Pub Date : 2013-05-02DOI: 10.1109/IBCAST.2013.6512140
S. Amir, Haihui Wang, Fangtao Sun
Mass Spectrometry (MS) is one of the main detection tools for high-throughput proteomics. The preprocessing of mass spectra is fundamental for its successive examination like biomarker detection or protein identification. Peaks are extracted from a data set for biomarker identification. Biomarkers are useful for differentiating diseased and normal samples. Framelet transform has gradually become one of the important methodologies in the MS data preprocessing. The smoothing and baseline removal are important steps of the preprocessing of mass spectra. Nonlinear diffusion method has been effectively used in removing unimportant, minor variations while keeping vital features such as discontinuities. This paper reviews the application of diffusion based framelet transform in preprocessing stages for smoothing and peak detection of MS data.
{"title":"Application of diffusion based framelet transform to the MS-based proteomics data preprocessing","authors":"S. Amir, Haihui Wang, Fangtao Sun","doi":"10.1109/IBCAST.2013.6512140","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512140","url":null,"abstract":"Mass Spectrometry (MS) is one of the main detection tools for high-throughput proteomics. The preprocessing of mass spectra is fundamental for its successive examination like biomarker detection or protein identification. Peaks are extracted from a data set for biomarker identification. Biomarkers are useful for differentiating diseased and normal samples. Framelet transform has gradually become one of the important methodologies in the MS data preprocessing. The smoothing and baseline removal are important steps of the preprocessing of mass spectra. Nonlinear diffusion method has been effectively used in removing unimportant, minor variations while keeping vital features such as discontinuities. This paper reviews the application of diffusion based framelet transform in preprocessing stages for smoothing and peak detection of MS data.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"161 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133765399","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}
Pub Date : 2013-05-02DOI: 10.1109/IBCAST.2013.6512183
S. Iqbal, M. Amin, J. Yousaf
In this paper a dual mode helix is being proposed whereby the combined antenna acts as a single structure comprising of two quadrifilar helix antennas running in parallel and connected at top radial sections and sideways helical sections through pin diodes switches in such a way that space and land mode can be selected by the application of appropriate dc voltages at the terrestrial and space feeds. In this way, at one time, both QHA either act in space mode or in land mode, thus eliminating the problem of mutual coupling that arises when two independent antennas are used in collocation. The structure uses a triaxial cable and pin diodes with very low forward impedance and high reverse impedance. The structure by open-circuiting and short circuiting the wires at certain points shifts the effective feed point to the centre of the radial section to generate CP pattern suitable for space communication and to the centre of the helical section to obtain current distribution required to generate omnidirectional pattern suitable for terrestrial communication. The simulation results show that the QHA in the space mode has a gain of 5.4dB, 3-dB beamwidth 118° and front-to-back ratio of 12.35dB. In terrestrial mode gain and 3-dB beamwidth are 2.26dB and 93° respectively.
