2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)最新文献_第2页

Modeling the impact of ionosphere composition on GNSS signal in a diurnal cycle 模拟电离层组成对GNSS信号日周期的影响

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE) Pub Date : 2017-11-01 DOI: 10.1109/ICASE.2017.8374265

Umar Naeem, Zohaib Afzal

{"title":"Modeling the impact of ionosphere composition on GNSS signal in a diurnal cycle","authors":"Umar Naeem, Zohaib Afzal","doi":"10.1109/ICASE.2017.8374265","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374265","url":null,"abstract":"Ionospheric layer creates an abrupt change in the state of radio signals as they pass through plasma density irregularity produced by the solar radiations of the sun. These irregularities cause the signals from satellite to be affected by ions and free electrons, resulting in changing the speed and accuracy of pseudorange and carrier phase measurements as well as losing the signal altogether. The Ionospheric composition is separated into three fundamental layers largely known as D, E and F regions. Where D region is the result of a solar flow created 60 to 90 km over the earth's surface. As the degree of ionization depends fundamentally on the sun, this layer disappears at night due to the rearrangement of ions and electrons. Due to the ionization in D layer at day time, a large pseudorange delay is produced and an inaccuracy of up to several meters in the end user position is seen as a result. However, at night when there is no effect of solar radiations, these signals are observed to give a smaller pseudorange delay and fairly good results. In this research paper, we have observed the change in ionospheric delays over a 24 hour period. The data is collected after every 30 minutes throughout this duration and we apply the Klobuchar's ionospheric model to determine the time delay problem by utilizing the eight ionospheric coefficients obtained from the satellite navigation message. The authenticity of pseudorange delay calculation is proved by simulation in this paper.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115725565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A real-time smart dumpsters monitoring and garbage collection system 一种实时智能垃圾箱监控和垃圾收集系统

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE) Pub Date : 2017-11-01 DOI: 10.1109/ICASE.2017.8374268

U. Draz, Tariq Ali, J. Khan, Muhammad Majid, S. Yasin

{"title":"A real-time smart dumpsters monitoring and garbage collection system","authors":"U. Draz, Tariq Ali, J. Khan, Muhammad Majid, S. Yasin","doi":"10.1109/ICASE.2017.8374268","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374268","url":null,"abstract":"Now this is the modern era of technology where life is becoming simple and easier in all aspects of the advancement of technology. The new world is adopting automatic systems. In various areas of the city, the garbage dumpster is keep in different public places and along the roads where there are overflowing because of increasing wasting system and lack of monitoring. It creates an unhealthy environment and unpleasant conditions for the public also have bad aroma outside the environment. Therefore, many diseases spread around the environment that have dangerous for our health. So, it needs to investigate to solve the problem of overflow garbage dumpsters. In this paper, there are multiple dumpsters located across the city or the selected area. These dumpsters are deployed with a low cost embedded device like IoT based which helps in determining the status of the garbage, coverage area, and a GPS module is provided a location for every dumpster in the city. So that it is easy to determine which dumpster is full and where it is located. When the garbage level reaches the threshold limits, the IoT based device will transmit the level along with the GPS coordinates through SMS alert messages. These details can be accessed by the concern authorities from their place and an immediate action can be made to clean the dumpsters.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124871503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

Analysis of proportional damping or Rayleigh damping on damped and undamped systems 阻尼和无阻尼系统的比例阻尼或瑞利阻尼分析

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE) Pub Date : 2017-11-01 DOI: 10.1109/icase.2017.8374272

M. A. Saeed

{"title":"Analysis of proportional damping or Rayleigh damping on damped and undamped systems","authors":"M. A. Saeed","doi":"10.1109/icase.2017.8374272","DOIUrl":"https://doi.org/10.1109/icase.2017.8374272","url":null,"abstract":"Damping mechanisms have been active areas of research for a long time in history, despite this its understanding is still rudimentary as compared to the other traits of modeling. The actual problem is that even now it is not clear, which state variables are relevant for the computation of damping forces, which makes it very difficult to model in Finite Element Method. To remedy this, a well-known method is used, called ‘Proportional damping’ (Rayleigh damping) and used for the modeling of viscous damping, initially established for undamped systems, but can be used for the analysis of damped systems as well. Proportional damping is used to model the energy dissipation characteristics of complex engineering structures as well as solve multiple dynamic problems. It plays very important role in modeling damping on an industrial scale. So, Rayleigh damping is proved to be an effective way of considering damping for structure's analysis. To completely analyze the proportional damping, damping parameters are attained for two multiple degrees of freedom systems and Rayleigh damping parameters will be extracted for attained damping values during the research to demonstrate the theoretical approach of Proportional damping. The aim of this paper is to analyze Rayleigh damping or Proportional damping and have an overview of its effects and its importance in structures, along with explaining its advantages and disadvantages.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"15 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123515252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Soil moisture content estimation using GNSS reflectometry (GNSS-R) 基于GNSS反射法的土壤水分估算

