Pub Date : 2020-09-11DOI: 10.3846/aviation.2020.13045
Laurynas Mačiulis, R. Belevičius
Steady-case thermal analysis plays an important role in dimensioning thermal control systems for spacecrafts and aircrafts. Usually a trial and error approach is used based on engineering judgement and experience. When thermal models become complex or there are conflicting thermal requirements, however, it becomes harder for an engineer to gain insight as to which design decisions will lead to better results. Numerical optimization, on the other hand, could provide a more robust approach for the thermal design of complex spacecraft or aircraft models. In this paper, we suggest a gradientbased multidisciplinary optimization of thermal models where the coupled derivatives of the multidisciplinary system are obtained with the adjoint method. We show that in the case of steady-state thermal analysis, there is an analytic solution of a partial derivatives of implicit heat-transfer equation that can be used to derive total derivatives of the system. We present a practical application of this method by solving a small interplanetary spacecraft thermal optimization problem consisting of one objective, 15 design variables, and 10 constraints. We found that by using gradient-based optimization with exact derivatives, the best results can be achieved by exploring the design space at multiple initial starting points without major computational overhead.
{"title":"GRADIENT-BASED OPTIMIZATION OF SPACECRAFT AND AIRCRAFT THERMAL DESIGN","authors":"Laurynas Mačiulis, R. Belevičius","doi":"10.3846/aviation.2020.13045","DOIUrl":"https://doi.org/10.3846/aviation.2020.13045","url":null,"abstract":"Steady-case thermal analysis plays an important role in dimensioning thermal control systems for spacecrafts and aircrafts. Usually a trial and error approach is used based on engineering judgement and experience. When thermal models become complex or there are conflicting thermal requirements, however, it becomes harder for an engineer to gain insight as to which design decisions will lead to better results. Numerical optimization, on the other hand, could provide a more robust approach for the thermal design of complex spacecraft or aircraft models. In this paper, we suggest a gradientbased multidisciplinary optimization of thermal models where the coupled derivatives of the multidisciplinary system are obtained with the adjoint method. We show that in the case of steady-state thermal analysis, there is an analytic solution of a partial derivatives of implicit heat-transfer equation that can be used to derive total derivatives of the system. We present a practical application of this method by solving a small interplanetary spacecraft thermal optimization problem consisting of one objective, 15 design variables, and 10 constraints. We found that by using gradient-based optimization with exact derivatives, the best results can be achieved by exploring the design space at multiple initial starting points without major computational overhead.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"105-116"},"PeriodicalIF":1.0,"publicationDate":"2020-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47678654","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 : 2020-09-10DOI: 10.3846/aviation.2020.12086
Ł. Orman
The paper considers the application of metal – fibrous microstructures in the development of highly efficient heat exchangers. Such structures can be successfully used in air conditioning systems of modern planes or in heat pipes located in planes and spacecraft. Copper fibers of 50 mm diameter have been used to produce coatings of different volumetric porosity. The sintering process was used to produce the samples. Pool boiling heat transfer tests have been performed on the non – isothermal surfaces of the fin with distilled water and ethyl alcohol (99.8% purity) as boiling agents. A significant enhancement of heat transfer has been recorded with the use of the metal – fibrous microstructures in comparison to the smooth surface without any coating. The enhancement proved to vary considerably depending on the superheat value.
{"title":"ASPECTS OF COMPLEXITY OF METAL-FIBROUS MICROSTRUCTURE FOR THE CONSTRUCTION OF HIGH-PERFORMANCE HEAT EXCHANGERS: THERMAL PROPERTIES","authors":"Ł. Orman","doi":"10.3846/aviation.2020.12086","DOIUrl":"https://doi.org/10.3846/aviation.2020.12086","url":null,"abstract":"The paper considers the application of metal – fibrous microstructures in the development of highly efficient heat exchangers. Such structures can be successfully used in air conditioning systems of modern planes or in heat pipes located in planes and spacecraft. Copper fibers of 50 mm diameter have been used to produce coatings of different volumetric porosity. The sintering process was used to produce the samples. Pool boiling heat transfer tests have been performed on the non – isothermal surfaces of the fin with distilled water and ethyl alcohol (99.8% purity) as boiling agents. A significant enhancement of heat transfer has been recorded with the use of the metal – fibrous microstructures in comparison to the smooth surface without any coating. The enhancement proved to vary considerably depending on the superheat value.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"99-104"},"PeriodicalIF":1.0,"publicationDate":"2020-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45553448","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 : 2020-08-27DOI: 10.3846/aviation.2020.12051
A. Kazda, M. Turiak, K. Gotz
This paper proposes a new airport typology that might arise from the expansion of airports with dominant low cost carrier traffic. In the first part of the paper, the typologies and different airport categorizations are reviewed with examples of current taxonomies used by principal international organizations. However, none of the current airport taxonomies takes into account low cost (LCC) carriers and cannot be used to create an airport market strategy with LCC operation. The paper highlights the characteristic of LCC features, the differences between the LCC airlines, and the characteristics of secondary – low cost airports. Finally, the paper proposes a new taxonomy of airports with low cost operations based on the airport data analysis and expert panel elucidation. For identification of airports with a high share of low cost carriers, Eurocontrol 2013 data on airline types and movements were used. The novel classification of low cost airports enables management to design marketing strategies to respond to LCC dominance and its implications. The main contribution of this research is to provide a novel classification for low cost airports which is relatively new phenomenon comparing with the problems of full service carriers dominance at large airports.
