Pub Date : 2017-09-01DOI: 10.1109/DASC.2017.8102084
Lin Zhao, Feng He, Jun Lu
The embedded avionics system is a typical mission-critical and safety-critical system, and should ensure fulfillment of all constraints for all flows with individual timing requirements transmitted in networks. Scheduling strategies are used to meet this requirement, and different networking solutions have different approaches. AFDX (Avionics Full-DupleX Switched Ethernet) implements a SPQ (Strict Priority Queuing) scheduling strategy with two priority levels where large flow bursts from high priority data would lead to high delays for low priority flows. Ethernet-AVB (Audio Video Bridging) implements Credit-Based Shapers (CBS) on top of the SPQ mechanism, which can partly mitigate this problem. This kind of scheduling strategy could be considered in an avionics context for mix-criticality systems. In this paper, CBS and SPQ scheduling algorithms are compared especially from the worst-case criteria by using network calculus approach. Results show that compared with SPQ, CBS has a better anti-interference ability, though it would bring a bigger delay even from the worst-case prospective.
{"title":"Comparison of AFDX and audio video bridging forwarding methods using network calculus approach","authors":"Lin Zhao, Feng He, Jun Lu","doi":"10.1109/DASC.2017.8102084","DOIUrl":"https://doi.org/10.1109/DASC.2017.8102084","url":null,"abstract":"The embedded avionics system is a typical mission-critical and safety-critical system, and should ensure fulfillment of all constraints for all flows with individual timing requirements transmitted in networks. Scheduling strategies are used to meet this requirement, and different networking solutions have different approaches. AFDX (Avionics Full-DupleX Switched Ethernet) implements a SPQ (Strict Priority Queuing) scheduling strategy with two priority levels where large flow bursts from high priority data would lead to high delays for low priority flows. Ethernet-AVB (Audio Video Bridging) implements Credit-Based Shapers (CBS) on top of the SPQ mechanism, which can partly mitigate this problem. This kind of scheduling strategy could be considered in an avionics context for mix-criticality systems. In this paper, CBS and SPQ scheduling algorithms are compared especially from the worst-case criteria by using network calculus approach. Results show that compared with SPQ, CBS has a better anti-interference ability, though it would bring a bigger delay even from the worst-case prospective.","PeriodicalId":130890,"journal":{"name":"2017 IEEE/AIAA 36th Digital Avionics Systems Conference (DASC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128244251","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 : 2017-09-01DOI: 10.1109/DASC.2017.8102058
J. Vlk, Peter Chudý
The paper introduces a description of a Linear Quadratic Regulator (LQR) / Linear Quadratic Gaussian (LQG) controller design along with related basic theory. The LQR/LQG controller of a digital autopilot is subjected to performance evaluation tests, which consider various performance and stability requirements issued by the regulatory agencies. The design's robustness is tested on a General Aviation aircraft simulation model.
{"title":"General aviation digital autopilot design based on LQR/LQG control strategy","authors":"J. Vlk, Peter Chudý","doi":"10.1109/DASC.2017.8102058","DOIUrl":"https://doi.org/10.1109/DASC.2017.8102058","url":null,"abstract":"The paper introduces a description of a Linear Quadratic Regulator (LQR) / Linear Quadratic Gaussian (LQG) controller design along with related basic theory. The LQR/LQG controller of a digital autopilot is subjected to performance evaluation tests, which consider various performance and stability requirements issued by the regulatory agencies. The design's robustness is tested on a General Aviation aircraft simulation model.","PeriodicalId":130890,"journal":{"name":"2017 IEEE/AIAA 36th Digital Avionics Systems Conference (DASC)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128301325","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 : 2017-09-01DOI: 10.1109/DASC.2017.8102076
S. Torres, Jonathan Dehn
Finding the optimal path through a wind field could represent significant time and fuel savings to operators. This paper presents an algorithm to search for the optimal path through wind using elements of Particle Swarm Optimization. The best-path search algorithm relies on a technique to sample the wind ahead and around the inertial direction and to modify subsequent steps so that the path follows the direction where winds are more favorable. Several implementation choices, such as coordinate system, incorporating randomness in the best-path search and use of standard optimizers were evaluated. Results of potential gains in time and fuel burn savings obtained with optimized trajectories are presented.