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE) Pub Date : 2017-11-01 DOI: 10.1109/ICASE.2017.8374264

Jabir Shabbir Malik, Jingrui Zhang, N. A. Naqvi

{"title":"Soil moisture content estimation using GNSS reflectometry (GNSS-R)","authors":"Jabir Shabbir Malik, Jingrui Zhang, N. A. Naqvi","doi":"10.1109/ICASE.2017.8374264","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374264","url":null,"abstract":"Global Navigation Satellite System-Reflectometry (GNSS-R) is defined as a bistatic radar system. GNSS-R has a unique potential in microwave remote sensing application. The focus of this paper is the feasibility of estimating soil moisture content using GPS-L1 scattered or reflected signals from the earth's surface. GPS signals are received and processed using ground based platform at 4m height. In this paper soil moisture is estimated from the surface power reflectivity which is the power ratio of the reflected signal and the direct signal. Analytical solution for the dielectric constant is resolved. The dielectric constant is measured and the physically suitable value of soil dielectric constant is related with the semi-empirical model of a constant parameters. Soil moisture content is retrieved by exactly knowing the soil textural composition of sand S and clay C in percentage. To validate the results estimated soil moisture values are compared with the in-situ measurements. Finally for error analysis three statistical tools are used, absolute relative error, Root Mean Square Error (RMSE), and Root Mean Bias (RMB). The results demonstrate that soil moisture varies and changed significantly after rainfalls occurred. However, it is also observed that values are inconsistent at higher elevation angles in some cases.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133262974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Second order fading statistics of UAV networks 无人机网络的二阶衰落统计

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE) Pub Date : 2017-11-01 DOI: 10.1109/ICASE.2017.8374250

Furqan Jameel, Faisal, M. Haider, A. Butt

引用次数: 9

Design and performance evaluation of low cost, medium resolution imaging payload for nanosatellites 纳米卫星低成本、中分辨率成像载荷设计与性能评价

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE) Pub Date : 2017-11-01 DOI: 10.1109/ICASE.2017.8374285

S. M. A. Bashir, Ghulam Abbas Mughal, Rehan Mahmood, K. Khurshid

{"title":"Design and performance evaluation of low cost, medium resolution imaging payload for nanosatellites","authors":"S. M. A. Bashir, Ghulam Abbas Mughal, Rehan Mahmood, K. Khurshid","doi":"10.1109/ICASE.2017.8374285","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374285","url":null,"abstract":"The main objective of any onboard imaging system is to remotely take images of the region of interest from space. For high resolution images, large aperture size telescopes are used which require large satellite structures. In case of small satellites (especially Nanosatellites) low resolution acquisition systems are used to acquire imaging data. This paper discusses an imaging payload design specifically designed for Nanosatellites where there are constraints of size, weight, and power. Design of optics, selection of sensor, generic software flow diagram and overall design topology are discussed in this paper. Finally the designed payload is evaluated based on the power consumption, operational environment, spatial resolution and cost of development. Payload is made using industrial components hence the operational temperature is limited to −25°C to 70°C, this temperature limit is for internal temperature of the components. The standby power consumption is way under 10mW. The project is delivered in the form of a PCB of 9cm × 9cm along with the software platform for complete offline testing.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124497710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Comparative study on stability of input impedance and total gain of Side Fed Bifilar Helix Antenna 侧馈双线螺旋天线输入阻抗和总增益稳定性的比较研究

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE) Pub Date : 2017-11-01 DOI: 10.1109/ICASE.2017.8374282

