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

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Design and implementation of FPGA based Digital Pulse Compression via fast convolution using FFT-OS method 基于FPGA的FFT-OS快速卷积数字脉冲压缩的设计与实现
Vikram Thakur, A. Verma, P. Jena, G. Prasad
Digital Pulse Compression (DPC) is one of the key steps in the signal processing of a radar system. It provides range resolution of the radar system as well as Signal to Noise Ratio (SNR) improvement of the received signal. To get higher SNR improvement by DPC, higher number of phase coded samples in the transmit pulse are required. Traditionally, it is implemented by Finite Impulse Response (FIR) filtering method. This leads to large number of taps (multipliers) of FIR filter, thus limiting the number of samples in the transmit pulse. With the advancement of technology, hardware implementation of higher number of FFT point operation is possible and hence fast convolution is preferred solution for DPC implementation. But, for high unambiguous range radars, large number of samples in the receive window leads to larger numbers of Fast Fourier Transform (FFT) points, thus, consumeing a huge portion of FPGA resources. This paper presents the approach of implementing Digital Pulse Compression via Fast Convolution using FFT - Overlap Save method (FFT-OS). This method will allow us to increase the number of samples in the receive window as well as reduce the length of FFT points to perform fast convolution.
数字脉冲压缩(DPC)是雷达系统信号处理的关键步骤之一。它提供了雷达系统的距离分辨率以及接收信号的信噪比(SNR)改善。为了提高DPC的信噪比,对发射脉冲的相位编码采样数有更高的要求。传统上采用有限脉冲响应(FIR)滤波方法实现。这导致大量的抽头(乘法器)的FIR滤波器,从而限制了采样在发射脉冲的数量。随着技术的进步,硬件实现更高数量的FFT点运算是可能的,因此快速卷积是DPC实现的首选解决方案。但是,对于高无二义距离雷达,接收窗口中的大量采样导致快速傅里叶变换(FFT)点的数量较多,从而消耗了很大一部分FPGA资源。本文提出了一种利用FFT-重叠保存方法(FFT- os)通过快速卷积实现数字脉冲压缩的方法。这种方法将允许我们增加接收窗口中的样本数量以及减少FFT点的长度以执行快速卷积。
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引用次数: 3
Genetic algorithm based selective neural network ensemble method to analyse rectangular microstrip antenna 基于遗传算法的选择性神经网络集成方法分析矩形微带天线
Navreet Saini, B. S. Dhaliwal, Simranjit Kaur Josan
Harmony in variety i.e. unity without similarity is a concept inspired from ancient times. Thinkers propose a team approach based on the same concept for problem solving i.e. using a combined group of solvers to resolve a difficult problem. Neural network ensemble (NNE) is a concept based on the same approach. Multiple artificial neural networks (ANNs) are trained for the same dataset to give the appropriate measured resonant frequency from the relative parameters of rectangular microstrip antenna (MSA). The previous experimental works' MSA datasets have been used for training of ANNs. Genetic Algorithm (GA) is employed to compute the optimum subset of ANNs which perform better than rest available to constitute an ensemble. A model of resonant frequency of MSA is established by using this NNE approach and the results have been compared with some previous works.