{"title":"Switchable dual-mode helix antenna","authors":"S. Iqbal, M. Amin, J. Yousaf","doi":"10.1109/IBCAST.2013.6512183","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512183","url":null,"abstract":"In this paper a dual mode helix is being proposed whereby the combined antenna acts as a single structure comprising of two quadrifilar helix antennas running in parallel and connected at top radial sections and sideways helical sections through pin diodes switches in such a way that space and land mode can be selected by the application of appropriate dc voltages at the terrestrial and space feeds. In this way, at one time, both QHA either act in space mode or in land mode, thus eliminating the problem of mutual coupling that arises when two independent antennas are used in collocation. The structure uses a triaxial cable and pin diodes with very low forward impedance and high reverse impedance. The structure by open-circuiting and short circuiting the wires at certain points shifts the effective feed point to the centre of the radial section to generate CP pattern suitable for space communication and to the centre of the helical section to obtain current distribution required to generate omnidirectional pattern suitable for terrestrial communication. The simulation results show that the QHA in the space mode has a gain of 5.4dB, 3-dB beamwidth 118° and front-to-back ratio of 12.35dB. In terrestrial mode gain and 3-dB beamwidth are 2.26dB and 93° respectively.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131199401","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}
Pub Date : 2013-05-02DOI: 10.1109/IBCAST.2013.6512147
A. Shahzad, R. Ur-Rehman
For some specified targets, it is desired to identify the optimal configuration for the assignment of weapons for a given deployment of different types of weapon systems along with their required quantity in order to achieve a desired level of damage subject to the minimal cost and mission specific constraints. This problem, in its essence, is an NP-complete combinatorial optimization problem in the area of command and control research. In defense-related applications of artificial intelligence, this problem is referred as Weapon Target Assignment (WTA) problem. The problem can be formulated as a non-linear integer programming problem for which no exact methods exist to solve even the small size instances. Our focus is on the Dynamic Weapon Target Assignment (DWTA) problem. A discrete-event system simulation model is developed taking into account the resource constraints, resource capability constraints, strategy constraints and engagement feasibility constraints. Three different methods are employed; MMR, Reactive Tabu Search and a newly proposed artificial intelligence based simulation-optimization hybrid framework. A set of rules is generated based on the optimization module that is then employed for real-time control. The computational results show very promising prospects of the proposed approach, not only for DWTA but also for any real-time decision-making problem like Cooperative Unmanned Air Vehicle Mission Assignment etc.
{"title":"An artificial intelligence based novel approach for real-time allocation of armament to hostile targets","authors":"A. Shahzad, R. Ur-Rehman","doi":"10.1109/IBCAST.2013.6512147","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512147","url":null,"abstract":"For some specified targets, it is desired to identify the optimal configuration for the assignment of weapons for a given deployment of different types of weapon systems along with their required quantity in order to achieve a desired level of damage subject to the minimal cost and mission specific constraints. This problem, in its essence, is an NP-complete combinatorial optimization problem in the area of command and control research. In defense-related applications of artificial intelligence, this problem is referred as Weapon Target Assignment (WTA) problem. The problem can be formulated as a non-linear integer programming problem for which no exact methods exist to solve even the small size instances. Our focus is on the Dynamic Weapon Target Assignment (DWTA) problem. A discrete-event system simulation model is developed taking into account the resource constraints, resource capability constraints, strategy constraints and engagement feasibility constraints. Three different methods are employed; MMR, Reactive Tabu Search and a newly proposed artificial intelligence based simulation-optimization hybrid framework. A set of rules is generated based on the optimization module that is then employed for real-time control. The computational results show very promising prospects of the proposed approach, not only for DWTA but also for any real-time decision-making problem like Cooperative Unmanned Air Vehicle Mission Assignment etc.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115940287","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}
Pub Date : 2013-05-02DOI: 10.1109/IBCAST.2013.6512195
A. Jafri, A. Baghdadi
In pursuit of bringing high end applications on radio platforms, recent and evolving wireless standards impose stringent requirements in the shape of high throughputs, error rate performance close to theoretical limits and multi mode transmissions to efficiently use bandwidth in different channel conditions. In the presence of these requirements, the designer comes across contradicting requirements. In fact, in order to handle error rate performance the iterative (Turbo) processing (Turbo/LDPC decoding, Turbo demodulation and Turbo Equalization) is common implementation practice in baseband receivers. However, this creates bottleneck in achieving imposed throughputs. In this scenario, parallelism study and resulting throughput gains while keeping same error rate convergence, provides the designer concrete results to establish compromise among design constraints. In this paper, first of all three level of parallelism study is presented on turbo decoding, turbo demodulation and MIMO turbo equalization. To aid the designer in taking decision during the design, mathematical expressions for throughput gain in unified parallel turbo receiver are provided. Throughput gain for different system scenarios are computed by using system parameters and simulation results in derived expressions.
