成不同环境下多种飞行器的定位。     

基于GPS/GSM的无线列车调度系统研究

目前中国铁路正面临着运行速度提升与智能化管理的全面升级。根据对目前国内外高速列车的定位及智能化调度方式的研究,提出基于GPS/GSM网络的无线列车调度系统。该系统由上位机、通信控制器、GSM模块、GPS模块及智能列车构成。上位机软件通过串口向通信控制器下传命令,同时该控制器也向上位机发送通信状态及列车的运行信息,列车上的通信控制器收到GSM模块中的语言及数字命令之后再通过串口发送给列车,用于完成列车运行路线的远程控制。     

基于GPS9808的智能定位系统设计

提出了一种以OEM模块GPS9808和MSP430F169单片机为核心器件的智能定位系统的设计方案。同时介绍了GPS9808和MSP430F169的主要功能及特点,给出了由GPS9808和MSP430F169单片机、GSM短消息模块TC35i所组成的物体智能定位系统的软硬件实现方法。经过测试,该系统的性能得到验证,也取得了良好的效果。     

基于DS18B20的室内智能温度控制系统设计

对于一些特定的室内农业和工业生产,提出了一种DS18B20温度传感器和ATmage8单片机结合的智能温度控制系统。该系统主要可分为上位机系统和下位机系统,上位机设定温度范围并控制下位机。ATmage8单片机通过DS18B20采集温度信号,处理后将温度值与上位机设定阈值作比较。单片机控制加热模块的工作,并且通过串口传给上位机显示当前温度。在经过实际的测试,该系统的性能稳定,误差控制在0.5℃,满足了小面积的室内应用。     

体育运动全身反应测试仪中精确度的设计

为了解决体育运动领域的全身反应时精确度的问题,本文提出了一种更客观、精密的设计原理。该仪器利用光电感应原理,与信号处理电路相组合形成精密传感器。同时借助ATmega8L单片机,由无线通信模块将单片机记录的数据传到上位机中进行分析、归纳和计算。     

基于GPRS短信模块的远程数据控制系统

本文设计了一种基于GPRS短信模块的远程控制系统．从而达到对一些野外或异地终端进行控制。该系统由上、下位机组成,上位机又由GPRS短信模块和PC机组成．两者之间通过串口．使用AT指令进行通信。上位机用户界面采用C”Builder软件设计。下位机由GPRS短信模块、51单片机终端系统组成。上位机可以随时读取下位机的工作参数．对系统的工作状态进行控制。该方案进一步促进了工业控制系统的智能化和信息化。     

基于GPRS短信模块的远程数据控制系统

设计了一种基于GPRS短信模块的远程控制系统,借助移动通信网的GPRS网络,采用短信息模式进行通信,从而达到对一些野外或异地终端进行控制。该系统由上、下位机组成,上位机又由GPRS短信模块和PC机组成,两者之间通过串口使用AT指令进行通信。上位机用户界面采用C＋＋Builder软件设计。下位机由GPRS短信模块和51单片机终端系统组成。上位机可以随时读取下位机的工作参数,根据当前参数,用户可以对系统的工作状态进行控制。该方案进一步促进了工业控制系统的智能化和信息化。     

基于北斗／GPS定位装置的研制

针对我国正逐步推广具有自主知识产权的北斗导航定位系统这一现状,设计了一种北斗／GPS（全球定位系统）多模定位接收机。这种接收机采用STC82C51RC单片机作为数据处理部分,能将CC50-BG北斗／GPS接收模块接收到的卫星定位信息处理后显示在LCD1602液晶屏上。通过对接收数据的分析可以发现北斗的定位值比GPS精确5米左右,误差放大倍数（精度因子）比GPS大了1．5左右,并推出测量得到的卫星与接收机间距离的误差（伪距误差）比GPS小。     

基于RDSS和RNSS的北斗定位装置设计

针对飞行过程中的定位问题,设计了一款高功率、体积小的新型定位装置。该定位装置主要由北斗模块、单片机模块和供电模块三部分组成。北斗模块由RDSS和RNSS模块集成,信标工作时首先通过RNSS快速获取定位数据,定位数据经过单片机处理后通过RDSS发送至卫星,然后地面短报文接收机接收到数据,最终传输至上位机,将经度、纬度等参数详细转换并呈现至上位机界面。本设计采用双北斗模块和多接收模块保证发射频率和接收效率。经过连续的测试后,新型定位装置运行状态稳定,通信成功率≥95％,能够达到预期要求。     

基于Arduino的定位系统设计

针对市场上的定位系统使用复杂和产品质量参差不齐的问题,使用Arduino作为单片机,采用U-BLOX芯片作为GPS模块,使用SIM800作为GPRS模块,设计组成嵌入式定位系统.系统可通过高德地图API实时显示定位位置.经过测试验证,该系统操作简单便捷,定位显示准确,具有广阔的应用前景.     

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.     

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.     

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     

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.     

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.     

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