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Aerodynamic Modelling and Real-time Control of a 1-DOF Tailplane 一自由度尾翼的气动建模与实时控制
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379920
S. Ahmad
{"title":"Aerodynamic Modelling and Real-time Control of a 1-DOF Tailplane","authors":"S. Ahmad","doi":"10.1109/IBCAST.2007.4379920","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379920","url":null,"abstract":"This paper presents aerodynamic modelling and realtime control of a 1 degree-of-freedom (DOF) free to pitch Tailplane. The system is designed to serve as an experimental test facility for investigating flight dynamics principles, model validation and different feedback control paradigms. A high fidelity plant model is an important first step in many flight related applications such as control system design, analyses and pilot training. To achieve this objective a detailed study is conducted employing analytical as well as system identification techniques. Analytical approach although less accurate complements system identification process. This synergy is exploited along with statistical and time domain tests to arrive at a high fidelity model. It is argued that such an integrated approach is suitable for modelling a class of unmanned air vehicles. The SI model is then employed for controller synthesis. Finally, real-time pitch control under stick command is demonstrated utilising classical PI control law.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"10 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":"114995140","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
VLSI Implementation of an Efficient Pre-Trace Back Approach for Viterbi Algorithm Viterbi算法高效预跟踪方法的VLSI实现
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379902
R. Manzoor, A. Rafique, K.B. Bajwa
{"title":"VLSI Implementation of an Efficient Pre-Trace Back Approach for Viterbi Algorithm","authors":"R. Manzoor, A. Rafique, K.B. Bajwa","doi":"10.1109/IBCAST.2007.4379902","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379902","url":null,"abstract":"This article focuses on trace back unit of Viterbi algorithm for constraint length K = 7. Conventional trace back unit comprises of three types of memory operations: decision bits write, trace back read & decode read whereas the pre-trace back approach exploits the inherent parallelism between the decision bits write & decode traceback operation. This approach results in reduction in latency & hardware. In this article, the implementation of trace back unit using pre-traceback approach is presented. The design has been implemented using high-level Verilog HDL and functionally verified by mapping on to Xilinx Virtex2P FPGA.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"235 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":"123884478","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
Design and Development of an Offset-Beam Slotted Waveguide Antenna 偏置波束开槽波导天线的设计与研制
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379901
R. Bhatti, A. lkram, J. Kayani
{"title":"Design and Development of an Offset-Beam Slotted Waveguide Antenna","authors":"R. Bhatti, A. lkram, J. Kayani","doi":"10.1109/IBCAST.2007.4379901","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379901","url":null,"abstract":"Planar slotted waveguide antennas usually have their main-beam pointed perpendicular to the antenna aperture. While this arrangement is most practical and convenient from design point of view, it suffers a serious setback in that it offers large RCS in the direction of antenna main-beam. This paper presents the design and testing of an offset-beam antenna for low RCS applications. A linear traveling wave antenna is designed at Ku-band. It consists of 18 radiating slots cut in the broadwall of the waveguide. A 25 dB Taylor aperture distribution is used to reduce sidelobes. The antenna is simulated and optimized using high frequency structure simulator (HFSS) software. Manufacturing of the antenna was done using high precision CNC milling machine. After assembly, the antenna was characterized by measuring its scattering parameters and radiation pattern. Measured results are fairly close to the theoretically predicted and simulated results. Gain of the antenna is 15.0 dB over a bandwidth of 500 MHz. Power absorbed into the load is 20% and return loss is below -30 dB. First side lobe level (SLL) is 23.5 dB down and azimuth beam width is 7.0deg with beam pointing at an offset angle of 20deg in azimuth plane.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"25 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":"114301848","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
Design of a Low Side Lobe Slotted Waveguide Planar Array 低旁瓣开槽波导平面阵列的设计
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379903
S. Dar, Z. Ahmed, M. bin Ihsan