{"title":"Convergence throughput gain in a unified parallel turbo receiver","authors":"A. Jafri, A. Baghdadi","doi":"10.1109/IBCAST.2013.6512195","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512195","url":null,"abstract":"In pursuit of bringing high end applications on radio platforms, recent and evolving wireless standards impose stringent requirements in the shape of high throughputs, error rate performance close to theoretical limits and multi mode transmissions to efficiently use bandwidth in different channel conditions. In the presence of these requirements, the designer comes across contradicting requirements. In fact, in order to handle error rate performance the iterative (Turbo) processing (Turbo/LDPC decoding, Turbo demodulation and Turbo Equalization) is common implementation practice in baseband receivers. However, this creates bottleneck in achieving imposed throughputs. In this scenario, parallelism study and resulting throughput gains while keeping same error rate convergence, provides the designer concrete results to establish compromise among design constraints. In this paper, first of all three level of parallelism study is presented on turbo decoding, turbo demodulation and MIMO turbo equalization. To aid the designer in taking decision during the design, mathematical expressions for throughput gain in unified parallel turbo receiver are provided. Throughput gain for different system scenarios are computed by using system parameters and simulation results in derived expressions.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127487547","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}
Pub Date : 2013-05-02DOI: 10.1109/IBCAST.2013.6512149
S. T. ul Islam Rizvi, H. Linshu, N. Naseemullah
A wing-body re-entry vehicle has higher lift-to-drag ratio and enhances the down-range and the cross range of a ballistic vehicle. In the present study, trade-off analysis has been carried out between vehicle performance and flight parameters with variation in burn out angle at suborbital speeds. The vehicle during its re-entry flight is subjected to extreme heat rate and very high dynamic pressures. The re-entry range is maximized for shallow entry angles. Lowering the re-entry angle implies lowering the flight path angle at the burn out point. This results in increase in re-entry range and reduction of free flight range. These two parameters affect the overall range of the vehicle. Longer flight times at shallow re-entry angles also result in an increase of the total heat load. The burn-out angle also affects the g-load required to initiate the initial skip. This paper discusses the sensitivity of total heat load, maximum normal acceleration, range and the flight time once the re-entry trajectory is optimized for maximum down range subject to maximum dynamic pressure constraint of 350 KPa and 3 MW/m2 of heat rate limit for a range of burn-out velocities and burn-out angles. All trajectories within the matrix have been optimized for maximum down range/cross range using hp-adaptive pseudospectral method. The optimal angle-of-attack and bank angle control deflections have also been discussed. It has been found that for a boost-glide wing-body vehicle, the range advantage is of more than 35 percent as compared to bi-conic re-entry vehicle. Near optimal down range is obtained at burn-out angle of approximately 15 degree. The g-loads and angle-of-attack trim control requirements remain within limits. Cross-ranges of the order of 800 to 2000 km can be obtained with in the medium to intermediate range using wing-body re-entry vehicle design.
