The Experts below are selected from a list of 48444 Experts worldwide ranked by ideXlab platform
Andreas Lehner - One of the best experts on this subject based on the ideXlab platform.
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characterization of the aeronautical Satellite Navigation channel through high resolution measurement and physical optics simulation
International Journal of Satellite Communications and Networking, 2008Co-Authors: Alexander Steingass, Andreas Lehner, Fernando Perezfontan, E Kubista, B ArbesserrastburgAbstract:In this paper we discuss the results of a measurement campaign investigating the environment of Satellite Navigation receivers for aeronautical applications, where reflections on the plane as well as from the ground decrease the accuracy of the positioning. The focus is on the most critical flight phase—the final approach. For this scenario a wideband model is derived, which allows to investigate the performance of present and future global Navigation Satellite systems. The work was carried out under an European Space Agency contract (ESTEC Contract number 16059/02/NL/DS) entitled ‘Navigation signal measurement campaign for critical environments’, by Joanneum Research (Austria) with subcontracts to DLR (Germany) and the University of Vigo (Spain). Copyright © 2007 John Wiley & Sons, Ltd.
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a channel model for land mobile Satellite Navigation
2005Co-Authors: Alexander Steingass, Andreas LehnerAbstract:One of the most significant problems to achieve an accurate Navigation solution for both GPS and GALILEO within cities is the multipath reception. Various channel models do exist for ground to ground communications (e.g. COST 207 for the GSM system). But there is still a lack of knowledge for broadband Satellite to earth channels. Therefore the German Aerospace Centre (DLR) performed a measurement campaign in 2002. In this campaign we used a Zeppelin to simulate a Satellite transmitting a 100 MHz broadband signal towards earth. To ensure a realistic scenario the signal was transmitted between 1460 and 1560 MHz just nearby the GPS L1 band. This signal was received by a measurement van and was recorded using a regular time grid. The so gathered data was then passed through a super resolution algorithm to detect the single reflections. In a further step we tracked the detected reflections in time and gained a knowledge about the characteristics of any isolated reflection. This includes Power distribution Delay distribution Duration statistic Doppler drift Doppler spectrum. Direct path blockage From this data we derived a channel model that is synthesising approximately the measured channel impulse response. This channel model will be presented in the talk. It allows the realistic simulation of the multipath channel by approximating every single reflection. This model includes time variant reflectors approaching and receding, appearing and disappearing reflectors and a variation of the azimuth and elevation of the Satellite. Due to the measurement approach the channel model is independent on the transmitted signal. Therefore the usability for both Navigation systems (GPS as well as GALILEO) is given. For better understanding and visualisation we will present video recordings taken during the measurements combined with the channel impulse response, Doppler delay spectrum and geometrical information.
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measuring the Navigation multipath channel a statistical analysis
Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), 2004Co-Authors: Alexander Steingass, Andreas LehnerAbstract:In this paper we present first statistical results of a high resolution measurement campaign, investigating the environment of Satellite Navigation receivers for land mobile applications, where reflections from buildings etc. decrease the accuracy of the positioning.
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a high resolution model for the aeronautical multipath Navigation channel
IEEE ION Position Location and Navigation Symposium, 2004Co-Authors: Alexander Steingass, Andreas Lehner, Fernando Perezfontan, E Kubista, M J Martin, B ArbesserrastburgAbstract:In this paper we present the results of Satellite Navigation multipath channel measurements for aeronautical applications. For the most critical scenario - the final approach, we derived a statistical channel model which we describe in detail.
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land mobile Satellite Navigation characteristics of the multipath channel
Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS GNSS 2003), 2003Co-Authors: Alexander Steingass, Andreas LehnerAbstract:In this first results of the 2002 measurement campaign are discussed, investigating the environment of Satellite Navigation receivers for land mobile applications, where reflections from e.g. buildings decrease the accuracy of the positioning.
Alexander Steingass - One of the best experts on this subject based on the ideXlab platform.
