Extremely High Speed Avenues for Space Communications: Optical & W-band Waves

Monday 5th September – 10:30, Room AUDITORIUM

The current telecommunications marketplace is experiencing an ever increasing demand for high-speed services, and the traffic demand for satellite broadband is expected to grow six-fold by 2020. As part of the continuous migration towards higher frequency bands, Optical & W-band waves offer the promise of unprecedented bandwidth compared to current commercial solutions, leveraging enough bandwidth capable to cope with mid and long-term requirements. Together they can realize extremely high speed avenues for space communications in inter-satellite and feeder link applications. This tutorial focuses on giving a thorough overview of the different aspects and challenges to be taken into account when implementing GEO feeder links in the optical domain and W-band waves, including physical layer, channel model, modem, satellite payload and system level aspects. Particular attention is given to the feeder uplink scenario, which—as part of the forward link—presents itself as critical for the successful implementation of future extremely high throughput satellite systems. The tutorial will attempt to stress the practical challenges of these high frequency RF and optical technologies, proposing also ways forward in terms of necessary space and ground technology development, as well as open research directions.

Pantelis-Daniel Arapoglou

Pantelis-Daniel Arapoglou received the Diploma degree in electrical and computer engineering and the Dr.Eng. degree from the National Technical University of Athens (NTUA), Athens, Greece, in 2003 and 2007, respectively. From September 2008 to October 2010, he was involved in postdoctoral research on MIMO over satellite jointly supported by the NTUA and the European Space Agency Research and Technology Centre (ESA/ESTEC), The Netherlands. From October 2010 to September 2011, he was a Research Associate with the Interdisciplinary Centre for Security, Reliability and Trust (SnT), University of Luxembourg. Since September 2011, he has been a Communications System Engineer at ESA/ESTEC, where he is technically supporting R&D activities and developments in the areas of satellite telecommunications, digital & optical communications, and high data rate telemetry for Earth observation applications. Daniel was a recipient of the Ericsson Award of Excellence in Telecommunications for his diploma thesis in 2004 and of the URSI General Assembly Young Scientist Award in 2005. As a researcher, he has participated in the work of Study Group 3 of the ITU-R in SatNEx III and in COST Action IC0802. Currently, he is following SatNEx IV which is funded by ESA as well as the CCSDS optical Working Group.

Ricardo Barrios

Ricardo Barrios received his B.Sc. in Electronics Engineering at Universidad del Norte (Colombia) in 2006; M.Sc. in Photonics at Universitat Politèctina de Catalunya (UPC) in 2010; and his Ph.D. in Signal Theory and Communications at UPC in 2013. His Ph.D. thesis was devoted to the proposal of a new fading channel model for optical transmission through the turbulent atmosphere. His research activities have included computerized numerical control (CNC) systems, networking, embedded systems, intelligent transport systems and free-space optical (FSO) communication. Since 2013 he is with the Advanced Optical Technologies group in the Institute of Communications and Navigation at the German Aerospace Center (DLR). Currently his main field of interest is FSO systems for GEO feeder link applications, adaptive optics and optical channel modelling.

Satellite-Based Interference Localization Techniques

Tuesday 6th September – 10:30, Room AUDITORIUM

Radio Frequency Interference (RFI) represents a serious threat for the satellite industry: it is the single most important operational problem affecting customer services on geostationary satellites, causing the SATCOM industry to lose millions of dollars per year; and it is classified as a major threat to navigation systems and their users. In this context, it is becoming of critical importance to design space systems that are able to localize the interference source, allowing taking actions (e.g., sending the authorities to the place the interference originates from) that can prevent future repetitions of similar behaviours.

This tutorial will give an overview of localization approaches that are based on processing the signal sent by a target, covering aspects such as: 1) the extraction of basic features from the received signal, which define loci of points within which the target may be located; 2) the computation of a position fix from multiple loci of points; and 3) the challenges associated to a satellite based localization approach, with particular emphasis to a single satellite architecture. In addition to it, the localization results obtained with a software simulator developed by Qascom will be shown and discussed.

