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Niezette M.,Telespazio VEGA Deutschland GmbH | Kuppusamy B.,Telespazio VEGA Deutschland GmbH
Proceedings of the International Astronautical Congress, IAC | Year: 2016

Sentinel-3 is one of the families of Sentinel missions specifically designed for Copernicus, the European programme for the establishment of a European capacity for Earth Observation. It will provide mediumresolution and high-accuracy optical, radar and altimetry data with adequate revisit frequency, coverage and timeliness for marine and land applications. Sentinel-3A was launched from the Plesetsk Cosmodrome on 16th February 2016. The Sentinel-3 Payload Data Ground Segment (PDGS) is responsible for acquisition, processing, archiving and dissemination of the Sentinel-3 mission data. The PDGS is currently implemented by ESA in conjunction with EUMETSAT, with Telespazio VEGA Deutschland as prime contractor for the implementation of the Core PDGS. The architecture of the PDGS is essentially driven by the mission operational concept, relying on (a) systematic acquisition fully driven by pre-defined plans based on events; (b) systematic generation of all mission products; and (c) dissemination to the users based on a subscription mechanism, whereby the users subscribe to data sets, which are then automatically and systematically delivered within strict timeliness constraints. The Near Real Time (NRT) products are made available to the users within 3 hours from sensing based on the auxiliary data available at this stage. The Short Time Critical (STC) and Non Time Critical (NTC) improved products are provided within 48 hours and 1 month respectively. The large amount of data generated by the mission combined with the strong timeliness constraints have required the development of a highly automated system with full data-driven production and dissemination relying on a mechanism of pipelining. The launch version of the system was completed in 2015, and deployed at the Core Ground Station at Svalbard (Norway), and at the processing and archiving centres at EUMETSAT in Darmstadt (Germany), DLR at Oberpfaffenhofen (Germany), ACRI in Sophia Antipolis (France) and CLS in Toulouse (France). In addition a Mission Performance Centre and a Payload Data Management Centre was deployed at ACRI. The final version of the system will be deployed at the end of the commissioning phase and include additional functionality essentially in the domain of mission performance monitoring. The paper will provide an overview of the implementation of the Sentinel-3 PDGS, concentrating on the architecture and deployment of the successive versions, and discuss the lessons learned during the first months of operations. Copyright © 2016 by the International Astronautical Federation (IAF). All rights reserved.

Agency: European Commission | Branch: FP7 | Program: CP | Phase: SPA.2010.2.1-03 | Award Amount: 2.27M | Year: 2010

Space-Data Routers is a project that has the potential to allow Space Agencies, Academic Institutes and Research Centers to share space-data generated by a single or multiple missions, in a natural, flexible, secure and automated manner. We develop a communication overlay modeled according to thematic context of missions, Ground Segment topological distribution, Agency policies and Application restrictions and requirements. We realize our model through the development of Space-Data Routers: a (Delay-Tolerant Networking) DTN-enabled device that: (i) incorporates the Space Agency administrative instructions and policies for data dissemination and resource utilization and (ii) integrates the DTN protocol stack with application, network and link layer protocols. We pay particular attention to ESA roadmap for Interplanetary Communications and implement a communication scheme that scales natively with future deployments in Space. In essence, we promote the ultimate objective of most missions, which is to return space data, which, in turn, will be disseminated and exploited for the benefit of human scientific knowledge. Space-Data Routers form an overlay suitable for exploiting space data efficiently, which is, by definition, a major objective of all space missions and probably the most significant failure today.

Kayal K.,Telespazio VEGA Deutschland GmbH | Krause C.,German Aerospace Center
14th International Conference on Space Operations, 2016 | Year: 2016

This paper proposes a “database oriented” method for sharing and processing information as an alternative to the “document oriented” practice with the objective to improve the efficiency of operations preparation. It shows how the database oriented method has been applied to MASCOT (Mobile Asteroid Surface Scout) Operations Scenario. This includes how planning requests with telecommands can be generated in a web browser, immediately further processed for power and data budget calculations up to the integration of these inputs into an integrated flight operations plan efficiently and under version control. © 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

Salt D.J.,Telespazio VEGA Deutschland GmbH
13th International Conference on Space Operations, SpaceOps 2014 | Year: 2014

