Pub Date : 2021-12-14DOI: 10.1109/icase54940.2021.9904218
{"title":"ICASE 2021 Cover Page","authors":"","doi":"10.1109/icase54940.2021.9904218","DOIUrl":"https://doi.org/10.1109/icase54940.2021.9904218","url":null,"abstract":"","PeriodicalId":300328,"journal":{"name":"2021 Seventh International Conference on Aerospace Science and Engineering (ICASE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123394659","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 : 2021-12-14DOI: 10.1109/ICASE54940.2021.9904133
Syed Roshaan Ali Shah, Obaid-ur-Rehman, Rana Ahmad Faraz Ishaq, Y. Shabbir, Ijaz Ahmad
Agriculture field boundary information is vital in crop health monitoring, food security efforts, and precision agriculture. In countries like Denmark and the Netherlands field parcel information is available whereas Pakistan lacks such datasets.Denmark field boundary data for year 2018 was selected for the training of the model. Satellite imagery of four dates was downloaded and preprocessed to capture crop dynamics on the ground. Semantic segmentation architectures were used to train the models on the imagery, and results were assessed using metrics such as Intersection over Union(IoU) and f1-scores.The results show that UNet architecture with SENet154 backbone performs better than other architecture-backbone combinations. In terms of dates of imagery, data from 27th July achieved a higher IoU score. The method of providing input mask to the model had the most impact on the metrics and resulted in a 35% increase in IoU. Temporal stacking of multi-date satellite imagery proved to be an effective way of increasing information content for boundary delineation and improved the IoU by 6.5% in comparison to a single-date model. The final temporal stacked model had an IoU score of around 0.72.The trained model was able to delineate boundaries and showed good results in comparison to the available ground truth. The results of transfer learning to new areas suggest that there is potential in using such techniques, but further factors need to be considered to improve the metrics.
{"title":"Deep Learning on High Spatial and Temporal Cadence Satellite Imagery for Field Boundary Delineation","authors":"Syed Roshaan Ali Shah, Obaid-ur-Rehman, Rana Ahmad Faraz Ishaq, Y. Shabbir, Ijaz Ahmad","doi":"10.1109/ICASE54940.2021.9904133","DOIUrl":"https://doi.org/10.1109/ICASE54940.2021.9904133","url":null,"abstract":"Agriculture field boundary information is vital in crop health monitoring, food security efforts, and precision agriculture. In countries like Denmark and the Netherlands field parcel information is available whereas Pakistan lacks such datasets.Denmark field boundary data for year 2018 was selected for the training of the model. Satellite imagery of four dates was downloaded and preprocessed to capture crop dynamics on the ground. Semantic segmentation architectures were used to train the models on the imagery, and results were assessed using metrics such as Intersection over Union(IoU) and f1-scores.The results show that UNet architecture with SENet154 backbone performs better than other architecture-backbone combinations. In terms of dates of imagery, data from 27th July achieved a higher IoU score. The method of providing input mask to the model had the most impact on the metrics and resulted in a 35% increase in IoU. Temporal stacking of multi-date satellite imagery proved to be an effective way of increasing information content for boundary delineation and improved the IoU by 6.5% in comparison to a single-date model. The final temporal stacked model had an IoU score of around 0.72.The trained model was able to delineate boundaries and showed good results in comparison to the available ground truth. The results of transfer learning to new areas suggest that there is potential in using such techniques, but further factors need to be considered to improve the metrics.","PeriodicalId":300328,"journal":{"name":"2021 Seventh International Conference on Aerospace Science and Engineering (ICASE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124601722","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 : 2021-12-14DOI: 10.1109/ICASE54940.2021.9904269
Yusha Anis, Aamir Ali
In the last decade, climate change is prominently seen with rise in occurrence and severity of heat waves, especially in the province of Sindh, Pakistan. Heat waves have claimed thousands of lives and have resulted in major financial losses over the past years. The disaster is a combination of environmental mismanagement and meteorological disturbances. With an increase in frequency of heat wave events recorded in last five years, it is imminent that more losses are expected to occur. It is integral to develop heat wave identification techniques, monitor occurrence events, develop probabilistic models, and formulate risk reduction plans accordingly. This paper is an attempt to map occurrences and assess the impact severity of heat waves in the province of Sindh. Satellite derived daily temperature and humidity records are used to develop a historic database as input in the model. Moreover, it aims at defining a threshold to develop a Heat Index for the region. The index is to be used for defining the discomfort level experienced by people at different heat wave intensities. The study incorporates this heat index to map heat wave hazard, over period from 2000–2019. Several heat wave records are obtained through the algorithm and combined to develop a heat wave hazard map. The study would be beneficial for disaster management agencies and planning departments in coping with the future heat wave hazards and risk reduction.