“和而不同”即“统一而不相似”是一个源自古代的概念。思考者提出了一种基于相同概念的解决问题的团队方法,即使用一组解决者来解决难题。神经网络集成(NNE)是基于相同方法的概念。针对同一数据集训练多个人工神经网络,根据矩形微带天线(MSA)的相关参数给出相应的测量谐振频率。以前的实验作品的MSA数据集已用于人工神经网络的训练。采用遗传算法(GA)计算性能优于其他可用人工神经网络的最优子集,从而构成一个集成。利用该方法建立了MSA的谐振频率模型,并与前人的研究结果进行了比较。
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引用次数: 3
Associative study of NDVI and precipitation in Indian region during monsoon season using satellite and ground measurements [2000–2013] 基于卫星和地面测量的季风季节印度地区NDVI与降水的关联研究[2000-2013]
Manu Mehta, S. Dubey
Natural vegetation cover and crop yield vary spatially and temporally in a diverse manner. Understanding this variation requires a robust analysis of important climatic factors such as rainfall, temperature, sunshine hours etc., along with LULC dynamics. In this study, NDVI has been used as an indicator of vegetative greenness and productivity. Based on 0.5°×0.5° spatial resolution data of NDVI obtained from MISR, correlation between NDVI and average seasonal precipitation has been analyzed. The precipitation data used is obtained from two sources, TRMM 3B42-V7 and IMD gridded data, both at spatial resolution of 0.25°×0.25°. The TRMM and IMD data have also been mutually correlated. Data was acquired for the months of June, July, August and September (JJAS) i.e. monsoon season for 14 years, 2000 to 2013. The correlation coefficients thus obtained are reported significant at a confidence level of 99% (p<;0.001).
自然植被覆盖和作物产量在时空上的变化是多样的。理解这种变化需要对重要的气候因素进行强有力的分析,如降雨、温度、日照时数等,以及LULC动态。在本研究中,NDVI被用作植被绿度和生产力的指标。利用MISR获得的0.5°×0.5°空间分辨率NDVI数据,分析了NDVI与季节平均降水的相关性。使用的降水数据来自两个来源,TRMM 3B42-V7和IMD网格数据,空间分辨率均为0.25°×0.25°。TRMM和IMD数据也相互相关。数据采集了2000年至2013年14年的6月、7月、8月和9月(JJAS),即季风季节。由此获得的相关系数在99%的置信水平上具有显著性(p< 0.001)。
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引用次数: 2
Performance analysis of ECG data compression using wavelet based hybrid transform method 基于小波混合变换的心电数据压缩性能分析
C. Jha, M. Kolekar
Efficient compression and transmission of electrocardiogram (ECG) data is a prime concern to monitor a heart patient's health from rural areas. Research has been carried out for this from last several decades to present. There are many algorithms which have been developed for this and it plays a vital role for telemedicine applications. This paper presents a compression performance analysis based on hybrid transform methods which provide higher compression ratio than single stage transform method. To implement hybrid transform method, combinations of two transforms have been used. Fast Fourier transform, discrete sine transform and discrete cosine transform have been used at transform 1 stage whereas discrete wavelet transform has been used at transform2 stage.
有效地压缩和传输心电图(ECG)数据是监测农村地区心脏病患者健康的首要问题。从过去的几十年到现在,人们对此进行了研究。为此已经开发了许多算法,它在远程医疗应用中起着至关重要的作用。本文提出了一种基于混合变换方法的压缩性能分析方法,该方法比单级变换方法具有更高的压缩比。为了实现混合变换方法,采用了两种变换的组合。快速傅里叶变换,离散正弦变换和离散余弦变换在变换1阶段被使用,而离散小波变换在变换2阶段被使用。
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引用次数: 7
Design of microstrip wideband bandpass filter using U shaped defected ground structure 采用U形缺陷接地结构的微带宽带带通滤波器设计
K. Avinash, I. S. Rao
This paper proposes a microstrip wideband bandpass filter using `U' shaped defected ground structure (DGS). It consists of four coupled U shaped slots etched on the ground plane and is fed by parallel coupled `T' shaped microstrip feed lines on the top. The gap between T shaped feed lines act as an inverter which will convert bandstop response to bandpass response. Due to the arrangement of etched slots and due to cross coupling between these slots, the Alter exhibits two transmission zeros on either side of the passband, thereby improving selectivity of the filter on both sides of the passband. Prototype filter simulated shows an insertion loss of 1.15 dB with fractional bandwidth (FBW) of 29.73% centered at 5.75 GHz. The designed filter has the benefits of low insertion loss, high selectivity, low cost and is easy to fabricate, which can be used for modern wireless communication systems.