{"title":"AIRPORT TYPOLOGY FOR LCC POLICY CHANGES: A EUROPEAN PERSPECTIVE","authors":"A. Kazda, M. Turiak, K. Gotz","doi":"10.3846/aviation.2020.12051","DOIUrl":"https://doi.org/10.3846/aviation.2020.12051","url":null,"abstract":"This paper proposes a new airport typology that might arise from the expansion of airports with dominant low cost carrier traffic. In the first part of the paper, the typologies and different airport categorizations are reviewed with examples of current taxonomies used by principal international organizations. However, none of the current airport taxonomies takes into account low cost (LCC) carriers and cannot be used to create an airport market strategy with LCC operation. The paper highlights the characteristic of LCC features, the differences between the LCC airlines, and the characteristics of secondary – low cost airports. Finally, the paper proposes a new taxonomy of airports with low cost operations based on the airport data analysis and expert panel elucidation. For identification of airports with a high share of low cost carriers, Eurocontrol 2013 data on airline types and movements were used. The novel classification of low cost airports enables management to design marketing strategies to respond to LCC dominance and its implications. The main contribution of this research is to provide a novel classification for low cost airports which is relatively new phenomenon comparing with the problems of full service carriers dominance at large airports.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"90-98"},"PeriodicalIF":1.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47416350","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 : 2020-07-08DOI: 10.3846/aviation.2020.12424
Man Nguyen, V. Kostiukov, C. Tran
An issue of improving flight safety during landing with an inertial navigation system (INS) and a failed barometric altimeter is considered. In this paper, we propose a specific algorithm for in-flight calibration of the vertical channel of INS. Accordingly, the baro-inertial integration algorithm using a discrete five-state Kalman filter will be performed during a particular flight maneuver before landing. As a result, it is possible to estimate not only the bias of vertical accelerometer but also its scale factor, which is too small to be defined by a usual in-flight calibration algorithm. After applying the proposed algorithm, the flight management system can provide a safe landing with a standalone INS. The algorithm’s performance is assessed by simulating complete mathematical models of aircraft motion and control systems. The impact of calibrated bias and scale factor of vertical accelerometer on the altitude estimation error is provided through an analysis.