Luca Canzian

Luca Canzian received the B.Sc., M.Sc., and Ph.D. degrees in Electrical Engineering from the University of Padova, Italy, in 2005, 2007, and 2013, respectively. From 2007 to 2009 he worked in Venice, Italy, as an R&D Engineer at Tecnomare, a company providing design and engineering services for the oil industry. From September 2011 to March 2012 he was on leave at the University of California, Los Angeles (UCLA). From January 2013 to April 2014 he was a PostDoc at the Electrical Engineering Department at UCLA. From April 2014 to April 2015 he was a PostDoc at the Computer Science Department at University of Birmingham, UK. Since April 2015 he has been working in Bassano del Grappa, Italy, as an R&D Engineer at Qascom, a company providing design and engineering services for the satellite communication and navigation industry. Currently, his main activity involves the design and analysis of satellite-based interference localization techniques.

Information-Centric Networking for Content Distribution and Integration of Satellite Communications into the Future Internet

Tuesday 6th September – 11:30, Room AUDITORIUM

Inspired by the observation that the Internet is increasingly used for the dissemination of, or access to information, rather than for pair-wise communication between specific end hosts, Information-Centric Networking (ICN) is based on identifying content, or information, at the internetwork layer and employing information-awareness as the means for addressing a series of limitations in the current Internet architecture. The Publish-Subscribe Internet (PSI) architecture, a clean-slate ICN approach for the future Internet, was designed to satisfy current and emerging user demands for pervasive information delivery.

After a brief introduction to ICN in general, this presentation will provide an overview of the PSI architecture (developed through two European projects, PSIRP and PURSUIT) and will also present an overview of our cuurent H2020 project POINT with goal to demonstrate commercially viable deployment of existing services over ICN. PSI provides native support for network layer caching, multicast, multi-path and multi-source transport, security and privacy, and seamless mobility, which make it an excellent platform for ubiquitous multimedia information delivery for the future Internet. We will also present as case studies support for a few different applications and environments.

With video constituting the majority of all current Internet traffic and its share increasing, any future Internet architecture should provide tangible benefits for video and multimedia applications. ICN architectures were designed with the specific goal of improving content distribution on the Internet. We have considered and will discuss to what extent various ICN architectures are appropriate and ready for video traffic. We then will present how efficient delivery of real-time multimedia information can be supported in the PSI architecture, which places information at the heart of the network layer and decouples the forwarding, path formation and topology management functionalities. This design approach can be highly beneficial for real-time communications, as it enables the network to apply sophisticated mechanisms for multicast tree construction, such as delivery over optimal Steiner trees. Initial experiments with a proof-of-concept implementation of PSI indicate the feasibility of realizing such optimization policies. Our results show that significant bandwidth savings can be achieved at the cost of small, un-noticeable to the end-users, delays in flow establishment.

We also consider and illustrate key functionalities and gains when using ICN, and PSI in particular, for integrating terrestrial and satellite networks, still a major component for multimedia distribution today, by jointly exploiting the advantages of each: transparent use of terrestrial multicasting and satellite broadcasting, content-based multipath transfer, and seamless mobility. Multipath content delivery with Quality-of-Service (QoS) based routing is a powerful technique, offering bandwidth aggregation while keeping service latency low. However, the realization of multipath QoS routing in IP networks is not inherently supported and requires complicated extensions to network operation. On the other hand, the PSI architecture natively supports multicast, source routing and centralized path selection, thus posing as promising terrain for QoS routing. Finally, in modern access networks, ICN can be exploited in many ways to improve performance and robustness in a flexible way. We will briefly present two application scenarios that exploit key features of the PSI architecture: secure publication proxy and multi-source mobile video streaming.