This paper first discusses the political and economic factors that limit current space operations and then describes how these factors would have to be changed in order to realize the extremely ambitious operational scenarios envisaged during the first decade of the space age. It highlights the essential role of the launch vehicle in enabling all space operations but also shows the dominant role that 'customer' demand has played in both enabling and constraining the development of those same operations. Having identified space launch as a fundamental enabler of future space operations, the paper then discusses the advantages and drawbacks of a subsonic air-launched RLV; comparing and contrasting them against a wide range of other possible launcher concepts. In doing this it highlights the unique evolutionary opportunities that this concept has to offer and provides some insight as to how these may be realised and enhanced via existing technologies. Finally, the paper highlights the radical improvements in operational architecture afforded by such a vehicle. It shows how an RLV with a relatively modest launch performance of less than 5t to low Earth orbit could be capable of supporting almost all current and future launch demand by forming the key element of a fully reusable space transportation network.

Peterson S.,Telespazio VEGA Deutschland GmbH | Delhaise F.,European Space Agency
13th International Conference on Space Operations, SpaceOps 2014 | Year: 2014

This paper will discuss operations of space data links to spacecraft operating in Sun-Earth Lagrange points L1 and L2. These orbits are relatively stable and place an object on either the daylight side of the Earth (in the case of L1) or the night side of Earth (in the case of L2) at a distance of about 1.5 million kilometers. When viewed from the Earth, motion of the spacecraft is driven primarily by the rotation of the Earth. Visibility periods for a Lagrange spacecraft are on the order of 12-15 hours each day. When designing the space link, International Telecommunications Union (ITU) regulations stipulate that spacecraft closer than 2 million kilometers are treated as near Earth objects (Class-A) and spacecraft beyond 2 million kilometers are treated as deep space objects (Class-B). Lagrange missions being of class-A, the admissible minimum elevation angle of the ground station antenna used for uplink is as low as 5 degrees. In order to optimize the utilization of the ground station resources, scheduled passes have to start (or to stop) at the limit of the 5 degrees elevation as a constraint to visibility windows because radiating an uplink signal below 5 degrees is prohibited. The ITU also limits the Effective Isotropic Radiated Power (EIRP) of the uplink at low elevation above 5 degrees. For ESA ground stations, the Front End Controller is programmed to automatically mute the RF output when the ground station might violate this ITU regulation. In order to avoid an automatic switch-off of the uplink power during scheduled ground station passes, a solution was investigated and implemented for the Herschel and Planck projects. In this paper, a number of mitigation strategies are discussed to avoid these RF mute events or to integrate them in a proper way into the scheduling of the ground stations. Lessons learned from this experience could be applied to future missions being planned for L1 and L2 orbits.

Niezette M.,TELESPAZIO VEGA Deutschland GmbH
Proceedings of the International Astronautical Congress, IAC | Year: 2012

The GMES (Global Monitoring for Environment and Security) programme is a European initiative, headed by the European Commission (EC) in partnership with the European Space Agency (ESA) and the European Environment Agency (EEA) for the implementation of information services dealing with environment and security, based on observation data received from Earth Observation (EO) satellites and ground based information. Within this context, ESA is developing five families of Sentinel missions specifically designed for the GMES programme purposes. The Sentinels will provide a unique set for the Earth observations and in particular Sentinel-3 will provide medium-resolution and high-accuracy optical, radar and altimetry data with adequate revisit frequency, coverage and timeliness for marine and land applications The access to the Sentinel data will be provided through a dedicated Ground Segment infrastructure where the Payload Data Ground Segment (PDGS) is one building block. For Sentinel 3, this is currently implemented by ESA in conjunction with EUMETSAT. TELESPAZIO VEGA Deutschland is leading the Core PDGS implementation, with ACS, WERUM, and TELESPAZIO Italy as partners. The development of the PDGS Sentinel-3 is essentially driven by the approach to the mission operations. The instrument acquisitions are systematic and fully driven by a pre-defined plan based on events (geographic zones, day or night, etc.). The pre-defined acquisition plan fulfils the need of the relevant GMES services that are supported by the mission. This means that no user order is required to drive the satellite's activities. The absence of specific user orders, coupled with on-board mechanisms supporting the triggering of on-board commanding on events, lead to reducing the operations in terms of ordering and mission planning. The entire data processing chain is data driven, in a sense that each level of processing is triggered as soon as all the data (satellite data and auxiliary data) required for it to take place are available. The basic mechanism to disseminate the products to the users is the subscription mechanism, whereby the users subscribe to data sets, which are then automatically and systematically delivered. All Sentinel-3 products will be provided to the user in Near Real Time within 3 hours from sensing. Improved products based on refined auxiliary data will be made available in Short Time Critical (for some products only) within 48 hours and in Non Time Critical (NTC) within 1 month of sensing. All the elements above enable an extensive level of automation of the operations, with operators' presence limited to supervision and maintenance for most of the facilities. This is required to meet the performance requirements of the system. The paper will present the implementation and deployment of the Sentinel-3 PDGS and show how it addresses those challenges. Copyright © (2012) by the International Astronautical Federation.

