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2015 International Conference on Microwave, Optical and Communication Engineering (ICMOCE)最新文献

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Design and fabrication of a microstrip printed T monopole antenna for ISM application 用于ISM的微带印刷T单极天线的设计与制造
Prasanna G. Paga, H. C. Nagaraj, T. Rukmini, N. Nithin
A T-shaped Printed monopole antenna with low profile and fed by 50Q inset feed techniques on FR4 substrate is proposed which finds application in Wireless Local Area Network (WLAN). This project work aims in designing a compact uni-planar Antenna with high gain for Wireless applications using inset feed technique. This frequency 2.4GHz (2.256-2.687 GHz) shows that antenna is suitable for WLAN application. This simulation results obtained are acceptable for ISM (Industrial, Scientific, Medical radio) band applications and it finds immediate application for studsat (student satellite). The results are obtained by simulating the antenna structure using simulation tool Ansoft HFSSTM and measurements were carried out using Vector Network Analyzer. The results show that there is a 0.2 GHz shift in the measured resonant frequency with considerable improvement in the Gain and vswr.
提出了一种在FR4基板上采用50Q插入馈电技术的低轮廓t型印刷单极子天线,用于无线局域网(WLAN)。本计画的目的是设计一种紧凑的、高增益的单平面天线,用于无线应用。该频率为2.4GHz (2.256 ~ 2.687 GHz),适合无线局域网应用。所获得的仿真结果可用于ISM(工业、科学、医疗无线电)波段应用,并可立即应用于学生卫星。利用仿真工具Ansoft HFSSTM对天线结构进行了仿真,并利用矢量网络分析仪进行了测量。结果表明,测量到的谐振频率有0.2 GHz的偏移,增益和驻波比都有明显改善。
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引用次数: 10
Effect of ray divergence factor in high frequency analysis of concave scatterers 凹形散射体高频分析中射线发散因子的影响
N. Reddy, C. Bhavana, B. Choudhury
High frequency ray based methods are best suitable methods for electromagnetic analysis of electrically large concavities those includes aircraft cabin EM analysis, conformal array analysis, radar cross section analysis of ducts etc. The ray divergence factor has a great impact in EM analysis of electrically large structures as the ray diverges each time it reflects through a curved surface. The mathematical formulation of ray divergence factor for curved surfaces and their overall effect on EM analysis has been presented here.
基于高频射线的方法是电大凹坑电磁分析最适合的方法,包括机舱电磁分析、共形阵分析、管道雷达截面分析等。射线发散因子对电大型结构的电磁分析有很大的影响,因为每次通过曲面反射时,射线都会发散。本文给出了曲面射线发散因子的数学表达式及其对电磁分析的总体影响。
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引用次数: 0
Advanced signal processing techniques for atmospheric applications using EMD 大气应用的先进信号处理技术
P. Krishna Murthy, S. Narayana Reddy
The main objective of the Lower Atmospheric Wind Profiler (LAWP) is used to provide continuous high resolution wind measurements in all weather conditions. Signal processing of this atmospheric radar is necessary to measure the height profile of wind vector by detecting the Doppler shift of echoes and signal to noise ratio (SNR). The L-band wind profiler is used for conducting research in the lower atmosphere. These radars achieve better range resolution with maximum average power (height coverage). The signals, which are processed in the present work has been obtained from the LAWP at National Atmospheric Research Laboratory (NARL), Gadanki, India. SNR computation is an important parameter in signal processing. This paper discusses improvement of SNR using Empirical Mode Decomposition (EMD) for LAWP signals. SNR for this data is computed de-noised signals and EMD de-noised signals are compared with the Wavelets de-noised signals. Results shows that there is an improvement in SNR after de-noising using EMD technique for LAWP signals.