{"title":"Developing Heat Index for Heat Wave Hazard Mapping: A Case Study of Sindh Province, Pakistan","authors":"Yusha Anis, Aamir Ali","doi":"10.1109/ICASE54940.2021.9904269","DOIUrl":"https://doi.org/10.1109/ICASE54940.2021.9904269","url":null,"abstract":"In the last decade, climate change is prominently seen with rise in occurrence and severity of heat waves, especially in the province of Sindh, Pakistan. Heat waves have claimed thousands of lives and have resulted in major financial losses over the past years. The disaster is a combination of environmental mismanagement and meteorological disturbances. With an increase in frequency of heat wave events recorded in last five years, it is imminent that more losses are expected to occur. It is integral to develop heat wave identification techniques, monitor occurrence events, develop probabilistic models, and formulate risk reduction plans accordingly. This paper is an attempt to map occurrences and assess the impact severity of heat waves in the province of Sindh. Satellite derived daily temperature and humidity records are used to develop a historic database as input in the model. Moreover, it aims at defining a threshold to develop a Heat Index for the region. The index is to be used for defining the discomfort level experienced by people at different heat wave intensities. The study incorporates this heat index to map heat wave hazard, over period from 2000–2019. Several heat wave records are obtained through the algorithm and combined to develop a heat wave hazard map. The study would be beneficial for disaster management agencies and planning departments in coping with the future heat wave hazards and risk reduction.","PeriodicalId":300328,"journal":{"name":"2021 Seventh International Conference on Aerospace Science and Engineering (ICASE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120982522","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 : 2021-12-14DOI: 10.1109/ICASE54940.2021.9904249
Afaq Ahmed, Areeb Aamir, Tabish Raza, Muhammad H.D. Khan
Healthcare supply chain refers to the process of procurement and distribution of medicines and other healthcare products as they move from the manufacturing plant to the patient. This is a very complex and distributed process that comes with a set of challenges like scalability, synchronization and trust between the involved parties. The increase in adoption of Radio-frequency Identification (RFID) based systems in the healthcare supply chain shows that RFID technology is a very promising technique for traceability, identification and communication. However, these RFID systems still face issues of privacy and security which need to be addressed to get their full benefit. In this research work, we have integrated RFID systems belonging to the Healthcare supply chain with secure decentralized storage such as Blockchain. Blockchains provides a secure and transparent decentralized mechanism that is used to keep track of all transactions. It offers a new kind of implementation focused on trust, transparency, and accountability. Information about the RFID enabled medicines and other Healthcare products can be added to our proposed framework via a blockchain-based decentralized application (Dapp). The proposed system is based on an Ethereum node, and this information can be stored in a Blockchain using multi-stage interfaces provided by the Smart Contract. Our proposed system has been deployed both on an offline and online environment, and it offers many advantages like monitoring and tracing of medicine through the Blockchain network, determining if the medicine is genuine or counterfeit, and reducing the number of counterfeit and unapproved medicine entering the Healthcare system. Based on simulation results, the proposed framework successfully provides the needed security and privacy required for the healthcare supply chain.