{"title":"Vehicle performance tradeoff study for a small size lifting re-entry vehicle","authors":"S. T. ul Islam Rizvi, H. Linshu, N. Naseemullah","doi":"10.1109/IBCAST.2013.6512149","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512149","url":null,"abstract":"A wing-body re-entry vehicle has higher lift-to-drag ratio and enhances the down-range and the cross range of a ballistic vehicle. In the present study, trade-off analysis has been carried out between vehicle performance and flight parameters with variation in burn out angle at suborbital speeds. The vehicle during its re-entry flight is subjected to extreme heat rate and very high dynamic pressures. The re-entry range is maximized for shallow entry angles. Lowering the re-entry angle implies lowering the flight path angle at the burn out point. This results in increase in re-entry range and reduction of free flight range. These two parameters affect the overall range of the vehicle. Longer flight times at shallow re-entry angles also result in an increase of the total heat load. The burn-out angle also affects the g-load required to initiate the initial skip. This paper discusses the sensitivity of total heat load, maximum normal acceleration, range and the flight time once the re-entry trajectory is optimized for maximum down range subject to maximum dynamic pressure constraint of 350 KPa and 3 MW/m2 of heat rate limit for a range of burn-out velocities and burn-out angles. All trajectories within the matrix have been optimized for maximum down range/cross range using hp-adaptive pseudospectral method. The optimal angle-of-attack and bank angle control deflections have also been discussed. It has been found that for a boost-glide wing-body vehicle, the range advantage is of more than 35 percent as compared to bi-conic re-entry vehicle. Near optimal down range is obtained at burn-out angle of approximately 15 degree. The g-loads and angle-of-attack trim control requirements remain within limits. Cross-ranges of the order of 800 to 2000 km can be obtained with in the medium to intermediate range using wing-body re-entry vehicle design.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121396430","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}
Pub Date : 2013-05-02DOI: 10.1109/IBCAST.2013.6512150
F. M. Villanueva, H. Linshu, A. F. Rafique, T. Rahman
A hybrid optimization approach combining a genetic algorithm (GA) with sequential quadratic programming (SQP) has been used for optimization of the trajectory profile of a three stage solid propellant small launch vehicle configured from existing solid rocket motors. The selected launch vehicle (LV) is capable of delivering a small satellite of 80 kg to a low earth orbit (LEO) of 660 km altitude. This hybrid optimization approach combines the advantage of GA as a global optimizer and complemented with SQP to find the local optimum. The vertical flight time, launch maneuver variable, maximum angle of attack, coasting time between the first and second stage and the second coasting time between the second and third stage were optimized. It is shown that the proposed hybrid optimization approach was able to find the convergence of the optimal solution with very acceptable values.
{"title":"Small launch vehicle trajectory profile optimization using hybrid algorithm","authors":"F. M. Villanueva, H. Linshu, A. F. Rafique, T. Rahman","doi":"10.1109/IBCAST.2013.6512150","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512150","url":null,"abstract":"A hybrid optimization approach combining a genetic algorithm (GA) with sequential quadratic programming (SQP) has been used for optimization of the trajectory profile of a three stage solid propellant small launch vehicle configured from existing solid rocket motors. The selected launch vehicle (LV) is capable of delivering a small satellite of 80 kg to a low earth orbit (LEO) of 660 km altitude. This hybrid optimization approach combines the advantage of GA as a global optimizer and complemented with SQP to find the local optimum. The vertical flight time, launch maneuver variable, maximum angle of attack, coasting time between the first and second stage and the second coasting time between the second and third stage were optimized. It is shown that the proposed hybrid optimization approach was able to find the convergence of the optimal solution with very acceptable values.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130464179","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}
Pub Date : 2013-05-02DOI: 10.1109/IBCAST.2013.6512135
T. Mu, L. Zhou, J. N. Yang
Base isolation systems have been widely used in civil structures as protective devices against earthquakes, hurricanes, etc., and the state assessment using vibration data for the safety, reliability and integrity of base-isolated structures is very important in structural health monitoring. In the case of field engineering applications, external excitations, such as seismic inputs, wind inputs, etc., usually could not be measured, or even could not be measurable. Herein, an adaptive extended Kalman filter approach for structural parameter tracking under unknown seismic input, which is referred to as AEKF-UI approach, is developed to on-line track the base-isolated structural time-varying parameters, including the damping, stiffness, nonlinear hysteretic parameters, etc., and identify the unmeasured seismic input. The experimental results of vibration tests demonstrate the fact that the AEKF-UI method developed is able to achieve real-time parameter tracking of base-isolated structure under unknown seismic input, leading to the on-line identification of structural damages.
