Pub Date : 2019-01-01DOI: 10.1109/IBCAST.2019.8667233
Faizan Munawar, Uzair Khan, A. Shahzad, Mahmood Ul Haq, Z. Mahmood, S. Khattak, Gul Zameen Khan
Face image resolution and pose are two important factors that severely degrade the recognition ability. This paper presents a comparison of (i) the Wavelet Transform, (ii) the 2DPCA, (iii) the AdaBoost-LDA, and (iv) Fisherfaces based face recognition algorithms. Simulation results on the Multi-PIE database show that the 2DPCA face recognition algorithm can be reliably used for extremely low face image resolution of 15×15 pixels and from frontal (0°) to +35° of pose variation in near-real time. Whereas for high face image resolution of 40×40 pixels and up to 251×231 pixels, the Fisherfaces yields high accuracy across four different pose variation at the cost of much higher computation. Moreover, the recognition rate of the AdaBoost-LDA is unaffected by the image resolution from 251×231 down to 15×15 pixels. In addition, time cost comparison is also shown.
{"title":"An Empirical Study of Image Resolution and Pose on Automatic Face Recognition","authors":"Faizan Munawar, Uzair Khan, A. Shahzad, Mahmood Ul Haq, Z. Mahmood, S. Khattak, Gul Zameen Khan","doi":"10.1109/IBCAST.2019.8667233","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667233","url":null,"abstract":"Face image resolution and pose are two important factors that severely degrade the recognition ability. This paper presents a comparison of (i) the Wavelet Transform, (ii) the 2DPCA, (iii) the AdaBoost-LDA, and (iv) Fisherfaces based face recognition algorithms. Simulation results on the Multi-PIE database show that the 2DPCA face recognition algorithm can be reliably used for extremely low face image resolution of 15×15 pixels and from frontal (0°) to +35° of pose variation in near-real time. Whereas for high face image resolution of 40×40 pixels and up to 251×231 pixels, the Fisherfaces yields high accuracy across four different pose variation at the cost of much higher computation. Moreover, the recognition rate of the AdaBoost-LDA is unaffected by the image resolution from 251×231 down to 15×15 pixels. In addition, time cost comparison is also shown.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127819602","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667244
Huma Rehman Baig, Ali Nasir
Space telescopic missions have been deployed for about half a century. Plenty of information about the characteristics of various asteroids and stars has been collected and analyzed through these missions. While there has been a lot of work done on the individual scheduling of space telescope missions, collaborative or coordinated scheduling of multiple space telescopes is relatively less explored. Coordinated scheduling is important to obtain scientific data in an efficient and robust manner. Therefore, this paper proposes a framework for coordinated target assignment of space telescopic missions that enables different satellites to share objectives of collection of scientific data. The proposed framework considers the cost involved in various scientific data collection activities with relevance to each individual space telescope. Satellite workload constraints and possibility of occurrence of faults have also been considered. Performance of the optimal policy calculated using the proposed model has been compared with a rule-based target assignment policy and superiority of the proposed approach has been demonstrated.