Kyriopoulos O.N.,Telespazio VEGA Deutschland GmbH
Proceedings of the International Astronautical Congress, IAC | Year: 2015

We are about to experience a major shift in suborbital space access driven by new entrepreneurial ventures that are developing suborbital commercial systems to serve both existing and new markets. These new ventures are focusing their efforts on suborbital reusable launch vehicles (sRLV) capable of crossing the threshold of space (100km) and offering around one to four minutes of microgravity. A broad range of sRLV ventures is underway: some are still in the design phase, others are in their final testing phase, while a few are already operational. Their first revenue earning flights will carry science and engineering payloads and some plan to later fly space tourists. An overview of the current suborbital and microgravity capabilities will be given and then compared to the sRLV systems, which vary between vertical take-off/landing rockets and horizontally launched winged vehicles. Though more technically challenging than expendables, reusable vehicles amortize their production costs over a larger number of flights and thereby reduce their per flight unit cost. sRLVs can also achieve much higher levels of reliability and safety than expendable vehicles, and so offer a more flexible, efficient, less expensive, frequent access to space for payloads and spaceflight participants. Telespazio VEGA Deutschland has been actively promoting this emerging domain of commercial suborbital spaceflight which meets the need for high flight rates at relatively inexpensive cost, and has taken initial steps to make these new flight opportunities available to the existing research community. As most of these ventures are based in the U.S., we are also enabling non-U.S. researchers to take maximum advantage of this new, competitive way to exploit microgravity.

Bodemann C.,Telespazio VEGA Deutschland GmbH | Kalden O.,Telespazio VEGA Deutschland GmbH
RAST 2013 - Proceedings of 6th International Conference on Recent Advances in Space Technologies | Year: 2013

Satellite operation requires special knowledge, qualifications, and practical hands-on experience gained through extensive training in a very realistic simulation environment. While communication satellites can be monitored at 24/7 basis Earth Observation satellites have limited visibility from the station so that challenges such as working under pressure during short contact times and in-advance planning of the tasks have to be met. Similarly also the operation of navigation satellite constellations requires special focus on the mission-specific operational challenges, for example managing a fleet of satellites. This paper focuses on the specific challenges of operating navigation satellite constellations. © 2013 IEEE.

Bodemann C.,Telespazio VEGA Deutschland GmbH | Kalden O.,Telespazio VEGA Deutschland GmbH
RAST 2013 - Proceedings of 6th International Conference on Recent Advances in Space Technologies | Year: 2013

The space environment imposes risks on the space assets and the services provided by or depending on satellites, such as communication, navigation, and intelligence. Space assets are vulnerable and protection means are very limited. Therefore SSA is the basis for the safe usage of space and protection of valuable space assets. © 2013 IEEE.

Kalden O.,Telespazio VEGA Deutschland GmbH
RAST 2013 - Proceedings of 6th International Conference on Recent Advances in Space Technologies | Year: 2013

Global Navigation Satellite Systems (GNSS) are today part of our daily life. Besides the US Global Positioning System (GPS) further systems are in use or are being deployed such as GLONASS, GALILEO, COMPASS, IRNSS. Many effects, such as the ionosphere degrade the GNSS performance. Space Based Augmentation Systems (SBAS) augment GNSS system performance locally by broadcasting additional correction and integrity information based on measurements made by reference ground stations. Besides the two SBAS systems, the US WAAS and European EGNOS, more regional GNSS have been developed and are being developed, for example by Russia, Japan, China, and India. After a brief overview of satellite navigation systems and recent developments this paper gives an introduction to simulation of GNSS systems, discussing the challenges and types of typical simulators used, and their applications. Finally some conceptual system analysis simulation results are discussed, demonstrating the use of a GNSS simulator. © 2013 IEEE.

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