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modeling distance measurement equipment dme signals interfering an airborne gnss receiver
Annual of Navigation, 2018Co-Authors: Alexander Steingass, Thanawat Thiasiriphet, Jaron SamsonAbstract:This publication describes an end-to-end model to generate Distance Measurement Equipment (DME) signals as an interference source to airborne Global Satellite Navigation Systems (GNSS). Both Satellite Navigation systems, the Global Positioning System (GPS) and GALILEO, use the lower L-band 1 for wideband Navigation services and are sharing the same frequency band with DME. Any GNSS Receiver operating in the mentioned bands will receive DME signals and will have to deal with them as interference. This publication describes a model to rebuild the measured DME signals at the receiver input to allow simulations of the interference effect. Prior to this work we only found models based on propagation estimation. No model existed which is based on real world measurements of DME signals. Thus, the German Aerospace Center (DLR) has car- ried out a Fight measurement campaign at the European DME hotspot near Frankfurt (Main), Germany. From the data of the measurement campaign we have developed the new model. This measurement based model is much more accurate than the existing models since it accounts for the propagation and the DME transmission and the GNSS receiver antenna effects. We provide this model to the community to allow a more realistic forecast of the DME-GNSS interference situation
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characterization of the aeronautical Satellite Navigation channel through high resolution measurement and physical optics simulation
International Journal of Satellite Communications and Networking, 2008Co-Authors: Alexander Steingass, Andreas Lehner, Fernando Perezfontan, E Kubista, B ArbesserrastburgAbstract:In this paper we discuss the results of a measurement campaign investigating the environment of Satellite Navigation receivers for aeronautical applications, where reflections on the plane as well as from the ground decrease the accuracy of the positioning. The focus is on the most critical flight phase—the final approach. For this scenario a wideband model is derived, which allows to investigate the performance of present and future global Navigation Satellite systems. The work was carried out under an European Space Agency contract (ESTEC Contract number 16059/02/NL/DS) entitled ‘Navigation signal measurement campaign for critical environments’, by Joanneum Research (Austria) with subcontracts to DLR (Germany) and the University of Vigo (Spain). Copyright © 2007 John Wiley & Sons, Ltd.
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a channel model for land mobile Satellite Navigation
2005Co-Authors: Alexander Steingass, Andreas LehnerAbstract:One of the most significant problems to achieve an accurate Navigation solution for both GPS and GALILEO within cities is the multipath reception. Various channel models do exist for ground to ground communications (e.g. COST 207 for the GSM system). But there is still a lack of knowledge for broadband Satellite to earth channels. Therefore the German Aerospace Centre (DLR) performed a measurement campaign in 2002. In this campaign we used a Zeppelin to simulate a Satellite transmitting a 100 MHz broadband signal towards earth. To ensure a realistic scenario the signal was transmitted between 1460 and 1560 MHz just nearby the GPS L1 band. This signal was received by a measurement van and was recorded using a regular time grid. The so gathered data was then passed through a super resolution algorithm to detect the single reflections. In a further step we tracked the detected reflections in time and gained a knowledge about the characteristics of any isolated reflection. This includes Power distribution Delay distribution Duration statistic Doppler drift Doppler spectrum. Direct path blockage From this data we derived a channel model that is synthesising approximately the measured channel impulse response. This channel model will be presented in the talk. It allows the realistic simulation of the multipath channel by approximating every single reflection. This model includes time variant reflectors approaching and receding, appearing and disappearing reflectors and a variation of the azimuth and elevation of the Satellite. Due to the measurement approach the channel model is independent on the transmitted signal. Therefore the usability for both Navigation systems (GPS as well as GALILEO) is given. For better understanding and visualisation we will present video recordings taken during the measurements combined with the channel impulse response, Doppler delay spectrum and geometrical information.
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measuring the Navigation multipath channel a statistical analysis
Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), 2004Co-Authors: Alexander Steingass, Andreas LehnerAbstract:In this paper we present first statistical results of a high resolution measurement campaign, investigating the environment of Satellite Navigation receivers for land mobile applications, where reflections from buildings etc. decrease the accuracy of the positioning.
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a high resolution model for the aeronautical multipath Navigation channel
IEEE ION Position Location and Navigation Symposium, 2004Co-Authors: Alexander Steingass, Andreas Lehner, Fernando Perezfontan, E Kubista, M J Martin, B ArbesserrastburgAbstract:In this paper we present the results of Satellite Navigation multipath channel measurements for aeronautical applications. For the most critical scenario - the final approach, we derived a statistical channel model which we describe in detail.
Stefano Tomasin - One of the best experts on this subject based on the ideXlab platform.
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authentication of Satellite Navigation signals by wiretap coding and artificial noise
Eurasip Journal on Wireless Communications and Networking, 2019Co-Authors: Francesco Formaggio, Stefano TomasinAbstract:In order to combat the spoofing of global Navigation Satellite system (GNSS) signals, we propose a novel signal authentication method based on information-theoretic security. In particular, the Satellite superimposes to the Navigation signal an authentication signal containing a secret authentication message corrupted by artificial noise (AN). We impose the following properties: The legitimate receiver synchronizes with the Navigation signal and stores the samples of the authentication signal with the same synchronization. After the transmission of the authentication signal, through a separate public asynchronous ground channel (e.g., a secure Internet connection) additional information is made public allowing the receiver to We assess the performance of the proposed scheme by the analysis of both the secrecy capacity of the authentication message and the attack success probability under various attack scenarios.
