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Narrowband Beamforming Algorithm for Smart Antennas 智能天线窄带波束形成算法
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379907
M. Z. Shakir, T. Durrani
{"title":"Narrowband Beamforming Algorithm for Smart Antennas","authors":"M. Z. Shakir, T. Durrani","doi":"10.1109/IBCAST.2007.4379907","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379907","url":null,"abstract":"The multidisciplinary field of smart antennas has become significantly important over the past two decades. In this paper constrained least mean square (CLMS) algorithm for narrowband adaptive beamforming has been derived. This algorithm is capable of efficiently adapting according to the environment and able to maintain the chosen frequency response in the look direction always while minimizing the output power of the array. The capability of the smart antenna systems to track the user with the main lobe and interference with the nulls creates a significant impact on the current and future wireless sensor networks. This paper includes the performance evaluation of the narrowband adaptive beamforming algorithm. The adaptability of the algorithm is closely observed for uniformly spaced linear array (ULA). The results are supported by various simulations environments created in MATLAB like varying the number of antenna arrays and varying inter element spacing between the array elements.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129245653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Comparative Study of Speed Control Algorithms for UAV Applications 无人机速度控制算法的比较研究
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379911
S.S. Ahmed
{"title":"Comparative Study of Speed Control Algorithms for UAV Applications","authors":"S.S. Ahmed","doi":"10.1109/IBCAST.2007.4379911","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379911","url":null,"abstract":"This paper presents performance comparison of three speed control schemes (engine throttle control) for LAV applications. First scheme uses fixed throttle levels (three levels for cruise climb and descend) however no speed feedback was used in the control loop. Second scheme also uses fixed throttle levels however number of levels are increased and switching is performed based on speed feedback using rule based decisions making techniques. Third scheme uses modern robust speed control, designed using Hinfin loop shaping. The Hinfin controller design requires an accurate linear model, which was obtained by system identification using available nonlinear simulations. The proposed algorithms were implemented in C/C++ and tested in 6-DOF simulations. Simulation results showed that the rule based decision making scheme gave acceptable performance, however the Hinfin controller worked better in the presence of disturbances in all flight conditions e.g. cruise, climb, descend and rolling keeping speed in a small band of a fixed reference value.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121163317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Approximation of Large-Scale Algebraic Equations Using Implicit Restart Scheme 用隐式重启格式逼近大规模代数方程
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379918
R. Quraishi, N. Ahmed, L. Khan, T. Saeed
{"title":"Approximation of Large-Scale Algebraic Equations Using Implicit Restart Scheme","authors":"R. Quraishi, N. Ahmed, L. Khan, T. Saeed","doi":"10.1109/IBCAST.2007.4379918","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379918","url":null,"abstract":"The numerical solution of large scale algebraic Lyapunov and Riccati equations is a vital issue in control systems analysis and design. It is a key step in many computational methods. In this paper a numerical method for computation of low rank approximation of large scale algebraic Lyapunov and Riccati equations is presented. This approximation can be used in model order reduction and design of large scale control systems. The proposed method is based on Arnoldi Krylov subspace projection method with implicit restart scheme as an enhancement to refine the results. Simulation of a system has been shown to authenticate the proposed technique. Results show good low rank approximation of large algebraic Lyapunov and Riccati equations can be obtained with minimal computational efforts.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"04 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124727421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An On-Line Distributed System for Improved Real-time Process Performance 提高实时过程性能的在线分布式系统
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379921
Q. Ahsan