提出了一种利用“U”形缺陷接地结构(DGS)的微带宽带带通滤波器。它由四个耦合的U形槽蚀刻在接平面上,并由顶部平行耦合的“T”形微带馈电线馈电。T形馈线之间的间隙充当逆变器,将带阻响应转换为带通响应。由于蚀刻槽的排列以及这些槽之间的交叉耦合,Alter在通带的两侧显示两个传输零,从而提高了滤波器在通带两侧的选择性。仿真的原型滤波器显示插入损耗为1.15 dB,以5.75 GHz为中心的分数带宽(FBW)为29.73%。所设计的滤波器具有插入损耗低、选择性高、成本低、易于制作等优点,可用于现代无线通信系统。
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引用次数: 7
Design of a dual port integrated antenna for cognitive radio applications 用于认知无线电应用的双端口集成天线设计
Eranki Venkata Shashank, Biswajit Dwivedy, S. Behera
This paper presents an Ultra-Wideband (UWB) fractal antenna and a dual-band antenna integrated on a single substrate for cognitive radio applications. The UWB fractal antenna has an impedance bandwidth of 112.05%. The dual-band antenna has a bandwidth of 2.17% (3.503 GHz-3.58 GHz), suitable for WiMAX applications, and 2.32% (5.96 GHz-6.1 GHz) with resonant frequencies at 3.525 GHz and 6.02 GHz respectively. The dual-band antenna has a gain of 0.86dB and 2.27dB at frequencies of 3.525 GHz and 6.02 GHz respectively. Shorting pins are used in the antenna to reduce surface wave and to increase isolation between the two antennas. The isolation between the two antennas is found to be below -25 dB at 3.525 GHz and 6.02 GHz. The antenna has a compact dimension of 70mm × 50mm (1.16λ × 0.83λ). The observed VSWR value of the UWB antenna and the dual-band antenna is less than 2 for the required frequency range.
本文提出了一种用于认知无线电应用的超宽带(UWB)分形天线和一种集成在单一基板上的双频天线。超宽带分形天线的阻抗带宽为112.05%。该双频天线带宽为2.17% (3.503 GHz-3.58 GHz),适用于WiMAX应用;带宽为2.32% (5.96 GHz-6.1 GHz),谐振频率分别为3.525 GHz和6.02 GHz。双频天线在3.525 GHz和6.02 GHz频率下的增益分别为0.86dB和2.27dB。在天线中使用短引脚来减少表面波并增加两个天线之间的隔离。在3.525 GHz和6.02 GHz时,两根天线之间的隔离度低于-25 dB。天线尺寸紧凑,为70mm × 50mm (1.16λ × 0.83λ)。在要求的频率范围内,UWB天线和双频天线的实测VSWR值小于2。
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引用次数: 1
Broadband circularly polarized antenna array for S-band wireless applications s波段无线应用的宽带圆极化天线阵列
U. V. Gaikwad, P. N. Shinde
A design of 2×2 broadband circularly polarized (CP) antenna array is proposed to resonate within S-band at 2.4 GHz for wireless applications. To realize broadband operation, multiple slots of variable length are embedded in antenna array patch geometry. The individual array patch is excited by microstrip feed lines, which are derived from power divider circuits. The whole feeding structure is designed with sequential phase (SP) of 00, 90, 180 and 2700. The proposed multi-slot array structure gives the advantage of being wide impedance and axial ratio bandwidth with high gain. The -10 dB reflection coefficient bandwidth and 3 dB axial ratio (AR) bandwidth are 86% (1.68 GHz-4.22 GHz) and 29% (2.99 GHz-4.02GHz), respectively. Good radiation characteristics with gain more than 10 dBi in the operating region are obtained.