低层大气风廓线仪(LAWP)的主要目标是在所有天气条件下提供连续的高分辨率风测量。该大气雷达需要进行信号处理,通过探测回波的多普勒频移和信噪比来测量风矢量的高度廓线。l波段风廓线仪用于在低层大气中进行研究。这些雷达以最大平均功率(高度覆盖)实现更好的距离分辨率。在本工作中处理的信号是从印度Gadanki国家大气研究实验室(NARL)的LAWP获得的。信噪比计算是信号处理中的一个重要参数。本文讨论了利用经验模态分解(EMD)提高LAWP信号信噪比的方法。计算该数据的去噪信号的信噪比,并将EMD去噪信号与小波去噪信号比较。结果表明,采用EMD技术对LAWP信号进行降噪后,信噪比有所提高。
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引用次数: 0
Beam dynamics study of a 100 MeV RF electron linac 100 MeV射频电子直线加速器束流动力学研究
R. Dash, B. Nayak, Archana Sharma, K. C. Mittal
Linac based pulsed electron beams of energy 30-100 MeV and several kilowatts are used to generate neutrons by photo-nuclear and photo-fission reaction mechanisms for neutron beam irradiation application areas like material science studies and measurement of neutron cross-section, scattering cross-section, capture cross section, fission cross section. Considerable high beam power obviously demands minimizing the high-energy particles loss during their acceleration and transport. This paper presents the simulation results for a 100 MeV and 100 kW linac using the beam dynamics codes ASTRA and ELEGANT for delivery of a high quality beam.
基于直线加速器的能量为30-100 MeV、数千瓦的脉冲电子束通过光核和光裂变反应机制产生中子,用于中子束辐照应用领域,如材料科学研究和中子截面、散射截面、俘获截面、裂变截面的测量。相当大的光束功率显然要求最大限度地减少高能粒子在加速和传输过程中的损失。本文介绍了利用光束动力学代码ASTRA和ELEGANT对100 MeV和100 kW的直线加速器进行高质量光束输出的仿真结果。
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引用次数: 0
A robust technique for contrast enhancement using Quaternionic Wavelet Transform with natural brightness 基于自然亮度的四元子小波变换的鲁棒对比度增强技术
V. Vijayakumar, Eldho Paul, A. Shafeek
In this paper we propose a new methodology for contrast enhancement (CE) and edge preservation of an image using Quaternionic Wavelet Transform (QWT) and Singular Value Decomposition (SVD). Although there are many techniques like Global histogram equalization (GHE), Local histogram equalization (LHE) and other singular value based enhancement techniques, these methods are not robust as it fails to enhance very poor contrast images. By using Quaternionic Wavelet Transform the quality of the image is better enhanced compared to other wavelet transforms. QWT provides very good shift invariance and directionality than DWT. In addition to that the proposed technique maintains the brightness of the image and preserves the edges of the image with relatively fewer artifacts.
本文提出了一种利用四元数小波变换(QWT)和奇异值分解(SVD)对图像进行对比度增强和边缘保持的新方法。虽然有许多技术,如全局直方图均衡化(GHE)、局部直方图均衡化(LHE)和其他基于奇异值的增强技术,但这些方法由于不能增强对比度非常差的图像而不具有鲁棒性。与其他小波变换相比,四元数小波变换能更好地增强图像的质量。QWT比DWT提供了很好的移位不变性和方向性。此外,所提出的技术保持了图像的亮度,并以相对较少的伪影保留了图像的边缘。
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引用次数: 0
Optical beam engineering for nanoscale structuring of transparent materials 透明材料纳米结构的光束工程
M. Bhuyan, J. Colombier, R. Stoian
This Beam engineering solutions are provided to enhance the light-matter interaction processes for extreme scale material structuring applications. We present experimental results demonstrating the potential use of spatially shaped laser pulses (Bessel pulses in particular) for high aspect ratio material structuring applications. We also provide simulation results on nonlinear beam propagation in glass, which show that in addition to the spatial shaping, temporal shaping of a laser pulse can significantly increase the effectiveness of the light-matter interaction processes.