{"title":"Adaptive extended Kalman filter for parameter tracking of base-isolated structure under unknown seismic input","authors":"T. Mu, L. Zhou, J. N. Yang","doi":"10.1109/IBCAST.2013.6512135","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512135","url":null,"abstract":"Base isolation systems have been widely used in civil structures as protective devices against earthquakes, hurricanes, etc., and the state assessment using vibration data for the safety, reliability and integrity of base-isolated structures is very important in structural health monitoring. In the case of field engineering applications, external excitations, such as seismic inputs, wind inputs, etc., usually could not be measured, or even could not be measurable. Herein, an adaptive extended Kalman filter approach for structural parameter tracking under unknown seismic input, which is referred to as AEKF-UI approach, is developed to on-line track the base-isolated structural time-varying parameters, including the damping, stiffness, nonlinear hysteretic parameters, etc., and identify the unmeasured seismic input. The experimental results of vibration tests demonstrate the fact that the AEKF-UI method developed is able to achieve real-time parameter tracking of base-isolated structure under unknown seismic input, leading to the on-line identification of structural damages.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133774543","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}
Pub Date : 2013-05-02DOI: 10.1109/IBCAST.2013.6512168
Lin Zhang, Ruiri Jin, Wei Zhao, D. Shang, Peng Mu
The purpose of this paper is to study effects of the flow-structure interaction on acoustic radiation of an underwater structure-a hydrofoil. The hydrofoil vibrational modes were analysed numerically, acoustic field resulting from the flow-structure interaction with different flow velocity was investigated by simulation. First, use the software SYSNOISE to analysis the hydrofoil structural and coupled modes. Second, using the fluid dynamic calculation software FLUENT to simulate the flow field around the hydrofoil. The flow fields of different flow velocity are obtained. Then import the results to an acoustic finite element code ACTRAN, and obtain the turbulent fluctuating pressure on the structure surface. Make the pressure as a load applied to the structure surface, and calculate the acoustic field of the structure vibration. The computations showed that the flow-structure interaction makes the structure vibrational modes shift to lower frequencies and adds more low-frequency vibrational modes. The vibrations of the structure strengthen in low frequencies. Therefore the acoustic energy generated from the structural vibrations is increased in low frequencies. At low frequencies, the structural vibrations and radiated acoustic power are stronger, but have a great fluctuation. The fluctuation will decrease as the frequency increases. Also the acoustic power radiated from the flow-structure interaction will increase as the flow velocity increases. There is a stable increment in radiated acoustic power as the flow velocity increases.
{"title":"Flow-structure interaction on acoustic radiation of an underwater structure","authors":"Lin Zhang, Ruiri Jin, Wei Zhao, D. Shang, Peng Mu","doi":"10.1109/IBCAST.2013.6512168","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512168","url":null,"abstract":"The purpose of this paper is to study effects of the flow-structure interaction on acoustic radiation of an underwater structure-a hydrofoil. The hydrofoil vibrational modes were analysed numerically, acoustic field resulting from the flow-structure interaction with different flow velocity was investigated by simulation. First, use the software SYSNOISE to analysis the hydrofoil structural and coupled modes. Second, using the fluid dynamic calculation software FLUENT to simulate the flow field around the hydrofoil. The flow fields of different flow velocity are obtained. Then import the results to an acoustic finite element code ACTRAN, and obtain the turbulent fluctuating pressure on the structure surface. Make the pressure as a load applied to the structure surface, and calculate the acoustic field of the structure vibration. The computations showed that the flow-structure interaction makes the structure vibrational modes shift to lower frequencies and adds more low-frequency vibrational modes. The vibrations of the structure strengthen in low frequencies. Therefore the acoustic energy generated from the structural vibrations is increased in low frequencies. At low frequencies, the structural vibrations and radiated acoustic power are stronger, but have a great fluctuation. The fluctuation will decrease as the frequency increases. Also the acoustic power radiated from the flow-structure interaction will increase as the flow velocity increases. There is a stable increment in radiated acoustic power as the flow velocity increases.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133721334","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}
Pub Date : 2013-05-02DOI: 10.1109/IBCAST.2013.6512201
Fatima Arneeb Farrukh, F. Ahsan, M. Yasin, S. A. Khan
Cost-effective and compact systems are required for modern airborne earth surveillance and observation platforms. Frequency Modulated Continuous Wave (FMCW) technology and synthetic aperture techniques together yield such systems. FMCW systems are very useful for earth surveillance in both civil and military applications. Huge computation power is required for real time Synthetic Aperture Radar (SAR) processing. SAR system should be simulated before actual system development in order to understand, analyze and estimate its performance. In this paper, development of Offline SAR Signal Processor and Test Data Generator is presented. SAR Processor forms focused images using raw data either generated from Test Data Generator or acquired from real FMCW SAR system. For the validation of image formation algorithms before actual system development, synthetic/test data is needed. Test Data Generator development fulfills this purpose.