{"title":"EFFECT OF AN IN-FLIGHT VERTICAL ACCELEROMETER CALIBRATION ON LANDING ACCURACY AFTER BARO-INERTIAL SYSTEM FAILURE","authors":"Man Nguyen, V. Kostiukov, C. Tran","doi":"10.3846/aviation.2020.12424","DOIUrl":"https://doi.org/10.3846/aviation.2020.12424","url":null,"abstract":"An issue of improving flight safety during landing with an inertial navigation system (INS) and a failed barometric \u0000 altimeter is considered. In this paper, we propose a specific algorithm for in-flight calibration of the vertical channel of INS. Accordingly,\u0000 the baro-inertial integration algorithm using a discrete five-state Kalman filter will be performed during a particular flight maneuver before \u0000 landing. As a result, it is possible to estimate not only the bias of vertical accelerometer but also its scale factor, which is too small to be \u0000 defined by a usual in-flight calibration algorithm. After applying the proposed algorithm, the flight management system can provide a safe landing \u0000 with a standalone INS. The algorithm’s performance is assessed by simulating complete mathematical models of aircraft motion and control systems. \u0000 The impact of calibrated bias and scale factor of vertical accelerometer on the altitude estimation error is provided through an analysis.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45215438","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 : 2020-07-08DOI: 10.3846/aviation.2020.13110
G. Bureika
Special edition of "Aviation". Aviation, 24(2), p. 50
《航空》特别版。航空，24(2)，第50页
{"title":"SPECIAL EDITION OF \"AVIATION\"","authors":"G. Bureika","doi":"10.3846/aviation.2020.13110","DOIUrl":"https://doi.org/10.3846/aviation.2020.13110","url":null,"abstract":"Special edition of \"Aviation\". Aviation, 24(2), p. 50","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"50-50"},"PeriodicalIF":1.0,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43753161","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 : 2020-07-08DOI: 10.3846/aviation.2020.12144
M. Adamski
Analysis of contemporary armed conflicts shows that UCAV (Unmanned Combat Air Vehicle) is finding an increasing range of combat applications. The present study deals with constructional characteristics, tactical and technical parameters, equipment with reconnaissance sensors, electronic warfare equipment, weaponry, economic coefficient, combat experience, possessed additional benefits, systems and technologies, performance and application options in combat operations. Two UCAV (MALE − Medium Altitude Long Endurance) classes were analyzed based on Heron, Heron TP, MQ-1B Predator, MQ-1C Gray Eagle, Wing Loong, CH-4B and newly introduced MQ-9 Reaper ER, MQ-9 Reaper, P.1HH HammerHead, Mantis and (HALE − High Altitude Long Endurance) Global Yabhon, Yabhon-United 40 to determine their optimal effectiveness in combat operations. The article presents a general methodology for assessing the tactical effectiveness of selected UAV classes that are or can be used in modern armed conflicts. It can be useful for potential interested parties when making decisions regarding the purchase or application of an appropriate UAV depending on the capabilities and conditions of the defense strategy of a given country.
对当代武装冲突的分析表明，无人作战飞行器在作战中的应用范围越来越广。本研究涉及结构特点、战术技术参数、带侦察传感器的设备、电子战设备、武器装备、经济系数、作战经验、附加效益、系统和技术、性能以及在作战行动中的应用选择。基于苍鹭、苍鹭TP、MQ-1B捕食者、MQ-1C灰鹰、翼龙、CH-4B和新引入的MQ-9收割者ER、MQ-9收割器、P.1HH锤头、螳螂和（HALE−高空长航时）Global Yabhon、Yabhon United 40，分析了两种UCAV（MALE−中高度长航时。本文提出了一种通用方法，用于评估在现代武装冲突中使用或可以使用的选定无人机类别的战术效能。根据特定国家国防战略的能力和条件，在决定购买或应用适当的无人机时，这对潜在的利益相关方可能很有用。
{"title":"EFFECTIVENESS ANALYSIS OF UCAV USED IN MODERN MILITARY CONFLICTS","authors":"M. Adamski","doi":"10.3846/aviation.2020.12144","DOIUrl":"https://doi.org/10.3846/aviation.2020.12144","url":null,"abstract":"Analysis of contemporary armed conflicts shows that UCAV (Unmanned Combat Air Vehicle) is finding an increasing range of combat applications. The present study deals with constructional characteristics, tactical and technical parameters, equipment with reconnaissance sensors, electronic warfare equipment, weaponry, economic coefficient, combat experience, possessed additional benefits, systems and technologies, performance and application options in combat operations. Two UCAV (MALE − Medium Altitude Long Endurance) classes were analyzed based on Heron, Heron TP, MQ-1B Predator, MQ-1C Gray Eagle, Wing Loong, CH-4B and newly introduced MQ-9 Reaper ER, MQ-9 Reaper, P.1HH HammerHead, Mantis and (HALE − High Altitude Long Endurance) Global Yabhon, Yabhon-United 40 to determine their optimal effectiveness in combat operations. The article presents a general methodology for assessing the tactical effectiveness of selected UAV classes that are or can be used in modern armed conflicts. It can be useful for potential interested parties when making decisions regarding the purchase or application of an appropriate UAV depending on the capabilities and conditions of the defense strategy of a given country.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"66-71"},"PeriodicalIF":1.0,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48240748","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 : 2020-07-08DOI: 10.3846/aviation.2020.12375
Jevgēnijs Tereščenko, Аleksandrs Bitins, V. Shestakov, R. Chatys, Juris Maklakov
At the heart of airline flight safety management is a systematic approach to identifying hazards and controlling risk factors, which ICAO requires to collect, analyze all deviations in the activities of units, services and personnel airlines and use of its results to develop and implement management activities. That kind of the system enables the organization to predict and fix problems before they lead to an aviation accident. Thus, the organizational management structure should ensure high efficiency, reliability and completeness of the control over all components that ensure the process of the air transportation: the course of transportation, the clear operation of all units in the uninterrupted transport process and their correct matching. In modern conditions, this result is achieved based on a process approach, when the company’s activities are presented as a set of production processes (activities). For each of these areas, the airline has appropriate management systems that are developed, certified, implemented and operated in accordance with international standards. As a result of the interaction of these processes, the goals of the aviation enterprise, which determine its competitiveness, are achieved.