{"title":"Design of a Low Side Lobe Slotted Waveguide Planar Array","authors":"S. Dar, Z. Ahmed, M. bin Ihsan","doi":"10.1109/IBCAST.2007.4379903","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379903","url":null,"abstract":"In this paper, characterization of waveguide slots in an FEM based EM analysis software has been discussed. Characterization has been done for longitudinal broad wall radiating slot and centered-inclined broad wall coupling slot. Using this characterization, a Ku band 8 times 8 planar array antenna has been designed with Elliot's design equations. Its performance was first checked in an FEM analysis software. The antenna has been fabricated and tested. Both simulated and measured results have been presented, they are in good agreement.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"51 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":"131720457","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
Design, Fabrication and Testing of a Millimeter Wave Slotted Waveguide Antenna 毫米波缝隙波导天线的设计、制造与测试
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379908
Z. Wasim, R. Bhatti, J. Kayani
{"title":"Design, Fabrication and Testing of a Millimeter Wave Slotted Waveguide Antenna","authors":"Z. Wasim, R. Bhatti, J. Kayani","doi":"10.1109/IBCAST.2007.4379908","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379908","url":null,"abstract":"The ever-growing demand of higher data rates is pushing the modern wireless communication systems towards millimeter wave frequency band (30-300 GHz). At these frequencies the available bandwidth is much larger, resulting into increased data rates. Thus, there is a growing demand of efficient antennas operating at these high frequencies. This paper deals with the design of linear and planar resonant antennas at 38 GHz. Design is based on Elliot's formulation. HFSS (high frequency structure simulator) is used to simulate and tune the slot dimensions. Simulated and measured results are in good agreement.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"49 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":"124764492","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
Dual Band Tunable LNA for Flexible RF Front End 柔性射频前端的双频可调谐LNA
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379900
N. Ahsan, Aziz Ouacha, Jerzy Dabrowskil, Carl Samuelsson
{"title":"Dual Band Tunable LNA for Flexible RF Front End","authors":"N. Ahsan, Aziz Ouacha, Jerzy Dabrowskil, Carl Samuelsson","doi":"10.1109/IBCAST.2007.4379900","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379900","url":null,"abstract":"This paper presents a dual band LNA that can be switched between two bands (2.4 GHz & 5.2 GHz) for IEEE 802.1 la/b/g WLAN applications. The LNA is also tunable within each band and the tuning is incorporated by on-chip varactors. The test chip consists of two fully integrated narrow-band tunable LNAs along with SPDT switch. For power saving one LNA can be switched off. The technology process is 0.2 mum GaAs offered by OMMIC. The LNA can achieve a relatively good performance over the two bands as demonstrated by simulation. With a 3V supply, the LNA has a gain of 26.2 dB at 2.4 GHz and 21.8 dB at 5.2 GHz and the corresponding NF varies between 2.07 dB and 1.84 dB, respectively. The LNA has an IIP3 of -7 dBm at 2.4 GHz and -1.6 dBm at 5.2 GHz.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"37 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":"128446497","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: 15
A Comparative Study of Different Geodetic Boundary Value Solutions for Geoid with reference to its Calibration Using GPS/Leveling Data 基于GPS/水准资料标定的大地水准面不同边界值解的比较研究
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379914
M. Sadiq, Z. Ahmad, M. Ayub
{"title":"A Comparative Study of Different Geodetic Boundary Value Solutions for Geoid with reference to its Calibration Using GPS/Leveling Data","authors":"M. Sadiq, Z. Ahmad, M. Ayub","doi":"10.1109/IBCAST.2007.4379914","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379914","url":null,"abstract":"The equipotential geoid of the gravity field of the Earth can be modeled with different formulation of the geodetic boundary value problems and their solutions. These techniques range from Helmert's 2nd method of condensation to Residual terrain modeling and then to the Molodenskij solution of the geodetic boundary value problem. The available data for gravity anomalies, elevation and their distribution within Pakistan requires careful study and selection from these solution methods. This study involves the comparison and discussion of different geoid modeling techniques with the geoid determined from GPS / Leveling data. Each of the above mentioned techniques has some advantages and drawbacks due to their data requirement, computational technique and validation of results. This calibration study will help to establish the selection of the suitable method for extended study of geoid model all over Pakistan. These techniques were implemented and tested in central area of Pakistan having diverse landscape with elevation range from 106m to 1522m above mean sea level. A statistical 3D regression model was developed for the compensation of offset between different geoidal solutions.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"35 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114024008","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