{"title":"Design and development of offline processor and test data generator for FMCW SAR","authors":"Fatima Arneeb Farrukh, F. Ahsan, M. Yasin, S. A. Khan","doi":"10.1109/IBCAST.2013.6512201","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512201","url":null,"abstract":"Cost-effective and compact systems are required for modern airborne earth surveillance and observation platforms. Frequency Modulated Continuous Wave (FMCW) technology and synthetic aperture techniques together yield such systems. FMCW systems are very useful for earth surveillance in both civil and military applications. Huge computation power is required for real time Synthetic Aperture Radar (SAR) processing. SAR system should be simulated before actual system development in order to understand, analyze and estimate its performance. In this paper, development of Offline SAR Signal Processor and Test Data Generator is presented. SAR Processor forms focused images using raw data either generated from Test Data Generator or acquired from real FMCW SAR system. For the validation of image formation algorithms before actual system development, synthetic/test data is needed. Test Data Generator development fulfills this purpose.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123208849","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}
Pub Date : 2013-05-02DOI: 10.1109/IBCAST.2013.6512139
S. Anwar, Qingjie Zhao, Nouman Qadeer, Saqib Ishaq Khan
Simultaneous Localization and Mapping, SLAM, is an important topic in the field of robotics and autonomous navigation. The metric SLAM suffers from sensor inaccuracies and thus cannot be used for long-term navigation. In such case, Visual SLAM or a Hybrid SLAM based on both metric and visual approach is a good alternative. In this paper, in order to speed up a Visual SLAM, we propose a novel concept of dynamic dictionary generated on the results of triangulation done on RF, radio frequency, signals from nearest cell towers of a cellular network. This dynamic dictionary efficiently manages the scalability of a Visual SLAM and make it possible to work in a large-scale environment. A framework is proposed along with triangulation data of a city and with simulations to support the concept.
同时定位与绘图(Simultaneous Localization and Mapping, SLAM)是机器人技术和自主导航领域的一个重要课题。公制SLAM受到传感器不精确的影响，因此不能用于长期导航。在这种情况下，Visual SLAM或基于度量和可视化方法的混合SLAM是一个很好的选择。在本文中，为了加快visualslam的速度，我们提出了一种动态字典的新概念，该字典是根据蜂窝网络中最近的蜂窝塔的射频、射频信号的三角测量结果生成的。这个动态字典有效地管理了Visual SLAM的可伸缩性，使其能够在大规模环境中工作。提出了一个框架，并结合一个城市的三角测量数据和模拟来支持这个概念。
{"title":"A framework for RF-Visual SLAM","authors":"S. Anwar, Qingjie Zhao, Nouman Qadeer, Saqib Ishaq Khan","doi":"10.1109/IBCAST.2013.6512139","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512139","url":null,"abstract":"Simultaneous Localization and Mapping, SLAM, is an important topic in the field of robotics and autonomous navigation. The metric SLAM suffers from sensor inaccuracies and thus cannot be used for long-term navigation. In such case, Visual SLAM or a Hybrid SLAM based on both metric and visual approach is a good alternative. In this paper, in order to speed up a Visual SLAM, we propose a novel concept of dynamic dictionary generated on the results of triangulation done on RF, radio frequency, signals from nearest cell towers of a cellular network. This dynamic dictionary efficiently manages the scalability of a Visual SLAM and make it possible to work in a large-scale environment. A framework is proposed along with triangulation data of a city and with simulations to support the concept.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123311497","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}
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