{"title":"Coordinated Target Assignment for Multi-Spacecraft Telescopic Missions","authors":"Huma Rehman Baig, Ali Nasir","doi":"10.1109/IBCAST.2019.8667244","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667244","url":null,"abstract":"Space telescopic missions have been deployed for about half a century. Plenty of information about the characteristics of various asteroids and stars has been collected and analyzed through these missions. While there has been a lot of work done on the individual scheduling of space telescope missions, collaborative or coordinated scheduling of multiple space telescopes is relatively less explored. Coordinated scheduling is important to obtain scientific data in an efficient and robust manner. Therefore, this paper proposes a framework for coordinated target assignment of space telescopic missions that enables different satellites to share objectives of collection of scientific data. The proposed framework considers the cost involved in various scientific data collection activities with relevance to each individual space telescope. Satellite workload constraints and possibility of occurrence of faults have also been considered. Performance of the optimal policy calculated using the proposed model has been compared with a rule-based target assignment policy and superiority of the proposed approach has been demonstrated.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129767384","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667192
He Xiping, Cui Xiaojuan, W. Yanjun, Ning jingfeng
In ultrasonic machining and processing or in underwater acoustics, the output end surface of a vibration system needs large amplitude to improve work efficiency. A uniform horn with a cuboid hole at front end is proposed for amplifying amplitude. The finite element method is used to calculate the displacement distribution, magnification factor of the output end surface and to optimize the geometrical size and the position of the cuboid hole at resonant frequency. The influence of position and geometrical size of the hole on resonant frequency of the horn is studied, and the maximum magnification factor can reach seven times greater than that of a uniform solid horn after optimization. The horn is connected to a longitudinal vibration transducer, the frequency, mode shape, displacement distribution of the output surface, and the amplitude magnification factor were measured by using a laser vibrometer. The experimental results were consistent with the analysis of the finite element calculation results. In addition, the test results also show that excitation voltage has a linear relationship with the output displacement of the horn.
{"title":"A high displacement ultrasonic horn with a cuboid hole in the front end","authors":"He Xiping, Cui Xiaojuan, W. Yanjun, Ning jingfeng","doi":"10.1109/IBCAST.2019.8667192","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667192","url":null,"abstract":"In ultrasonic machining and processing or in underwater acoustics, the output end surface of a vibration system needs large amplitude to improve work efficiency. A uniform horn with a cuboid hole at front end is proposed for amplifying amplitude. The finite element method is used to calculate the displacement distribution, magnification factor of the output end surface and to optimize the geometrical size and the position of the cuboid hole at resonant frequency. The influence of position and geometrical size of the hole on resonant frequency of the horn is studied, and the maximum magnification factor can reach seven times greater than that of a uniform solid horn after optimization. The horn is connected to a longitudinal vibration transducer, the frequency, mode shape, displacement distribution of the output surface, and the amplitude magnification factor were measured by using a laser vibrometer. The experimental results were consistent with the analysis of the finite element calculation results. In addition, the test results also show that excitation voltage has a linear relationship with the output displacement of the horn.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133288757","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667205
F. Gulzar, Y. Butt
This paper reports a novel approach for a microstrip based parallel line coupler designed at centre frequency of 16 GHz. The design is based on analytical computations and is simulated in Serenade Harmonica and validated experimentally. For experimental validation, a prototype was fabricated and tested using network analyzer. An issue of less spacing between parallel lines was identified and solved in a distinguished way i.e., by optimizing the shape ratios for the best response. Fabrication was done on GML substrate with thickness of 30 mils (0.762 mm) having relative permittivity of 3.2. Response of manufactured device was recorded over a 1.6 GHz bandwidth (10% of centre frequency) for its implementation at narrowband reception channel with required coupling of -11.5 dB. Experimental results of manufactured device were found in good agreement with simulation results in terms of coupling factor and S-Parameters. Device technology developed is found precise, simple and cheap, and is suitable for mass production.
{"title":"Design and Manufacturing of Ku Band Coupler","authors":"F. Gulzar, Y. Butt","doi":"10.1109/IBCAST.2019.8667205","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667205","url":null,"abstract":"This paper reports a novel approach for a microstrip based parallel line coupler designed at centre frequency of 16 GHz. The design is based on analytical computations and is simulated in Serenade Harmonica and validated experimentally. For experimental validation, a prototype was fabricated and tested using network analyzer. An issue of less spacing between parallel lines was identified and solved in a distinguished way i.e., by optimizing the shape ratios for the best response. Fabrication was done on GML substrate with thickness of 30 mils (0.762 mm) having relative permittivity of 3.2. Response of manufactured device was recorded over a 1.6 GHz bandwidth (10% of centre frequency) for its implementation at narrowband reception channel with required coupling of -11.5 dB. Experimental results of manufactured device were found in good agreement with simulation results in terms of coupling factor and S-Parameters. Device technology developed is found precise, simple and cheap, and is suitable for mass production.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129056381","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667267
M. Ashfaq, Farooq Alam, S. Hussain
This paper proposes practical implementation of current sensor-less robust control technique for DC-DC boost converter. Close loop feedback control of DC-DC boost converter requires inductor current as feedback signal. However, inductor current requires expensive sensor for measurement which increases overall cost and complexity of system. To reduce cost, complexity and other associated problems we propose robust method for the estimation of inductor current by employing Higher Gain Observer (HGO). Furthermore, for robust control of output voltage control we used Non singular terminal sliding mode control (NTSMC). Moreover, proposed sensor-less control strategy is practically implemented using Field Programmable Gate Arrays (FPGA). It is shown by simulation that proposed system is robust under parametric variations and unknown disturbances.