{"title":"Blockchain Based RFID Prototype For Medicine Traceability along the Healthcare Supply Chain","authors":"Afaq Ahmed, Areeb Aamir, Tabish Raza, Muhammad H.D. Khan","doi":"10.1109/ICASE54940.2021.9904249","DOIUrl":"https://doi.org/10.1109/ICASE54940.2021.9904249","url":null,"abstract":"Healthcare supply chain refers to the process of procurement and distribution of medicines and other healthcare products as they move from the manufacturing plant to the patient. This is a very complex and distributed process that comes with a set of challenges like scalability, synchronization and trust between the involved parties. The increase in adoption of Radio-frequency Identification (RFID) based systems in the healthcare supply chain shows that RFID technology is a very promising technique for traceability, identification and communication. However, these RFID systems still face issues of privacy and security which need to be addressed to get their full benefit. In this research work, we have integrated RFID systems belonging to the Healthcare supply chain with secure decentralized storage such as Blockchain. Blockchains provides a secure and transparent decentralized mechanism that is used to keep track of all transactions. It offers a new kind of implementation focused on trust, transparency, and accountability. Information about the RFID enabled medicines and other Healthcare products can be added to our proposed framework via a blockchain-based decentralized application (Dapp). The proposed system is based on an Ethereum node, and this information can be stored in a Blockchain using multi-stage interfaces provided by the Smart Contract. Our proposed system has been deployed both on an offline and online environment, and it offers many advantages like monitoring and tracing of medicine through the Blockchain network, determining if the medicine is genuine or counterfeit, and reducing the number of counterfeit and unapproved medicine entering the Healthcare system. Based on simulation results, the proposed framework successfully provides the needed security and privacy required for the healthcare supply chain.","PeriodicalId":300328,"journal":{"name":"2021 Seventh International Conference on Aerospace Science and Engineering (ICASE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116189249","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 : 2021-12-14DOI: 10.1109/ICASE54940.2021.9904234
Muhammad S. Anjum, L. Chen, M. Gu
The blazars are the brightest astrophysical objects in the extragalactic gamma-ray sky and divided into two main classes, Flat Spectrum Radio Quasars (FSRQs) and BL Lac objects (BLs). Blazars emit radiation via non-thermal processes including synchrotron and inverse Compton (IC), and their multiband spectra are peaked and highly curved. We find that FSRQs show higher curvature than BLs, that might be due to complex radiation mechanisms. We investigate the relationship between spectral parameters of BLs to investigate the signatures of particle acceleration and cooling in plasma jets of blazars. The synchrotron peak frequency of BLs is correlated with the spectral curvature, that is a signature of stochastic particle acceleration. The synchrotron peak frequency also shows an inverse correlation with gamma-ray luminosity and the Compton dominance, that is a signature of blazar sequence. We, therefore, suggest that the synchrotron peak frequency in BLs is dominated by radiative cooling and arises due to a cooling break, whereas the curvature might arise due to a stochastic particle acceleration mechanism.
{"title":"The Spectral Parameters of Gamma-Ray Blazars","authors":"Muhammad S. Anjum, L. Chen, M. Gu","doi":"10.1109/ICASE54940.2021.9904234","DOIUrl":"https://doi.org/10.1109/ICASE54940.2021.9904234","url":null,"abstract":"The blazars are the brightest astrophysical objects in the extragalactic gamma-ray sky and divided into two main classes, Flat Spectrum Radio Quasars (FSRQs) and BL Lac objects (BLs). Blazars emit radiation via non-thermal processes including synchrotron and inverse Compton (IC), and their multiband spectra are peaked and highly curved. We find that FSRQs show higher curvature than BLs, that might be due to complex radiation mechanisms. We investigate the relationship between spectral parameters of BLs to investigate the signatures of particle acceleration and cooling in plasma jets of blazars. The synchrotron peak frequency of BLs is correlated with the spectral curvature, that is a signature of stochastic particle acceleration. The synchrotron peak frequency also shows an inverse correlation with gamma-ray luminosity and the Compton dominance, that is a signature of blazar sequence. We, therefore, suggest that the synchrotron peak frequency in BLs is dominated by radiative cooling and arises due to a cooling break, whereas the curvature might arise due to a stochastic particle acceleration mechanism.","PeriodicalId":300328,"journal":{"name":"2021 Seventh International Conference on Aerospace Science and Engineering (ICASE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123561309","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 : 2021-12-14DOI: 10.1109/ICASE54940.2021.9904264
Faiza Sajjad, Muhammad Ihtisham Babar, Muneeb Ahsan
In this article, a higher-order panel code is used to study the effects of the vertical and horizontal location of the canard as well as its dihedral on the lift of a closely-coupled wing-canard configuration. PanAir is a higher-order potential code which solves Prandtl-Glauert equation in subsonic and supersonic regimes by distributing source and doublet singularities over a finite number of panels of a geometry. The available panel code is the pilot version of PanAir, which is capable of evaluating aerodynamic coefficients for complex geometries. Being a potential flow code, PanAir does not take into account the viscous aspect of the flow but gives quick and reasonable results for arbitrary configurations. To investigate the effect of location of canard, three horizontal and vertical positions are considered based on the maximum thickness of canard. Later, the effect of dihedral is studied using one value of canard dihedral and a corresponding value of anhedral. It is concluded that the addition of a canard in plane of the wing decreases the lift while moving it towards the wing increases the lift. Shifting the canard above the wing plane also adds to the lift of the aircraft. The effect of dihedral and anhedral on lift is highly dependent on the vertical and horizontal location of canard.