{"title":"Wind optimal trajectories for UAS and light aircraft","authors":"S. Torres, Jonathan Dehn","doi":"10.1109/DASC.2017.8102076","DOIUrl":"https://doi.org/10.1109/DASC.2017.8102076","url":null,"abstract":"Finding the optimal path through a wind field could represent significant time and fuel savings to operators. This paper presents an algorithm to search for the optimal path through wind using elements of Particle Swarm Optimization. The best-path search algorithm relies on a technique to sample the wind ahead and around the inertial direction and to modify subsequent steps so that the path follows the direction where winds are more favorable. Several implementation choices, such as coordinate system, incorporating randomness in the best-path search and use of standard optimizers were evaluated. Results of potential gains in time and fuel burn savings obtained with optimized trajectories are presented.","PeriodicalId":130890,"journal":{"name":"2017 IEEE/AIAA 36th Digital Avionics Systems Conference (DASC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129721011","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 : 2017-09-01DOI: 10.1109/DASC.2017.8102116
Hee Wei Gary Foo, Z. Zhong
Air traffic demand around the world is forecasted to increase, and will therefore put additional strain on the air traffic management system currently used. In the sectorless airspace concept, air traffic controllers are no longer tied to sectors of airspace, but to specific flights. Each controller will maintain radio contact with several aircraft and guide them from the entry to the exit of the airspace. This is a move away from the current geographical attachment of one sector to one controller. For this concept to work, each controller will have a unique voice communication frequency, and this frequency has to propagate to the extreme ends of the airspace. Furthermore, a free-route sectorless airspace has the capacity to support many more aircraft than the current system. Consequently, the number of controllers and indirectly, the number of voice communication frequencies required, will increase as well. This paper presents several restrictions on VHF frequency usage and discusses the problem with regards to the VHF frequencies allocation arising from the implementation of a sectorless airspace. It also provides a preliminary analysis of the VHF voice communication capacity through a simple mathematical formulation. Using a simple concentric buffer zone in which the repeated use of the same frequency is prohibited, the current voice communication infrastructure is estimated to only support up to 5% or 18% of the maximum capacity of a sectorless airspace. Finally, several possible solutions such as adaptations to the VHF system, digital radio, and satellite systems are briefly reviewed.
{"title":"Analysis of the voice communication capacity for a free-route sectorless airspace","authors":"Hee Wei Gary Foo, Z. Zhong","doi":"10.1109/DASC.2017.8102116","DOIUrl":"https://doi.org/10.1109/DASC.2017.8102116","url":null,"abstract":"Air traffic demand around the world is forecasted to increase, and will therefore put additional strain on the air traffic management system currently used. In the sectorless airspace concept, air traffic controllers are no longer tied to sectors of airspace, but to specific flights. Each controller will maintain radio contact with several aircraft and guide them from the entry to the exit of the airspace. This is a move away from the current geographical attachment of one sector to one controller. For this concept to work, each controller will have a unique voice communication frequency, and this frequency has to propagate to the extreme ends of the airspace. Furthermore, a free-route sectorless airspace has the capacity to support many more aircraft than the current system. Consequently, the number of controllers and indirectly, the number of voice communication frequencies required, will increase as well. This paper presents several restrictions on VHF frequency usage and discusses the problem with regards to the VHF frequencies allocation arising from the implementation of a sectorless airspace. It also provides a preliminary analysis of the VHF voice communication capacity through a simple mathematical formulation. Using a simple concentric buffer zone in which the repeated use of the same frequency is prohibited, the current voice communication infrastructure is estimated to only support up to 5% or 18% of the maximum capacity of a sectorless airspace. Finally, several possible solutions such as adaptations to the VHF system, digital radio, and satellite systems are briefly reviewed.","PeriodicalId":130890,"journal":{"name":"2017 IEEE/AIAA 36th Digital Avionics Systems Conference (DASC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124377643","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 : 2017-09-01DOI: 10.1109/DASC.2017.8102142
David M. Roach, I. Demirkiran
Computer Aided Drafting (CAD) is pervasive in engineering fields today. It has become indispensable for planning, creating, visualizing, troubleshooting, collaborating, and communicating designs before they exist in physical form. From the beginning, CAD was created to be used by means of a mouse, keyboard, and monitor. Along the way, other, more specialized interface devices were created specifically for CAD that allowed for easier and more intuitive navigation within a 3D space, but they were at best stopgap solutions. Virtual Reality (VR) allows users to navigate and interact with digital 3D objects and environments the same way they would in the real world. For this reason, VR is a natural CAD interface solution. Using VR as an interface for CAD software, creating will be more intuitive and visualizing will be second nature.