High Power LDMOS Transistor for RF-Amplifiers 用于射频放大器的大功率LDMOS晶体管
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379896
A. Kashif, C. Svensson, Q. Wahab
{"title":"High Power LDMOS Transistor for RF-Amplifiers","authors":"A. Kashif, C. Svensson, Q. Wahab","doi":"10.1109/IBCAST.2007.4379896","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379896","url":null,"abstract":"We designed simulated and optimized laterally diffused Si-MOSFET (LDMOS) transistors in Sentaurus TCAD software. By introducing excess interface charge density at the RESURF (reduced surface field) region, a power density 1.5 W/mm with a PAE (power added efficiency) of 45% at 3 GHz were obtained. The gain was 20.3 dB. These results show the enhancement in RF performance by introducing excess interface charge density at the RESURF region.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"115 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":"124805463","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
Simulation and Visualization of Transmission Control Protocol's (TCP) Flow-Control and Multi-Home Options 传输控制协议(TCP)流量控制和多主机选项的仿真与可视化
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379922
M. Qureshi, M. Saleem
{"title":"Simulation and Visualization of Transmission Control Protocol's (TCP) Flow-Control and Multi-Home Options","authors":"M. Qureshi, M. Saleem","doi":"10.1109/IBCAST.2007.4379922","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379922","url":null,"abstract":"Transmission control protocol (TCP) is used for reliable data transfer on the Internet today and has been carrying more than 90% of the Internet traffic. One of its main strengths is its use of flow control algorithms that allows TCP to reduce the rate at which it sends data if network congestion is encountered. TCP multi-home option makes it possible to handle multiple local and remote address pairs in one TCP session and to survive network outages by finding out an alternative network path. However, flow control algorithms arc complex and hard to understand; traditional methods of teaching how flow control algorithms work, such as viewing sliding window illustrations, do not illustrate flow control algorithm dynamics well; a better method would be to use a TCP simulator that not only visualizes TCP multi-home option and flow control algorithm operations happening in real time, but also allows users to experiment with simulating different flow control algorithms under different congestion conditions. Simulation modeling allows system developers and analysts to predict the performance of existing or proposed systems under different configurations or operating policies. The OMNeT++ tool is used to simulate and predict the performance of the TCP's issues involved in this arc pointed out. The aim of this paper is to produce a visual TCP simulator that acts as an interactive teaching/demonstration tool by allowing users to experiment with simulating different TCP flow control and multi-home options algorithms over different data traffic conditions that are similar to those encountered on the Internet in real life.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"4 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":"122583499","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: 4
Optimization of Vehicle Motion Near the Rough Sea 波涛汹涌海面上车辆运动的优化
2007 International Bhurban Conference on Applied Sciences & Technology Pub Date : 2007-11-12 DOI: 10.1109/IBCAST.2007.4379926
S. Brodsky
{"title":"Optimization of Vehicle Motion Near the Rough Sea","authors":"S. Brodsky","doi":"10.1109/IBCAST.2007.4379926","DOIUrl":"https://doi.org/10.1109/IBCAST.2007.4379926","url":null,"abstract":"The stochastic models of attitude estimation errors for vehicle moving near to the rough surface are presented. These models are suitable for solving the task of perfection of stabilization and motion control algorithms for the vehicle motion at the disturbed sea.","PeriodicalId":259890,"journal":{"name":"2007 International Bhurban Conference on Applied Sciences & Technology","volume":"48 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":"128440081","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
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