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Authentication of Satellite Navigation Signals by Wiretap Coding and Artificial Noise
arXiv: Signal Processing, 2018Co-Authors: Francesco Formaggio, Stefano TomasinAbstract:In order to combat spoofing of global Navigation Satellite system (GNSS) signals we propose a novel approach for the authentication of these signals based on information-theoretic security. In particular we superimpose to the Navigation signal an authentication signal corrupted by artificial noise (AN), still transmitted by the Satellite. The authentication signal is a) synchronous with the Navigation signal, b) orthogonal to the Navigation signal and c) undecodable by the attacker due to the presence of the AN. The legitimate receiver synchronizes with the Navigation signal and stores the samples of the authentication signal with the same synchronization. After the transmission of the authentication signal, through a separate public asynchronous authenticated channel (e.g., a secure Internet connection) additional information is provided to users who can a) decode the authentication signal, thus overcoming the effects of AN, and b) verify the content of the authentication message thus authenticating it. We assess the performance of the proposed scheme by the analysis of both the authentication rate and the attack success probability under various attack scenarios. A comparison with existing approaches shows the effectiveness of the proposed scheme.
Peter Hannay - One of the best experts on this subject based on the ideXlab platform.
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Forensic acquisition and analysis of the TomTom One Satellite Navigation unit. Retreived December 4, 2007, from http://data.openduck.com/wp-posts/2007/12/04/paper-a-methodologyfor-the/20_Hannay%20%20A%20Methodology%20for%20the%20Forensic%20Acquisitio
2015Co-Authors: Peter HannayAbstract:Global Positioning Systems are becoming increasingly pervasive. The forensic acquisition and analysis of these units is of great interest as it has the potential to yield historic locational data for these units. Analysis of the TomTom one Satellite Navigation unit has resulted in a method to reliably extract historic data from these devices in a forensically sound manner
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Forensic Acquisition and Analysis of the TomTom One Satellite Navigation Unit
2010Co-Authors: Peter HannayAbstract:Global Positioning Systems are becoming increasingly pervasive. The forensic acquisition and analysis of these units is of great interest as it has the potential to yield historic locational data for these units. Analysis of the TomTom one Satellite Navigation unit has resulted in a method to reliably extract historic data from these devices in a forensically sound manner.
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Forensic Acquisition and Analysis of the TomTom One Satellite Navigation Unit Abstract
2009Co-Authors: Peter HannayAbstract:Global Positioning Systems are becoming increasingly pervasive. The forensic acquisition and analysis of these units is of great interest as it has the potential to yield historic locational data for these units. Analysis of the TomTom one Satellite Navigation unit has resulted in a method to reliably extract historic data from these devices in a forensically sound manner
Lei Zhang - One of the best experts on this subject based on the ideXlab platform.
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Navigation performance of the libration point Satellite Navigation system in cislunar space
Journal of Navigation, 2015Co-Authors: Lei ZhangAbstract:Based on the candidate architectures of the libration point Satellite Navigation system proposed in our previous work, a Navigation performance study is conducted in this paper to verify the cislunar Navigation ability of the proposed system. Using scalar Satellite-to-Satellite range measurement between the user and libration point Navigation Satellites, a virtual lunar exploration mission scenario is developed to verify the Navigation performance of the candidate Earth-Moon L 1,2,4,5 four-Satellite constellations. The simulation results indicate that the libration point Satellite Navigation system is available for cislunar Navigation and the Navigation accuracy of a few tens of metres can be achieved for both the trans-lunar cruise and lunar orbit phase. Besides that, it is also found that the Navigation accuracy of the libration point Satellite Navigation system is sensitive to the orbit of the L 1 Satellite. Once the L 1 Navigation Satellite is located in the Halo orbit or vertical Lyapunov orbit, the proposed system can present a better Navigation performance in cislunar space.
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a universe light house candidate architectures of the libration point Satellite Navigation system
Journal of Navigation, 2014Co-Authors: Lei ZhangAbstract:In view of the shortcomings of existing Satellite Navigation systems in deep-space performance, candidate architectures which utilise libration point orbits in the Earth-Moon system are proposed to create an autonomous Satellite Navigation system for lunar missions. Three candidate constellations are systematically studied in order to achieve continuous global coverage for lunar orbits: the Earth-Moon L 1,2 two-Satellite constellation, the Earth-Moon L 2,4,5 three-Satellite constellation and the Earth-Moon L 1,2,4,5 four-Satellite constellation. After a thorough search for possible configurations, the latter two constellations are found to be the simplest feasible architectures for lunar Navigation. Finally, an autonomous orbit determination simulation is performed to verify the autonomy of the system and two optimal configurations are obtained in a comprehensive consideration of coverage and autonomous orbit determination performance.