{"title":"An On-Line Distributed System for Improved Real-time Process Performance","authors":"Q. Ahsan","doi":"10.1109/IBCAST.2007.4379921","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379921","url":null,"abstract":"Various studies and industrial experiences suggest that a plant's condition can severely affect its end-product quality and economics. Knowledge of plant's current health thus becomes important for optimal control. A real-time monitoring system would check plant health continuously and controller would adopt the most suitable strategy accordingly. Minimal cost solution was attempted in this research to achieve maximum possible monitoring results. A distributed monitoring system was developed employing 8-bit microcontrollers for signal acquisition, processing, and communication on Controller Area Network bus and Internet. A novel strategy for effective communication was developed to achieve reduced traffic under peer-to-peer paradigm. The system provided results on dynamic web pages using HTTP, Telnet, and FTP servers. Machine-to-Mobile feature was added to the system so that a microcontroller may send automatic text messages (SMS) to designated mobile phones. The developed system's performance was evaluated through a range of applications.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124562883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Designing of High Efficiency Power Amplifier Based on Physical Model of SiC MESFET in TCAD 基于TCAD中SiC MESFET物理模型的高效功率放大器设计
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379905
S. Azam, C. Svensson, Q. Wahab
{"title":"Designing of High Efficiency Power Amplifier Based on Physical Model of SiC MESFET in TCAD","authors":"S. Azam, C. Svensson, Q. Wahab","doi":"10.1109/IBCAST.2007.4379905","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379905","url":null,"abstract":"The pulse input Class C power amplifier response of an enhanced version of a previously fabricated and tested SiC MESFET 11 are studied using a new technique to its physical model in TCAD. The device is simulated at 5% duty cycle pulse for Gain (dB), Power density (W/mm), power loss and power added efficiency (PAE %) at 500 MHz and 1 GHz. The results are then correlated to the device features in DC and RF I-V characteristics. A maximum PAE of 80% at 500 MHz with 36.9 dB power gain and power density of 1.07 W/mm is achieved.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"45 19","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132974059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Analysis of Guidance Laws for Manouvering and Non-Manouvering Targets 机动目标与非机动目标制导规律分析
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379915
M. Ilyas, A. Razzaq, S.S. Hussain
{"title":"Analysis of Guidance Laws for Manouvering and Non-Manouvering Targets","authors":"M. Ilyas, A. Razzaq, S.S. Hussain","doi":"10.1109/IBCAST.2007.4379915","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379915","url":null,"abstract":"Selection of guidance law is an important factor that affects the tactical performance of surface to air missiles. In order to select a suitable guidance law, a method of comparing the normal available acceleration with demanded or required acceleration is formulated. Two guidance laws i.e., proportional navigation guidance law (PNC) and augmented proportional navigation guidance law (APNC) are tested by this method. These guidance laws are studied by the comparison of normal available acceleration and demanded acceleration. In order to simulate the missile-target engagements for maneuvering and non maneuvering targets, a mathematical model is formed and then it is simulated in SIMULINK/MATLAB to carry out extensive simulations to analyze the PNG and APNG against maneuvering and non maneuvering targets. By observing the simulation results, it can be seen that PNG is suitable for non-maneuvering targets and it is incapable for maneuvering targets. However, the APNG is an optimal guidance law for maneuvering and non-maneuvering targets both.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133761893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
S-Band MESFET Linear High Power Amplifier for OFDM Applications 用于OFDM的s波段MESFET线性高功率放大器
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379899
M. I. Nawaz, Z. Y. Malik, G. Mehdi, J. Kayani
{"title":"S-Band MESFET Linear High Power Amplifier for OFDM Applications","authors":"M. I. Nawaz, Z. Y. Malik, G. Mehdi, J. Kayani","doi":"10.1109/IBCAST.2007.4379899","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379899","url":null,"abstract":"One of the critical blocks in OFDM based transmitter is its power amplifier and the design is aimed for high linearity with maximum power efficiency. This paper describes the design and fabrication of S-band solid state high power amplifier using GaAs power MESFET device for OFDM transmitters. The amplifier operates at center frequency of 2.3 GHz with a bandwidth of 200 MHz. The typical output power is 40 dBm (10 Watt) with 12.5 dB gain. O1P3 of 52.5 dBm indicates the high linearity of this amplifier with power efficiency of 38 percent. The design is simulated using ADS 2002 C and results are measured using Agilent E4407B ESA-E Series Spectrum Analyzer, Agilent E8363B PNA and, HP E8257D RF signal generators.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116817179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Design and Implementation of an X-Band Frequency Synthesizer for Radar Applications 雷达用x波段频率合成器的设计与实现