提出了一种用于无线应用的2×2宽带圆极化(CP)天线阵列的设计,该天线阵列在2.4 GHz的s波段内谐振。为了实现宽带操作,在天线阵贴片几何结构中嵌入多个可变长度的插槽。单个阵列贴片由功率分配器电路产生的微带馈线激发。整个进给结构采用序相(SP) 00、90、180、2700设计。所提出的多槽阵列结构具有宽阻抗和高增益的轴比带宽等优点。- 10db反射系数带宽为86% (1.68 GHz-4.22 GHz), 3db轴比带宽为29% (2.99 GHz-4.02GHz)。在工作区域获得了增益大于10dbi的良好辐射特性。
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引用次数: 1
In-flight MTF measurement for ResourceSat-2 LISS-III sensor ResourceSat-2 LISS-III传感器的飞行MTF测量
N. Raghavender, B. S. Sree, C. Rao, A. Kumar, B. Krishna
In-flight sensor Modulation Transfer Function (MTF) can be measured using ground based targets (natural/artificial) which satisfy the basic criteria. Meeting the specific conditions all the time is practically difficult. In this paper, we have explored Bi-resolution method to measure ResourceSat (RS)-2 Linear Imaging Self Scanner (LISS)-III sensor MTF. LISS-III sensor MTF was measured for three spectral bands (B2, B3 & B4) with corresponding LISS-IV bands as reference. MTF values determined for all three data sets found to meet the specifications and their variation were within 6.1% over the mean.
机载传感器调制传递函数(MTF)可以利用满足基本准则的地面目标(自然/人工)进行测量。一直满足特定条件实际上是困难的。在本文中,我们探索了双分辨率方法来测量ResourceSat (RS)-2线性成像自我扫描器(LISS)-III传感器MTF。以相应的LISS-IV波段为参考,测量LISS-III传感器在B2、B3和B4三个光谱波段的MTF。所有三个数据集确定的MTF值符合规范,其变化在平均值的6.1%以内。
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引用次数: 0
Design of a finite attenuation pole miniaturized S-band lowpass filter using elliptic function 基于椭圆函数的有限衰减极点小型化s带低通滤波器设计
T. K. Das, S. Chatterjee
A miniaturized microstrip lowpass filter design using elliptic function is presented in this paper. The proposed filter has a cut-off frequency of 2.5 GHz with passband ripple 0.1dB and stopband insertion loss greater than 20dB at 2.85 GHz. It provides two finite attenuation poles at 2.945 GHz and 4.015 GHz in the stopband having attenuation of the order of 35dB and 50dB respectively. Different types of design characterization have been investigated of the proposed filter and a comparative study based on design parameters and dimensions has been provided.
提出了一种基于椭圆函数的小型化微带低通滤波器设计。该滤波器截止频率为2.5 GHz,通带纹波0.1dB,在2.85 GHz时阻带插入损耗大于20dB。它在阻带的2.945 GHz和4.015 GHz处提供两个有限衰减极点,衰减分别为35dB和50dB数量级。对所提出的滤波器进行了不同类型的设计表征,并提供了基于设计参数和尺寸的比较研究。
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引用次数: 1
Compensation of fiber non linear impairments using Optical Back Propagation 利用光反向传播补偿光纤非线性损伤
Umashanker Sahu, B. C. Jinaga
The paper presents analysis of Kerr nonlinear impairments present in long haul Wavelength Division Multiplexing (WDM) links and their compensation. A framework is proposed for transmission impairments compensation in optical domain by Optical Back Propagation (OBP) technique. In this technique, effective negative Kerr nonlinear coefficient is achieved using highly nonlinear fibers (HNLFs) and results depict that in nonlinear transmission regime, computational complexity is reduced by implementing OBP compared to digital back propagation (DBP).
本文分析了长程波分复用(WDM)链路中存在的克尔非线性损伤及其补偿。提出了一种基于光反向传播(OBP)技术的光域传输损伤补偿框架。在该技术中,使用高度非线性光纤(HNLFs)实现了有效的负克尔非线性系数,结果表明,在非线性传输状态下,与数字反向传播(DBP)相比,实现OBP降低了计算复杂度。
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引用次数: 0
期刊
2015 International Conference on Microwave, Optical and Communication Engineering (ICMOCE)
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