{"title":"PanAir Study of Variation in Canard Location and Dihedral on Lift Characteristics of a Close-Coupled Wing-Canard Configuration","authors":"Faiza Sajjad, Muhammad Ihtisham Babar, Muneeb Ahsan","doi":"10.1109/ICASE54940.2021.9904264","DOIUrl":"https://doi.org/10.1109/ICASE54940.2021.9904264","url":null,"abstract":"In this article, a higher-order panel code is used to study the effects of the vertical and horizontal location of the canard as well as its dihedral on the lift of a closely-coupled wing-canard configuration. PanAir is a higher-order potential code which solves Prandtl-Glauert equation in subsonic and supersonic regimes by distributing source and doublet singularities over a finite number of panels of a geometry. The available panel code is the pilot version of PanAir, which is capable of evaluating aerodynamic coefficients for complex geometries. Being a potential flow code, PanAir does not take into account the viscous aspect of the flow but gives quick and reasonable results for arbitrary configurations. To investigate the effect of location of canard, three horizontal and vertical positions are considered based on the maximum thickness of canard. Later, the effect of dihedral is studied using one value of canard dihedral and a corresponding value of anhedral. It is concluded that the addition of a canard in plane of the wing decreases the lift while moving it towards the wing increases the lift. Shifting the canard above the wing plane also adds to the lift of the aircraft. The effect of dihedral and anhedral on lift is highly dependent on the vertical and horizontal location of canard.","PeriodicalId":300328,"journal":{"name":"2021 Seventh International Conference on Aerospace Science and Engineering (ICASE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132474438","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 : 2021-12-14DOI: 10.1109/ICASE54940.2021.9904292
Tech Hamza Ahmad Malik, Khurram Baig, Khizar Ahmad Baqai, Ilyas Mehmood Qureshi, Shoaib Randhawa, Wajeeh Hassan
The decline in the research of seaplanes started after 1950, when the focus shifted towards improving the infrastructure of land-based aircrafts. Existing designs with minor improvements are being used since then. The goal is to critically discuss the parameters one by one based on which a specific design configuration of a seaplane is evaluated in this paper. Trimaran based configuration is based on a blend of float plane and flying boat. It has lower aerodynamic drag once airborne. The hydrostatic stability is achieved by the restoring moment generated by the interaction between cg and mc height. They have superior stability achieved by the restoring moment generated by the interaction between center of gravity and meta center height.
{"title":"Review on Advance Seaplane Conceptual Design Adapting Trimaran Boat Hull Concept","authors":"Tech Hamza Ahmad Malik, Khurram Baig, Khizar Ahmad Baqai, Ilyas Mehmood Qureshi, Shoaib Randhawa, Wajeeh Hassan","doi":"10.1109/ICASE54940.2021.9904292","DOIUrl":"https://doi.org/10.1109/ICASE54940.2021.9904292","url":null,"abstract":"The decline in the research of seaplanes started after 1950, when the focus shifted towards improving the infrastructure of land-based aircrafts. Existing designs with minor improvements are being used since then. The goal is to critically discuss the parameters one by one based on which a specific design configuration of a seaplane is evaluated in this paper. Trimaran based configuration is based on a blend of float plane and flying boat. It has lower aerodynamic drag once airborne. The hydrostatic stability is achieved by the restoring moment generated by the interaction between cg and mc height. They have superior stability achieved by the restoring moment generated by the interaction between center of gravity and meta center height.","PeriodicalId":300328,"journal":{"name":"2021 Seventh International Conference on Aerospace Science and Engineering (ICASE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128027973","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 : 2021-12-14DOI: 10.1109/ICASE54940.2021.9904148
Hina Magsi, A. Hussain, Arslan Ahmed, Sonia, F. Chachar, Faiza
The amplitude and phase of the trans-ionospheric radio frequency (RF) signals can be influenced by the existence of electron density irregularities in the ionosphere. These irregularities may give rise to ionospheric scintillation phenomena which is characterized by rapid amplitude and phase variations in the received signals. The occurrence and severity of ionospheric scintillation is highly dependent on the geomagnetic storm, solar activity, time of the day and geographic location of the receiver and thus, poses a significant threat to the availability and accuracy of satellite-based navigation systems. This paper presents a detailed study on ionospheric scintillation using the Chinese BeiDou navigation system at the verge of low and mid latitude (Sukkur, Pakistan: Latitude 27.73° N, Longitude 68.82° 8 E). The variations and occurrence patterns of scintillation are studied in detail using BeiDou raw data for the year 2020. The diurnal, monthly, and seasonal variations were investigated during geomagnetic quiet and disturbed days. The result of this study shows that amplitude scintillation is most probable to arise at this region (Pakistan) as compared to phase scintillation. The detailed analysis of scintillation occurrence patterns indicates that scintillation is found to be more active in winter season with maximum scintillation events (S4 > 0.3) in the month of March. This initial study on occurrences of scintillation over Pakistan can be beneficial for better understanding the scintillation trends over Pakistan and can pave the way for conducting long term studies.