{"title":"Practical Implementation of Sensorless Robust Control of Boost Converter","authors":"M. Ashfaq, Farooq Alam, S. Hussain","doi":"10.1109/IBCAST.2019.8667267","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667267","url":null,"abstract":"This paper proposes practical implementation of current sensor-less robust control technique for DC-DC boost converter. Close loop feedback control of DC-DC boost converter requires inductor current as feedback signal. However, inductor current requires expensive sensor for measurement which increases overall cost and complexity of system. To reduce cost, complexity and other associated problems we propose robust method for the estimation of inductor current by employing Higher Gain Observer (HGO). Furthermore, for robust control of output voltage control we used Non singular terminal sliding mode control (NTSMC). Moreover, proposed sensor-less control strategy is practically implemented using Field Programmable Gate Arrays (FPGA). It is shown by simulation that proposed system is robust under parametric variations and unknown disturbances.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125289744","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667219
A. Salam, Cheng Xiaoquan, Xiaoqinq Li, Altaf Ahmed, Zhuang Qikai
In this study, the bearing strength of carbon fiber reinforced composite to metal bolted joint was investigated experimentally and numerically. The ply sequence used in test specimen was [02/±45/02/±45/90/0]s. Seven specimens were manufactured and tested on Instron 8802 hydraulic testing machine for tensile properties. A 3D finite element model was developed in Abaqus/standard using C3D8R elements. Hashin and Tan failure and degradation rules were applied in VUSDFLD subroutine file to predict failure initiation and progression. The comparison of failure modes and bearing strength at room temperature and at 250°C is presented. Results obtained from simulation and tesing are in good agreement. The results shows that at room temperature, the bearing strength of this joint is around 60% more than that at 250°C.
{"title":"Bearing Failure Analysis of Carbon Fiber Reinforced Composite to Metal Bolted Joint at Elevated Temperature","authors":"A. Salam, Cheng Xiaoquan, Xiaoqinq Li, Altaf Ahmed, Zhuang Qikai","doi":"10.1109/IBCAST.2019.8667219","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667219","url":null,"abstract":"In this study, the bearing strength of carbon fiber reinforced composite to metal bolted joint was investigated experimentally and numerically. The ply sequence used in test specimen was [02/±45/02/±45/90/0]s. Seven specimens were manufactured and tested on Instron 8802 hydraulic testing machine for tensile properties. A 3D finite element model was developed in Abaqus/standard using C3D8R elements. Hashin and Tan failure and degradation rules were applied in VUSDFLD subroutine file to predict failure initiation and progression. The comparison of failure modes and bearing strength at room temperature and at 250°C is presented. Results obtained from simulation and tesing are in good agreement. The results shows that at room temperature, the bearing strength of this joint is around 60% more than that at 250°C.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125417067","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667261
M. Ke, Zhang Jianfu, Feng Pingfa, Wu Zhijun, Yu Dingwen, Shahzad Ahmad
With great heat resistance, corrosion resistance, high specific strength and excellent mechanical properties, nomex honeycomb composites are widely used in aerospace industry. However, due to the special properties of the nomex honeycomb composites, traditional high-speed milling is difficult to complete the processing of the material. The ultrasonic processing method is one of the best ways to solve the above problem. In order to improve the ultrasonic power, the size of the ultrasound system structure is normally very large, which is inconvenient and uneconomical for processing the nomex honeycomb composites. A mini ultrasonic cutting system for paper - based honeycomb material is designed in this paper. Its output amplitude is realized under the condition of small size, and its processing performance is verified by experiments. Based on the theoretical anylysis, the design parameters of the presented mini ultrasonic cutting system were calculated. The resonant frequency, magnification and amplitude of the system were analyzing by simulation and amplitude test. The results showed the system parameters are consistent with the design value. The processing experiments of the honeycomb material indicated the system can effectively reduce the cutting force and improve the surface quality.