{"title":"ALGORITHM FOR ANALYZING DEVIATIONS AND IRREGULARITIES IN THE FUNCTIONING OF THE AIRLINE'S STRUCTURAL UNITS AND PERSONNEL IN THE FACE OF UNCERTAINTY","authors":"Jevgēnijs Tereščenko, Аleksandrs Bitins, V. Shestakov, R. Chatys, Juris Maklakov","doi":"10.3846/aviation.2020.12375","DOIUrl":"https://doi.org/10.3846/aviation.2020.12375","url":null,"abstract":"At the heart of airline flight safety management is a systematic approach to identifying hazards and controlling risk factors, which ICAO requires to collect, analyze all deviations in the activities of units, services and personnel airlines and use of its results to develop and implement management activities. That kind of the system enables the organization to predict and fix problems before they lead to an aviation accident. Thus, the organizational management structure should ensure high efficiency, reliability and completeness of the control over all components that ensure the process of the air transportation: the course of transportation, the clear operation of all units in the uninterrupted transport process and their correct matching. In modern conditions, this result is achieved based on a process approach, when the company’s activities are presented as a set of production processes (activities). For each of these areas, the airline has appropriate management systems that are developed, certified, implemented and operated in accordance with international standards. As a result of the interaction of these processes, the goals of the aviation enterprise, which determine its competitiveness, are achieved.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"51-56"},"PeriodicalIF":1.0,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44032324","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 : 2020-07-08DOI: 10.3846/aviation.2020.12653
A. Suharev, V. Shestakov, L. Vinogradov
Statistics show that the majority of aircraft accidents occurs in the vicinity of airfield areas. Yet the main factors leading to fatalities in these accidents are the forces encountered by human occupants in collision with obstacles and the presence of fire. It is possible to single out a group of “technically survivable” accidents from the total number of accidents, in which a crew member or passengers could have survived, if the evacuation took place in a timely manner. The share of such accidents is about 85–90%. However, up to 40% of passengers die in technically survivable accidents. Applicable protection systems are only adequate, if the passengers manage to exit the airplane and get to a safe distance within a limited timeframe. Although these systems have been sufficiently developed; this is one of the most significant problems in modern aviation. This means, that the study of possibilities and the development of the methods and means of passenger evacuation in aircraft accidents, specifically in and around airport areas, are relevant to be addressed.
{"title":"ESTIMATION OF EVACUATION TIME OF PASSENGERS IN AIRCRAFT ACCIDENTS WITH FIRE IN AIRFIELD AREAS","authors":"A. Suharev, V. Shestakov, L. Vinogradov","doi":"10.3846/aviation.2020.12653","DOIUrl":"https://doi.org/10.3846/aviation.2020.12653","url":null,"abstract":"Statistics show that the majority of aircraft accidents occurs in the vicinity of airfield areas. \u0000 Yet the main factors leading to fatalities in these accidents are the forces encountered by human occupants in collision \u0000 with obstacles and the presence of fire. It is possible to single out a group of “technically survivable” accidents from \u0000 the total number of accidents, in which a crew member or passengers could have survived, if the evacuation took place \u0000 in a timely manner. The share of such accidents is about 85–90%. However, up to 40% of passengers die in technically \u0000 survivable accidents. Applicable protection systems are only adequate, if the passengers manage to exit the airplane \u0000 and get to a safe distance within a limited timeframe. Although these systems have been sufficiently developed; this is \u0000 one of the most significant problems in modern aviation. This means, that the study of possibilities and the development \u0000 of the methods and means of passenger evacuation in aircraft accidents, specifically in and around airport areas, are \u0000 relevant to be addressed.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43736720","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 : 2020-07-08DOI: 10.3846/aviation.2020.12544
I. Ostroumov, Karen B. Marais, N. Kuzmenko, Nicoletta Fala
The probability of an airplane deviation from pre-planned trajectory is a core of aviation safety analysis. We propose to use a mixture of three probability density distribution functions it the task of aviation risk assessment. Proposed model takes into account the effect of navigation system error, flight technical error, and occurrence of rare events. Univariate Generalized Error Distribution is used as a basic component of distribution functions, that configures the error distribution model from the normal error distribution to double exponential distribution function. Statistical fitting of training sample by proposed Triple Univariate Generalized Error Distribution (TUGED) is supported by Maximum Likelihood Method. Optimal set of parameters is estimated by sequential approximation method with defined level of accuracy. The developed density model has been used in risk assessment of airplane lateral deviation from runway centreline during take-off and landing phases of flight. The efficiency of the developed model is approved by Chi-square, Akaike’s, and Bayes information criteria. The results of TUGED fitting indicate better performance in comparison with double probability density distribution model. The risk of airplane veering off the runway is considered as the probability of a rare event occurrence and is estimated as an area under the TUGED.