George C. Polyzos

George C. Polyzos, Professor of Computer Science at AUEB, founded and is leading the Mobile Multimedia Laboratory (MMlab). Previously, he was Professor of Computer Science and Engineering at the University of California, San Diego, where he was co-director of the Computer Systems Laboratory, member of the Steering Committee of the Center for Wireless Communications, and Senior Fellow of the San Diego Supercomputer Center. After joining UCSD he focused his research on Internet based multimedia and wireless communications with emphasis on multimedia dissemination, automatic media adaptation and addressing heterogeneity. More recently, Prof. Polyzos and the MMlab participated in the FP7 projects PSIRP and PURSUIT that developed the Information-Centric Networking (ICN) Publish-Subscribe Internet (PSI) architecture and the ESA-funded project φSAT, which investigated “The Role of Satellite in Future Internet Services,” and he co-authored a comprehensive survey article on ICN. Prof. Polyzos was also an organizer of the EIFFEL Think Tank, on the Steering Board of the Euro-NF Network of Excellence and head of its “Socio-Economic Aspects” and “Trust, Privacy and Security” joint research activities and now participates in the SatNEx-IV network. Dr. Polyzos received his Diploma in EE from the National Technical University, Athens, Greece and his M.A.Sc. in Electrical Engineering and Ph.D. in Computer Science from the University of Toronto. He has been reviewer or panelist for many research funding agencies, including the European Commission, the US NSF, the California MICRO program, the Swiss NSF, the European ERA-Net, and the Greek GSRT; he has also been on the editorial board and guest editor for scientific journals, on the program committees of many conferences and workshops and is currently the chair of the Steering Committee of the ACM SIGCOMM conference on Information-Centric Networking and on the Steering Committee of the Wireless and Mobile Networking Conference, WG 6.8, IFIP TC6. His current research interests include Internet architecture and protocols, ICN, wireless networks and SATCOM, mobile multimedia communications, ubiquitous computing, security, privacy, and performance evaluation of computer and communications systems. Full CV at http://mm.aueb.gr/~polyzos/.

Secure Communications: a pillar for the protection of space missions

Wednesday 7th September – 10:30, Room AUDITORIUM

Synopsis: This tutorial will introduce the audience to secure communications as a fundamental building block of modern space mission security engineering. We will start with an introduction to security and security engineering as a systems engineering discipline. We will present the typical organization of security engineering methodologies. We will discuss the particular context of space missions and their security problems. We will break down the space mission security problem into its main elements: space asset, ground asset and mission products protection. We will shortly present the various types of missions like Earth observation, telecommunications and navigation, ilustrating the particulars of these mission domains with examples.

We will focus on the communications between the space and ground segments, which play a critical role on mission operations and mission products delivery and, therefore, can be the subject of various threats. We will identify the most common security objectives applicable to these communication links and will detail the various security services with corresponding countermeasures implemented to protect the communications. In particular, we will present the data link layer (authentication, encryption and authenticated encryption) and physical layer (linear and cryptographic spread spectrum) security countermeasures. Cryptography and key management are fundamental complements of these countermeasures and we will discuss their main tenets. We will introduce relevant secure communications and cryptographic algorithm standards in support of space missions like the Consultative Committee for Space Data Systems (CCSDS) Space Data Link Security (SDLS) protocolcioni. This protocol provides a modular add-on security service to the very popular CCSDS Telecommand (TC), Telemetry (TM) and Advanced Orbiting Systems (AOS) space link protocols.

To conclude we will outline current directions of space mission security research of interest like physical layer security and network security, the latter very relevant for future constellations with inter-satellite links. Furthermore, we will outline the ongoing work on SDLS extension.

As a complement of this tutorial we will provide ample bibliography for those participants interested in further pursuing the study of this fascinating engineering discipline.

Ignacio Aguilar Sanchez

Ignacio Aguilar Sanchez received a M.Sc. in Telecommunications Engineering from Polytechnic University of Catalonia, Barcelona, Spain in 1986 and an MBA from the Open University, United Kingdom in 1997. He has been with ESA for more than 20 years. He is a Communications Security expert at ESTEC. He has been involved with the definition and development of TC and TM communications security solutions for a number of ESA projects (GALILEO, Copernicus Sentinels 1 to 3, SEOSAT, Meteosat Third Generation, ARTES, MetOp Second Generation). He has supervised research and development activities concerning security functions both at radio and data level. Prior to this he was the lead Communications System Engineer for the Automated Transfer Vehicle (ATV) during its design and development phase. This mission included a TC Security function as well as spread spectrum communications. Before he had organized and conducted In-Orbit Testing for an ESA Telecommunications Payload. He started his career with ESA on the HERMES project as a Reliability and Safety Engineer.

William Halimi

William Halimi received a Electronic Engineer Diploma from the ENSEEIHT high school of Toulouse FRANCE in 1979. He works since 20 years in Thales Alenia Space (TAS) in Toulouse, on Satellite / Ground communications links security. As TAS France security engineering group manager, he has been technical lead for most Telecommunication & Observation space data links authentication and/or encryption systems designed & developed by TAS. He has driven some R&T Security study with CNES (2009 and 2014) and presented security contributions to last ESA TTC workshops (2007, 2010 and 2013)