{"title":"Computer aided drafting virtual reality interface","authors":"David M. Roach, I. Demirkiran","doi":"10.1109/DASC.2017.8102142","DOIUrl":"https://doi.org/10.1109/DASC.2017.8102142","url":null,"abstract":"Computer Aided Drafting (CAD) is pervasive in engineering fields today. It has become indispensable for planning, creating, visualizing, troubleshooting, collaborating, and communicating designs before they exist in physical form. From the beginning, CAD was created to be used by means of a mouse, keyboard, and monitor. Along the way, other, more specialized interface devices were created specifically for CAD that allowed for easier and more intuitive navigation within a 3D space, but they were at best stopgap solutions. Virtual Reality (VR) allows users to navigate and interact with digital 3D objects and environments the same way they would in the real world. For this reason, VR is a natural CAD interface solution. Using VR as an interface for CAD software, creating will be more intuitive and visualizing will be second nature.","PeriodicalId":130890,"journal":{"name":"2017 IEEE/AIAA 36th Digital Avionics Systems Conference (DASC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125635073","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 : 2017-09-01DOI: 10.1109/DASC.2017.8102071
Logan M. Branscum, Cody T. Nichols
Established on Required Navigation Performance (EoR) (RNP) is an operational concept which leverages performance-based navigation (PBN) to eliminate the separation requirement of 1000 feet vertically or 3 nautical miles horizontally. EoR promises many benefits to the National Airspace System (NAS) such as increased navigational performance, reduced pilot and controller work load, and lower track miles flown. Prior work presented the results from human-in-the-loop experimentation designed to assess these operations and the development of collision risk models that leverage these experimental results. This paper focuses on the application of the models recently derived and interpretation of results obtained. The results indicate mid-air collision risk is between 10−9 and 10−10 per operation for simultaneous independent EoR operations to dual parallel runways separated by 3600 feet or greater and to triple parallel runways separated by 3900 feet or greater regardless of whether the turns were designed with TF or RF legs.
{"title":"Quantification of midair collision risk for established on required navigation performance operations","authors":"Logan M. Branscum, Cody T. Nichols","doi":"10.1109/DASC.2017.8102071","DOIUrl":"https://doi.org/10.1109/DASC.2017.8102071","url":null,"abstract":"Established on Required Navigation Performance (EoR) (RNP) is an operational concept which leverages performance-based navigation (PBN) to eliminate the separation requirement of 1000 feet vertically or 3 nautical miles horizontally. EoR promises many benefits to the National Airspace System (NAS) such as increased navigational performance, reduced pilot and controller work load, and lower track miles flown. Prior work presented the results from human-in-the-loop experimentation designed to assess these operations and the development of collision risk models that leverage these experimental results. This paper focuses on the application of the models recently derived and interpretation of results obtained. The results indicate mid-air collision risk is between 10−9 and 10−10 per operation for simultaneous independent EoR operations to dual parallel runways separated by 3600 feet or greater and to triple parallel runways separated by 3900 feet or greater regardless of whether the turns were designed with TF or RF legs.","PeriodicalId":130890,"journal":{"name":"2017 IEEE/AIAA 36th Digital Avionics Systems Conference (DASC)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126983202","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 : 2017-09-01DOI: 10.1109/DASC.2017.8102077
Marvic Attard, Brian Zammit, D. Zammit-Mangion
In this paper, a concept of real-time planning of flight extension paths is presented. The technique is intended to assist the flight crew in managing the aircraft energy when excessive energy deviations are detected. The proposed mathematical problem uses B-Spline functions to ensure smooth and fly able extension paths. An optimizer is used to solve the resulting parametric optimization problem that yields values of control points defining the shape of the spline. Preliminary results show that the technique can provide consistent extension paths at a very low computation expense.