{"title":"Investigation of Ionospheric Scintillation using BeiDou during Geomagnetic and Non-geomagnetic Storm Conditions Over Pakistan","authors":"Hina Magsi, A. Hussain, Arslan Ahmed, Sonia, F. Chachar, Faiza","doi":"10.1109/ICASE54940.2021.9904148","DOIUrl":"https://doi.org/10.1109/ICASE54940.2021.9904148","url":null,"abstract":"The amplitude and phase of the trans-ionospheric radio frequency (RF) signals can be influenced by the existence of electron density irregularities in the ionosphere. These irregularities may give rise to ionospheric scintillation phenomena which is characterized by rapid amplitude and phase variations in the received signals. The occurrence and severity of ionospheric scintillation is highly dependent on the geomagnetic storm, solar activity, time of the day and geographic location of the receiver and thus, poses a significant threat to the availability and accuracy of satellite-based navigation systems. This paper presents a detailed study on ionospheric scintillation using the Chinese BeiDou navigation system at the verge of low and mid latitude (Sukkur, Pakistan: Latitude 27.73° N, Longitude 68.82° 8 E). The variations and occurrence patterns of scintillation are studied in detail using BeiDou raw data for the year 2020. The diurnal, monthly, and seasonal variations were investigated during geomagnetic quiet and disturbed days. The result of this study shows that amplitude scintillation is most probable to arise at this region (Pakistan) as compared to phase scintillation. The detailed analysis of scintillation occurrence patterns indicates that scintillation is found to be more active in winter season with maximum scintillation events (S4 > 0.3) in the month of March. This initial study on occurrences of scintillation over Pakistan can be beneficial for better understanding the scintillation trends over Pakistan and can pave the way for conducting long term studies.","PeriodicalId":300328,"journal":{"name":"2021 Seventh International Conference on Aerospace Science and Engineering (ICASE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117102907","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 : 2021-12-14DOI: 10.1109/ICASE54940.2021.9904233
S. R. U. N. Jafri, Sheraz Shamim, Osama Khan, Syed Ahsan Raza, Hammad Zahid, Muhammad Ahmar Wadood, Talha Zia
This paper presents a vehicle based custom-made urban mobile scanning and mapping system for surveying outdoor environments. The system is equipped with multiple low-range 2D Hokuyo laser scanners mounted in different orientations in order to perceive the environment. Additionally, a global positioning system, inertial measurement unit and camera have been integrated with the system to record pose and visual information. The system has been tested inside the campus and outside the region adjacent to the campus. Comprehensive and accurate mapping results have been found and presented in the paper. Further analysis on the developed map for assessment of the road furniture like electric poles, vegetation and signboard is possible comfortably. Therefore the system can be very helpful for concerned public and private entities to do renovation, construction and extension in existing urban structures. Moreover the system is economical and faster than the available local urban surveying systems with greater efficiency.