{"title":"TRIPLE PROBABILITY DENSITY DISTRIBUTION MODEL IN THE TASK OF AVIATION RISK ASSESSMENT","authors":"I. Ostroumov, Karen B. Marais, N. Kuzmenko, Nicoletta Fala","doi":"10.3846/aviation.2020.12544","DOIUrl":"https://doi.org/10.3846/aviation.2020.12544","url":null,"abstract":"The probability of an airplane deviation from pre-planned trajectory is a core of aviation safety analysis. We propose to use a mixture of three probability density distribution functions it the task of aviation risk assessment. Proposed model takes into account the effect of navigation system error, flight technical error, and occurrence of rare events. Univariate Generalized Error Distribution is used as a basic component of distribution functions, that configures the error distribution model from the normal error distribution to double exponential distribution function. Statistical fitting of training sample by proposed Triple Univariate Generalized Error Distribution (TUGED) is supported by Maximum Likelihood Method. Optimal set of parameters is estimated by sequential approximation method with defined level of accuracy. The developed density model has been used in risk assessment of airplane lateral deviation from runway centreline during take-off and landing phases of flight. The efficiency of the developed model is approved by Chi-square, Akaike’s, and Bayes information criteria. The results of TUGED fitting indicate better performance in comparison with double probability density distribution model. The risk of airplane veering off the runway is considered as the probability of a rare event occurrence and is estimated as an area under the TUGED.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"57-65"},"PeriodicalIF":1.0,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42649842","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 : 2020-05-11DOI: 10.3846/aviation.2020.12166
A. Grekhov, V. Kondratiuk, S. Ilnytska
First built models of Remotely Piloted Air System (RPAS) communication channels based on Wideband Code Division Multiple Access (WCDMA) 3GPP Standard were designed. Base Station (BS) transmission within the Radio Line of Sight (RLoS) and through the satellite using Beyond Radio Line of Sight (BRLoS) was considered. The dependencies of the Bit Error Rate (BER) on the signal-noise ratio for different RPAS velocities and WCDMA сhannel models were obtained. The dependences of the BER on the signal-noise ratio for different levels of satellite transponder nonlinearity were studied. The dependence of the BER on the BS antenna diameter in case of the transponder nonlinearity was analysed. The dependencies for satellite channel characteristics, first obtained taking into account the motion of the RPAS, make it possible to predict the behavior of the communication system in critical conditions.
{"title":"RPAS COMMUNICATION CHANNELS BASED ON WCDMA 3GPP STANDARD","authors":"A. Grekhov, V. Kondratiuk, S. Ilnytska","doi":"10.3846/aviation.2020.12166","DOIUrl":"https://doi.org/10.3846/aviation.2020.12166","url":null,"abstract":"First built models of Remotely Piloted Air System (RPAS) communication channels based on Wideband Code Division Multiple Access (WCDMA) 3GPP Standard were designed. Base Station (BS) transmission within the Radio Line of Sight (RLoS) and through the satellite using Beyond Radio Line of Sight (BRLoS) was considered. The dependencies of the Bit Error Rate (BER) on the signal-noise ratio for different RPAS velocities and WCDMA сhannel models were obtained. The dependences of the BER on the signal-noise ratio for different levels of satellite transponder nonlinearity were studied. The dependence of the BER on the BS antenna diameter in case of the transponder nonlinearity was analysed. The dependencies for satellite channel characteristics, first obtained taking into account the motion of the RPAS, make it possible to predict the behavior of the communication system in critical conditions.","PeriodicalId":51910,"journal":{"name":"Aviation","volume":"24 1","pages":"42-49"},"PeriodicalIF":1.0,"publicationDate":"2020-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42977853","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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