{"title":"Real-time path planning for energy recovery management","authors":"Marvic Attard, Brian Zammit, D. Zammit-Mangion","doi":"10.1109/DASC.2017.8102077","DOIUrl":"https://doi.org/10.1109/DASC.2017.8102077","url":null,"abstract":"In this paper, a concept of real-time planning of flight extension paths is presented. The technique is intended to assist the flight crew in managing the aircraft energy when excessive energy deviations are detected. The proposed mathematical problem uses B-Spline functions to ensure smooth and fly able extension paths. An optimizer is used to solve the resulting parametric optimization problem that yields values of control points defining the shape of the spline. Preliminary results show that the technique can provide consistent extension paths at a very low computation expense.","PeriodicalId":130890,"journal":{"name":"2017 IEEE/AIAA 36th Digital Avionics Systems Conference (DASC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127195237","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 : 2017-09-01DOI: 10.1109/DASC.2017.8102144
T. Iijima, T. Uemura, N. Matayoshi, J. Entzinger, Jun Matsumoto, S. Ueda, E. Yoshikawa
We have developed a prototype of a new air speed information system leveraging the technological advance of a practical airborne Doppler Light Detection and Ranging (LIDAR). The proposed system uses the LIDAR to sense wind speeds up to several tens of seconds ahead of an aircraft in real time, and uses the data to provide predictive airspeed information called L-PSPD (LIDAR-based predicted airspeed indicator) and a target approach speed called a L-TSPD (LIDAR-based target airspeed indicator) to the pilot via a newly designed cockpit display and/or directly to the autothrottle system. A series of piloted evaluations was carried out by flight simulator and flight test to verify the effectiveness of the system. The results indicate that the proposed system improved airspeed control performance and reduced workload during approaches under windshear and turbulent conditions. We obtained the advantages and disadvantages of each proposed display from subjective evaluation data and objective workload data from visual secondary task performance, electroencephalogram (EEG), electrocardiogram (ECG) and eye recorder.
{"title":"Development and evaluation of a new airspeed information system utilizing airborne Doppler LIDAR","authors":"T. Iijima, T. Uemura, N. Matayoshi, J. Entzinger, Jun Matsumoto, S. Ueda, E. Yoshikawa","doi":"10.1109/DASC.2017.8102144","DOIUrl":"https://doi.org/10.1109/DASC.2017.8102144","url":null,"abstract":"We have developed a prototype of a new air speed information system leveraging the technological advance of a practical airborne Doppler Light Detection and Ranging (LIDAR). The proposed system uses the LIDAR to sense wind speeds up to several tens of seconds ahead of an aircraft in real time, and uses the data to provide predictive airspeed information called L-PSPD (LIDAR-based predicted airspeed indicator) and a target approach speed called a L-TSPD (LIDAR-based target airspeed indicator) to the pilot via a newly designed cockpit display and/or directly to the autothrottle system. A series of piloted evaluations was carried out by flight simulator and flight test to verify the effectiveness of the system. The results indicate that the proposed system improved airspeed control performance and reduced workload during approaches under windshear and turbulent conditions. We obtained the advantages and disadvantages of each proposed display from subjective evaluation data and objective workload data from visual secondary task performance, electroencephalogram (EEG), electrocardiogram (ECG) and eye recorder.","PeriodicalId":130890,"journal":{"name":"2017 IEEE/AIAA 36th Digital Avionics Systems Conference (DASC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122434102","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 : 2017-09-01DOI: 10.1109/DASC.2017.8102016
R. Rocchio, F. Corraro, U. Ciniglio, L. Garbarino, N. Genito, L. Verde, F. Fusco, V. Castrillo, A. Rispoli, L. Vecchione
Flight-testing of Unmanned Aerial Systems (UASs) avionic technologies can be quite difficult and expensive due to the current flight safety restrictions. Optionally Piloted Aircrafts (OPAs) overcome part of these issues thanks to the presence of an on-board safety pilot (SP). This paper describes the Italian Aerospace Research Centre's (CIRA) on-board, communication and on-ground systems used to convert a commercial manned fixed wing Aircraft (A/C) into an OPA that can be operated like a Remotely Piloted Aircraft System (RPAS). This facility allowed a low cost flight campaign to analyse the feasibility of UAS Integration in the Civil Airspace and evaluate the workload of Traffic Controller (TC) and Remote Flight Operator (RFO). The paper also illustrates the process and tests requested by the National Aviation Authority to grant the Permit to Fly (PtF). Finally, some selected results of the flight test campaign are included to demonstrate the performance and capabilities of the proposed OPA avionic architecture to perform UAS-like real operating missions and so safely allow low cost flight trials for RPAS integration in the civil airspace.