这种光束工程解决方案提供了增强光-物质相互作用过程的极端尺度材料结构应用。我们提出的实验结果证明了空间形状激光脉冲(特别是贝塞尔脉冲)在高纵横比材料结构应用中的潜在用途。我们还提供了非线性光束在玻璃中传播的模拟结果,表明激光脉冲的时间整形除了空间整形外,还可以显着提高光-物质相互作用过程的有效性。
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引用次数: 0
Embedded system for mine process monitoring in a network constrained environment using wireless communication bridge 基于无线通信桥的网络约束环境下矿山过程监控嵌入式系统
H. Pradhan, Sampad B. Mohanty, Santosh Madhukar Yerme, P. Kale, D. P. Acharya
An efficient and robust implementation of a vehicle monitoring system in places where a Global Navigation Satellite System or GNSS (e.g. GPS, GLONASS, GALILEO) signal is available but Cellular Network Signal is unavailable/unreliable for making a GPRS connection like in an open cast mine is presented. A ZigBee Wireless Network is deployed at the location of interest, i.e. the open cast mine, with the ZigBee Network Coordinator attached to a Single Board Computer (SBC) which is placed at a remote place where it has uninterrupted Internet access either via LAN, Wi-Fi or Cellular Network (GPRS). The location of SBC is chosen such that the region devoid of cellular network falls within the ZigBee Coordinator's range. Other ZigBee nodes are attached to the vehicle's Tracking Equipment as ZigBee Routers. Whenever a vehicle's tracking equipment fails to make a GPRS connection, it sends its location via the ZigBee network to the coordinator which acts as a gateway and uploads the received location data to the tracking server. ZigBee Network Watchdog Timer are configured such as to allow automatic rejoining of ZigBee nodes when vehicles leave and enter the ZigBee Network Range. Vehicle tracking equipment and the Gateway Coordinating Equipment are implemented using hardware and open source software platforms and libraries such as Arduino, Raspberry-Pi and Linux.
在全球导航卫星系统或GNSS(例如GPS, GLONASS, GALILEO)信号可用但蜂窝网络信号不可用/不可靠的地方(例如在露天矿山中进行GPRS连接),提出了一种高效且稳健的车辆监控系统实现方法。ZigBee无线网络部署在感兴趣的位置,即露天矿山,ZigBee网络协调器连接到单板计算机(SBC),该计算机放置在远程位置,通过LAN, Wi-Fi或蜂窝网络(GPRS)可以不间断地访问互联网。选择SBC的位置,使没有蜂窝网络的区域落在ZigBee协调器的范围内。其他ZigBee节点作为ZigBee路由器连接到车辆的跟踪设备上。每当车辆的跟踪设备无法建立GPRS连接时,它就会通过ZigBee网络将其位置发送给充当网关的协调器,并将接收到的位置数据上传到跟踪服务器。ZigBee网络看门狗定时器配置为允许车辆离开和进入ZigBee网络范围时自动重新加入ZigBee节点。车辆跟踪设备和网关协调设备使用硬件和开源软件平台和库(如Arduino, Raspberry-Pi和Linux)实现。
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引用次数: 0
Spatial modeling of SPAD values for different type of crops using LISS-IV satellite imagery 基于LISS-IV卫星影像的不同作物SPAD值空间建模
D. Gupta, R. Prasad, Pradeep Kumar, V. Mishra, A. K. Vishwakarma, R. S. Singh, V. Srivastava
The aim of present study is to assess the feasibility of Linear Imaging Self Scanning (LISS-IV) sensor data for the spatial modeling of SPAD (Soil-Plant Analysis Development) values to monitor the spatial distribution of chlorophyll contents in the agricultural areas. Six crop fields and ten different GPS locations in each crop field were selected for the measurement of SPAD values. The DN (digital number) values of each pixel of LISS-IV satellite image were converted into their top of atmospheric (TOA) reflectance values. The measurement of SPAD values were carried out at the same time of satellite passes over the study area. Two band algorithms was developed using cubic polynomial regression analysis between spectral coefficients and SPAD values. The performance of the two band algorithm was evaluated by using statistical performance indices like %Bias, root mean squared error (RMSE) and Nash-Sutcliffe efficiency (NSE). The values of %Bias, RMSE and NSE were found -0.04, 3.99 and 0.95 respectively.