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379898
Z. Y. Malik, M. Yasin, J. Kayani
{"title":"Design and Implementation of an X-Band Frequency Synthesizer for Radar Applications","authors":"Z. Y. Malik, M. Yasin, J. Kayani","doi":"10.1109/IBCAST.2007.4379898","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379898","url":null,"abstract":"This paper describes the design, development and testing of an X-band frequency synthesizer. The synthesizer consists of a voltage-controlled oscillator (VCO), a phase-locked loop (PLL) circuit and a reference oscillator. Commercially available components used in the design provide a low cost and short time to market solution. Typical output power of the synthesizer is +10 dBm. Loop filter is designed for a low phase margin of 48deg. Spur levels are below -9.6 dBc. The complete circuit is realized using an X-band VCO, a frequency divider (+8), a digital frequency synthesizer chip (DPLL), a loop filter and a microcontroller. The design is very immune to environmental changes especially temperature variations and is tested up to 100degC.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"37 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114311011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Fuzzy Expert System for Defect Classification for Non-Destructive Evaluation of Petroleum Pipes 石油管道无损评价缺陷分类模糊专家系统
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379912
U. Qidwai, M. Maqbool
{"title":"Fuzzy Expert System for Defect Classification for Non-Destructive Evaluation of Petroleum Pipes","authors":"U. Qidwai, M. Maqbool","doi":"10.1109/IBCAST.2007.4379912","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379912","url":null,"abstract":"In this paper, an expert system has been outlined to classify the defects in metallic petroleum pipelines using acoustic techniques with non-destructive evaluation (NDE) protocols, the proposed system maps the quantitative defect data through a novel perception-based kernel that has its roots in multidimensional fuzzy set theory to map the relative weights given to various features; mathematical or statistical, to the decision surface to deduce the type of the defect. The system has a centralized database which holds the defect information in the form of known and calculated features. The known features and their quantitative representations are used to initialize the database. Then experiments are conducted on known defects and the collected experimental data is then modeled into autoregressive process models using state of the art ltinfin deconvolution algorithm. With each feature set, a classifier tag is associated that assigns a class number to that defect. The classifier tag is then used to classify any new data using the fuzzy classifier.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132485952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Control of Robot Arm PA-10 using Camera Vision PA-10机械臂的相机视觉控制
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379916
Muhammad Umer Khan, Naeem Iqbal
{"title":"Control of Robot Arm PA-10 using Camera Vision","authors":"Muhammad Umer Khan, Naeem Iqbal","doi":"10.1109/IBCAST.2007.4379916","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379916","url":null,"abstract":"This paper proposes and investigates an automated robot-based system for the insertion of self-tapping screws into some holes. The system consists of three main components: a) a manipulator-guided screwdriver, b) a camera, and c) a system which controls and monitors the overall process. As approximately a quarter of assembly operations in the manufacture of commercial products are screw insertions, automation in this area is highly desirable. The focus of this paper is on the key stages of the insertion procedure: a) detection of the insertion location by means of a Camera, b) positioning of the electrical screwdriver employing a model-based controller, and c) appropriately monitored insertion of a screw. Research of the events occurring during the insertion of self-tapping screws has been largely neglected and automated systems presently available do not provide adequate and reliable insertions. The control scheme is applied to a seven degree-of-freedom industrial manipulator. The result show that the proposed controller i.e. Computed torque leads to improved tracking performance over a conventional PI) controller. The advantageous point of the controller is that in spite of the disturbances; the controller would be able to regulate the arm about the set-point solution.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123686723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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