{"title":"Flight testing avionics of an optionally piloted aircraft for UAS integration in the civil airspace","authors":"R. Rocchio, F. Corraro, U. Ciniglio, L. Garbarino, N. Genito, L. Verde, F. Fusco, V. Castrillo, A. Rispoli, L. Vecchione","doi":"10.1109/DASC.2017.8102016","DOIUrl":"https://doi.org/10.1109/DASC.2017.8102016","url":null,"abstract":"Flight-testing of Unmanned Aerial Systems (UASs) avionic technologies can be quite difficult and expensive due to the current flight safety restrictions. Optionally Piloted Aircrafts (OPAs) overcome part of these issues thanks to the presence of an on-board safety pilot (SP). This paper describes the Italian Aerospace Research Centre's (CIRA) on-board, communication and on-ground systems used to convert a commercial manned fixed wing Aircraft (A/C) into an OPA that can be operated like a Remotely Piloted Aircraft System (RPAS). This facility allowed a low cost flight campaign to analyse the feasibility of UAS Integration in the Civil Airspace and evaluate the workload of Traffic Controller (TC) and Remote Flight Operator (RFO). The paper also illustrates the process and tests requested by the National Aviation Authority to grant the Permit to Fly (PtF). Finally, some selected results of the flight test campaign are included to demonstrate the performance and capabilities of the proposed OPA avionic architecture to perform UAS-like real operating missions and so safely allow low cost flight trials for RPAS integration in the civil airspace.","PeriodicalId":130890,"journal":{"name":"2017 IEEE/AIAA 36th Digital Avionics Systems Conference (DASC)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122991968","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 : 2017-09-01DOI: 10.1109/DASC.2017.8102055
Yang Ding, Yunlu Xiao, Jindong Xie, Zhang Tao
In traditional wired or cellular communication, the communication scenario and channel are fixed. However, with an increasing interest in air-ground integrated communication network, communication scenario transition caused by dynamic and high-movement nodes happens frequently, resulting in deteriorating reliability of communication. In this paper, a time-varying channel model is proposed to describe the continuous-time characteristics of scenario transferring process. The model constructs the geometric structure firstly. According to the structure, the characteristic of line-of-sight (LOS) and ground-reflection propagation path are analyzed in scenario transferring process, and the velocity and position of ground nodes are formulated as function of continuous-time. Moreover, the value of parameters of transition model is proposed with scenario changing referred to stochastic tap-delay-line (TDL) model and measured data. Simulation shows that the proposed model could effectively describe the continuous transition of channel when scenario is changing. In addition, considering the requirements of low-altitude air-ground channel measurement, a special channel sounder system based on universal software radio platform (USRP) is designed, which has small size and weight, and could be carried for drone or high-altitude platform (HAP). Test result shows that the channel sounder system could measure time delay, multipath power and Doppler frequency, and the response for Doppler frequency could be modeling as a linear function.
{"title":"A time-varying transition channel model for air-ground communication","authors":"Yang Ding, Yunlu Xiao, Jindong Xie, Zhang Tao","doi":"10.1109/DASC.2017.8102055","DOIUrl":"https://doi.org/10.1109/DASC.2017.8102055","url":null,"abstract":"In traditional wired or cellular communication, the communication scenario and channel are fixed. However, with an increasing interest in air-ground integrated communication network, communication scenario transition caused by dynamic and high-movement nodes happens frequently, resulting in deteriorating reliability of communication. In this paper, a time-varying channel model is proposed to describe the continuous-time characteristics of scenario transferring process. The model constructs the geometric structure firstly. According to the structure, the characteristic of line-of-sight (LOS) and ground-reflection propagation path are analyzed in scenario transferring process, and the velocity and position of ground nodes are formulated as function of continuous-time. Moreover, the value of parameters of transition model is proposed with scenario changing referred to stochastic tap-delay-line (TDL) model and measured data. Simulation shows that the proposed model could effectively describe the continuous transition of channel when scenario is changing. In addition, considering the requirements of low-altitude air-ground channel measurement, a special channel sounder system based on universal software radio platform (USRP) is designed, which has small size and weight, and could be carried for drone or high-altitude platform (HAP). Test result shows that the channel sounder system could measure time delay, multipath power and Doppler frequency, and the response for Doppler frequency could be modeling as a linear function.","PeriodicalId":130890,"journal":{"name":"2017 IEEE/AIAA 36th Digital Avionics Systems Conference (DASC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123057410","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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