本研究的目的是评估线性成像自扫描(LISS-IV)传感器数据用于SPAD(土壤-植物分析发展)值空间建模以监测农区叶绿素含量空间分布的可行性。选取6块作物田和每个作物田10个不同的GPS位置测量SPAD值。将LISS-IV卫星影像各像元的DN (digital number)值转换为其大气顶反射率(TOA)值。SPAD值的测量是在卫星经过研究区域的同时进行的。利用光谱系数与SPAD值之间的三次多项式回归分析,提出了两种波段算法。采用%Bias、均方根误差(RMSE)和Nash-Sutcliffe效率(NSE)等统计性能指标评价两波段算法的性能。%Bias、RMSE和NSE分别为-0.04、3.99和0.95。
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引用次数: 1
Realization of circular polarized microstrip antenna with Arc-slot fractal geometry 圆弧槽分形几何圆极化微带天线的实现
P. Prajapati, M. Srinivasulu, M. V. Kartikeyan
Arc slot fractal boundary microstrip antenna is proposed in this paper. A technique for realization of circular polarization with integration of Arc slot fractal boundary at peripheral of circular patch is presented. In the simulation, 10 dB return loss bandwidth of 38 MHz (1.68-1.718 GHz) and axial ratio bandwidth of 7.9 MHz (1.696-1.7039 GHz) obtained. Laboratory prototype has been fabricated and return loss bandwidth, axial ratio bandwidth, radiation pattern, etc were measured. The simulation and measured results are nearly match with each other.
本文提出了一种弧槽分形边界微带天线。提出了一种圆片外围圆弧槽分形边界积分实现圆偏振的方法。仿真得到10db回波损耗带宽为38 MHz (1.68 ~ 1.718 GHz),轴比带宽为7.9 MHz (1.696 ~ 1.7039 GHz)。制作了实验室样机,测量了回波损耗带宽、轴比带宽、辐射方向图等参数。仿真结果与实测结果基本吻合。
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引用次数: 5
Dynamic profile based paging in mobile communication 移动通信中基于动态配置文件的分页
S. Parija, N. P. Nath, P. K. Sahu, S. S. Singh
In cellular network finding a mobile terminal effectively is a vital component and it has a strong impact on signaling load. Location management has a set of techniques such as location update and paging implemented to reduce this mobility based signaling traffic. Paging and location update techniques work together with to decide in searching of the user on the arrival of a call. Here a profile based paging algorithm is proposed in terms of paging success rate and bandwidth conservation comparing with various other paging algorithms. This work is validated by taking a novel data to profile the users and simulated the algorithm with actual user data. In this work the proposed algorithm gives improved better paging success rate of 3% to 9% and saves bandwidth of 60% to 20% compared to conventional paging and sequential paging respectively.
在蜂窝网络中,有效地找到移动终端是一个至关重要的组成部分,它对信令负荷有很大的影响。位置管理有一组技术,如位置更新和分页,以减少这种基于移动性的信令流量。寻呼和位置更新技术共同决定在呼叫到达时对用户进行搜索。本文从分页成功率和带宽节约两方面对基于配置文件的分页算法进行了比较。通过采用新的数据对用户进行分析,并使用实际用户数据模拟算法,验证了该工作。与传统分页和顺序分页相比,该算法的分页成功率提高了3% ~ 9%,带宽节省了60% ~ 20%。
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引用次数: 10
期刊
2015 International Conference on Microwave, Optical and Communication Engineering (ICMOCE)
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