{"title":"Design and Implementation of a Mini Ultrasonic Cutting System for Nomex Honeycomb Composites","authors":"M. Ke, Zhang Jianfu, Feng Pingfa, Wu Zhijun, Yu Dingwen, Shahzad Ahmad","doi":"10.1109/IBCAST.2019.8667261","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667261","url":null,"abstract":"With great heat resistance, corrosion resistance, high specific strength and excellent mechanical properties, nomex honeycomb composites are widely used in aerospace industry. However, due to the special properties of the nomex honeycomb composites, traditional high-speed milling is difficult to complete the processing of the material. The ultrasonic processing method is one of the best ways to solve the above problem. In order to improve the ultrasonic power, the size of the ultrasound system structure is normally very large, which is inconvenient and uneconomical for processing the nomex honeycomb composites. A mini ultrasonic cutting system for paper - based honeycomb material is designed in this paper. Its output amplitude is realized under the condition of small size, and its processing performance is verified by experiments. Based on the theoretical anylysis, the design parameters of the presented mini ultrasonic cutting system were calculated. The resonant frequency, magnification and amplitude of the system were analyzing by simulation and amplitude test. The results showed the system parameters are consistent with the design value. The processing experiments of the honeycomb material indicated the system can effectively reduce the cutting force and improve the surface quality.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116684287","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667228
Altaf Ahmed, Jia Guozhu, A. Salam, Muhammad Kashif Nawaz
Collaborative assembly is envisaged as a prospect of industry 4.0 which involves co-working between robot and human. This methodology combines the strength and dexterity of a robot with sensory skills of human to achieve quality and precision in the assembly process. The collaborative assembly has been in focus in recent times, however, less attention has been paid to its quality and reliability aspect. Since both human worker and robot add variation to the process, making it prone to inaccuracy, defects and, rejection, it is indispensable to assess its effectiveness in terms of quality and reliability. This paper presents an approach for reliability and quality control in a collaborative assembly process. In this regard, key characteristics of assembly and process parameters of both human and robot have been identified, and their influence on assembly quality is determined. The parameters analyzed using correlation and regression modeling. Based on the analysis of data and results, a sensitivity analysis is done, and a control mechanism is formulated. The proposed approach has been applied to a collaborative assembly process of an industrial case to exemplify it, and promising results have been obtained.
{"title":"Reliability and Quality Control Approach for Collaborative Assembly Process","authors":"Altaf Ahmed, Jia Guozhu, A. Salam, Muhammad Kashif Nawaz","doi":"10.1109/IBCAST.2019.8667228","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667228","url":null,"abstract":"Collaborative assembly is envisaged as a prospect of industry 4.0 which involves co-working between robot and human. This methodology combines the strength and dexterity of a robot with sensory skills of human to achieve quality and precision in the assembly process. The collaborative assembly has been in focus in recent times, however, less attention has been paid to its quality and reliability aspect. Since both human worker and robot add variation to the process, making it prone to inaccuracy, defects and, rejection, it is indispensable to assess its effectiveness in terms of quality and reliability. This paper presents an approach for reliability and quality control in a collaborative assembly process. In this regard, key characteristics of assembly and process parameters of both human and robot have been identified, and their influence on assembly quality is determined. The parameters analyzed using correlation and regression modeling. Based on the analysis of data and results, a sensitivity analysis is done, and a control mechanism is formulated. The proposed approach has been applied to a collaborative assembly process of an industrial case to exemplify it, and promising results have been obtained.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122789801","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667223
B. Zia, Hafiz Sana Ullah Butt
Landing gear strut is one of the critical structural members of an aircraft which sustains impact loads during take-off, taxi and landing phase. So its strength characteristics and dynamic response play an important role in the overall functionality and performance of aircraft. This paper presents the dynamic response of a composite strut of landing gear against different impact velocities. For this purpose, a strut assembly was analyzed using ANSYS LSDYNA software. Velocities were imparted to strut through two lumped masses which represent the total weight of aircraft. The dynamic response of strut was determined in the form of acceleration "g's" at aircraft and a comparison was established among all load cases of impact velocities.