Muhammad Ahmad, Taimoor Zahid, I. Din, M. Amin

{"title":"Comparative study on stability of input impedance and total gain of Side Fed Bifilar Helix Antenna","authors":"Muhammad Ahmad, Taimoor Zahid, I. Din, M. Amin","doi":"10.1109/ICASE.2017.8374282","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374282","url":null,"abstract":"This paper presents the study of comparison of input impedance and total gain of Side Fed Bifilar Helix Antenna (SFBHA) with the height variation (in terms of wavelength) from Perfect Electric Conducting ground plane (PEC) which is fixed in size. The simulated results show that a 10λ×10λ size metallic ground plane has reasonable accuracy approximating the infinite PEC ground plane. The input impedance and Voltage Standing Wave Ratio (VSWR) variations are noticeable between the heights of 0.05λ to 0.35λ both in actual measurements and simulations. The observed variations above the height of 0.35λ are negligibly small. The simulated results of input impedance and VSWR are very similar to measured results. The simulated results and the measured results show the total gain pattern of SFBHA remains stable by varying the height of SFBHA above PEC. In this paper the performance comparison shows that electromagnetic performance of SFBHA till 0.35λ is better than Horizontal Dipole antenna (HD), Vertical rectangular Loop antenna (VL) and also another orientation of rectangular loop antenna that is Horizontal and Perpendicular Loop (H&PL).","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132675721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estimation of velocity profiles of flow in a slot subjected to oscillating pressure gradient 受压力梯度振荡影响的槽内流动速度分布的估计

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE) Pub Date : 2017-11-01 DOI: 10.1109/ICASE.2017.8374255

K. Ahmed, Syed Irtiza Ali Shah

{"title":"Estimation of velocity profiles of flow in a slot subjected to oscillating pressure gradient","authors":"K. Ahmed, Syed Irtiza Ali Shah","doi":"10.1109/ICASE.2017.8374255","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374255","url":null,"abstract":"In this work velocity profiles have been calculated for a flow in a slot with a pressure gradient subjected to oscillations using a computer program. From previous work and findings, it is known that the flow in a slot with a constant pressure gradient has a velocity profile which forms a parabolic shape. In this work we add an vibratory component to the steady gradient under consideration. Moreover, the changes in velocities and changes in dimensional parameters of the slot has been analyzed. Graphs of velocity changes are captured for various time and slot stations in order to fully understand the flow when a pressure gradient of vibratory nature is applied. The Navier — Stokes and continuity equations in are used and are kept in the Cartesian coordinates. Changes in velocity profiles for various kinematic viscosity of the fluids are also taken into consideration. The establishment of the viscous region within the slot and its variation with respect to viscosity of the fluid is studied. Moreover, the variation in velocity profile with changing dimensions of the slot is also taken into consideration. The proposed algorithm formulated during the course of this research will enable and aid scientific investigators and academics to accomplish calculations to design various slots according to situational requirements. The results achieved will help in designing slots and channels which experience oscillation in pressure gradients and can also be used to predict the of nature of gradient at work.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130763970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Burgers' vortex model: Velocity profiles and vorticity distribution Burgers涡模型的分析:速度分布和涡度分布

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE) Pub Date : 2017-11-01 DOI: 10.1109/ICASE.2017.8374254

M. Jamil, Syed Irtiza Ali Shah

{"title":"Analysis of Burgers' vortex model: Velocity profiles and vorticity distribution","authors":"M. Jamil, Syed Irtiza Ali Shah","doi":"10.1109/ICASE.2017.8374254","DOIUrl":"https://doi.org/10.1109/ICASE.2017.8374254","url":null,"abstract":"Free vortices are observed in everyday life e.g. at sinks and bathtub drains. Till date, various studies have been made to analyze different analytical models on free surface vortices. The present work is designed to provide a better understanding on the phenomenon of vorticity and in the same context, Burgers' vortex model has been considered. Two main parameters of circulation and vortex core radius are defined. Mathematical models for velocity and vorticity have been analytically developed and the velocity profiles have been calculated utilizing computer aided codes. Vorticity and velocity plots have been generated for different combinations of viscosities and extensional strains; subsequently the effect of vortex stretching on vortex core radius is examined. Analysis revealed that most of the vorticity is distributed towards the vortex core while effect of strain rates and viscosity on the velocity profiles/vorticity distribution has also been critically analyzed. Analysis carried out in the current study will assist researchers to evaluate various free vortex models on same underlined principles. Subsequently, these models can be compared to assess the accuracy of each, validated with experimental results. Phenomenon discussed in the paper has significance in industry such as gravitation water vortex power plants, hydropower plants and Ranque-Hilsch refrigeration tubes. The vortex character also has implications in wildfires and tornadoes formation, nuclear power plants and flame stabilizers in combustion chambers of jet engines where undesirable effects of swirls have to be curtailed.","PeriodicalId":203936,"journal":{"name":"2017 Fifth International Conference on Aerospace Science & Engineering (ICASE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128449175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Model of planetary radar for tracking near-Earth asteroids 用于跟踪近地小行星的行星雷达模型

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE) Pub Date : 2017-11-01 DOI: 10.1109/icase.2017.8374262

Romissa Ali Mohammed, M. Alradi

引用次数: 0