{"title":"Campus Terrain Surveying and Mapping using Low Range 2D Laser Scanners","authors":"S. R. U. N. Jafri, Sheraz Shamim, Osama Khan, Syed Ahsan Raza, Hammad Zahid, Muhammad Ahmar Wadood, Talha Zia","doi":"10.1109/ICASE54940.2021.9904233","DOIUrl":"https://doi.org/10.1109/ICASE54940.2021.9904233","url":null,"abstract":"This paper presents a vehicle based custom-made urban mobile scanning and mapping system for surveying outdoor environments. The system is equipped with multiple low-range 2D Hokuyo laser scanners mounted in different orientations in order to perceive the environment. Additionally, a global positioning system, inertial measurement unit and camera have been integrated with the system to record pose and visual information. The system has been tested inside the campus and outside the region adjacent to the campus. Comprehensive and accurate mapping results have been found and presented in the paper. Further analysis on the developed map for assessment of the road furniture like electric poles, vegetation and signboard is possible comfortably. Therefore the system can be very helpful for concerned public and private entities to do renovation, construction and extension in existing urban structures. Moreover the system is economical and faster than the available local urban surveying systems with greater efficiency.","PeriodicalId":300328,"journal":{"name":"2021 Seventh International Conference on Aerospace Science and Engineering (ICASE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115085483","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 : 2021-12-14DOI: 10.1109/ICASE54940.2021.9904164
I. Mehmood, A. Qureshi, Muhammad Muaz, Channa Babar Ali
In this paper, design analysis of an X-band Vivaldi antenna array for airborne active phased array radar application has been presented. Initially, a parametric study has been conducted to find out the relationship between design characteristics of a Vivaldi antenna array and its performance. Thereafter, a single Vivaldi antenna leading to 1×8 uniform linear array was designed to achieve optimal performance before proceeding to 8×8 antenna array design. Moreover, the tuning and optimization of designed antenna array have also been performed to achieve the desired results. The transition from stripline to slotline in the feeding section was adopted to adhere to the size restrictions of airborne radar system. The designed antenna array operates in X-Band with a center frequency of 10 GHz. It comprises an array of 64-elements (8×8) and achieves a 22 dB gain. The return loss (S11) is better than −10 dB in 2 GHz bandwidth (8.55 – 10.75 GHz). With a transmitted peak power of 640 W, the Azimuth and Elevation coverage is ±60° and beamwidth is 13°. The isolation between two elements is 20 dB and Side Lobe Levels (SLL) are −30 dBc. The designed single-element Vivaldi antenna and uniform linear 1×8 elements Vivaldi array antenna have been fabricated to develop 8×8 elements antenna array. The return loss parameter and radiation patterns of all prototypes have been found in good agreement with simulation results. Rogers 5880 substrate with 1.57 mm thickness has been utilized for fabrication. The design and simulations analysis have been performed in ANSYS HFSS EM simulation platform and Gerber files have been generated through ADS for fabrication.
{"title":"Design and Development of a Vivaldi Antenna Array for Airborne X-Band Applications","authors":"I. Mehmood, A. Qureshi, Muhammad Muaz, Channa Babar Ali","doi":"10.1109/ICASE54940.2021.9904164","DOIUrl":"https://doi.org/10.1109/ICASE54940.2021.9904164","url":null,"abstract":"In this paper, design analysis of an X-band Vivaldi antenna array for airborne active phased array radar application has been presented. Initially, a parametric study has been conducted to find out the relationship between design characteristics of a Vivaldi antenna array and its performance. Thereafter, a single Vivaldi antenna leading to 1×8 uniform linear array was designed to achieve optimal performance before proceeding to 8×8 antenna array design. Moreover, the tuning and optimization of designed antenna array have also been performed to achieve the desired results. The transition from stripline to slotline in the feeding section was adopted to adhere to the size restrictions of airborne radar system. The designed antenna array operates in X-Band with a center frequency of 10 GHz. It comprises an array of 64-elements (8×8) and achieves a 22 dB gain. The return loss (S11) is better than −10 dB in 2 GHz bandwidth (8.55 – 10.75 GHz). With a transmitted peak power of 640 W, the Azimuth and Elevation coverage is ±60° and beamwidth is 13°. The isolation between two elements is 20 dB and Side Lobe Levels (SLL) are −30 dBc. The designed single-element Vivaldi antenna and uniform linear 1×8 elements Vivaldi array antenna have been fabricated to develop 8×8 elements antenna array. The return loss parameter and radiation patterns of all prototypes have been found in good agreement with simulation results. Rogers 5880 substrate with 1.57 mm thickness has been utilized for fabrication. The design and simulations analysis have been performed in ANSYS HFSS EM simulation platform and Gerber files have been generated through ADS for fabrication.","PeriodicalId":300328,"journal":{"name":"2021 Seventh International Conference on Aerospace Science and Engineering (ICASE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115086468","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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