{"title":"Dynamic Response of a Composite Strut of Landing Gear of an Aircraft against Impact Velocity","authors":"B. Zia, Hafiz Sana Ullah Butt","doi":"10.1109/IBCAST.2019.8667223","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667223","url":null,"abstract":"Landing gear strut is one of the critical structural members of an aircraft which sustains impact loads during take-off, taxi and landing phase. So its strength characteristics and dynamic response play an important role in the overall functionality and performance of aircraft. This paper presents the dynamic response of a composite strut of landing gear against different impact velocities. For this purpose, a strut assembly was analyzed using ANSYS LSDYNA software. Velocities were imparted to strut through two lumped masses which represent the total weight of aircraft. The dynamic response of strut was determined in the form of acceleration \"g's\" at aircraft and a comparison was established among all load cases of impact velocities.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131831469","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 : 2019-01-01DOI: 10.1109/IBCAST.2019.8667184
Abdul Basit, S. Y. Nusenu, Shujhat Khan, Waqar Khan, M. A. Khan, M. U. Farooq
In array beamforming, main lobe steering towards intended position and null placement towards interferers’ positions are the main objectives. Unfortunately, if some array elements fail to work, the array beamforming performance is seriously deteriorated. Therefore, detection of faulty array element and correction of beampattern are two different issues but are very inter-linked tasks that need to be developed for efficient beamforming performance. In literature, these two tasks have been thoroughly investigated, separately. However, in this paper, we propose an adaptive closed-loop joint faulty element detection and beam pattern correction design. Moreover, we are considering frequency diverse array (FDA) with Bat algorithm (BA) based beamformer to detect the faulty elements first and, consequently, correct the beampattern to impose nulls in the interferences range-angle positions. The range-angle based pattern nulls are obtained by controlling the weights of the remaining array elements. The convergence performance of the FDA with Bat algorithm design has been compared with that of genetic algorithm (GA) and particle swarm optimization (PSO), while SINR performance of healthy and faulty arrays is compared for an interference dominant case.
{"title":"Adaptive Detection and Correction of Faulty Elements in Frequency Diverse Array","authors":"Abdul Basit, S. Y. Nusenu, Shujhat Khan, Waqar Khan, M. A. Khan, M. U. Farooq","doi":"10.1109/IBCAST.2019.8667184","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667184","url":null,"abstract":"In array beamforming, main lobe steering towards intended position and null placement towards interferers’ positions are the main objectives. Unfortunately, if some array elements fail to work, the array beamforming performance is seriously deteriorated. Therefore, detection of faulty array element and correction of beampattern are two different issues but are very inter-linked tasks that need to be developed for efficient beamforming performance. In literature, these two tasks have been thoroughly investigated, separately. However, in this paper, we propose an adaptive closed-loop joint faulty element detection and beam pattern correction design. Moreover, we are considering frequency diverse array (FDA) with Bat algorithm (BA) based beamformer to detect the faulty elements first and, consequently, correct the beampattern to impose nulls in the interferences range-angle positions. The range-angle based pattern nulls are obtained by controlling the weights of the remaining array elements. The convergence performance of the FDA with Bat algorithm design has been compared with that of genetic algorithm (GA) and particle swarm optimization (PSO), while SINR performance of healthy and faulty arrays is compared for an interference dominant case.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130167209","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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