DLR - Institute of Communications and Navigation - Projekte D

Current Projects D - K

	EGNOS V3 EGNOS (European Geostationary Navigation Overlay Service) V3 definition phase (phase A activity) encompasses challenging and ambitious objectives paving the way for Europe to play a leading role in global navigation satellite systems (GNSS) for the post 2020 period.
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Dependable Navigation

Reliable and ubiquitous positioning and navigation is of central importance for many applications in economy, mass market, and sovereign tasks. With the ongoing development of EGNOS and Galileo, Europe makes a significant contribution to the global provision of navigation infrastructures and will create first prerequisites for a wide spectrum of new positioning, navigation and time services.

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GeReLEO

Low-Earth-orbit (LEO) satellites require both data links for telemetry, tracking and command (TT&C) and for download of mission data (e.g., Earth observation). A single ground station can maintain a contact to a passing LEO satellite for relatively short time only (typically ~10 min), and together with high-resolution sensor systems onboard the satellites producing high amounts of data this leads to a serious bottleneck. In fact, depending on the actual orbit parameters (altitude and inclination) the long-term average visibility as seen from one ground station is only 1% to 6% of the overall orbit time.

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	DLR@Uni Ab Januar 2012 erhält das Institut KN über Munich Aerospace eine Förderung im Rahmen der Helmholtz-Allianz DLR@Uni. Ziel dieser Allianz ist der Aufbau und Ausbau von Forschungsnetzwerken zwischen den DLR-Instituten und den regional ansässigen Universitäten und die Intensivierung der Doktorandenausbildung in strukturierten Programmen.
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DVB-RCS Next Generation Support and Verification Testbed

The aim of the project is to validate the recently standardised 2nd generation of DVB-RCS within ETSI, with particular attention on the implementation of lower and higher layers (LL, HL). To this end, the major output of the project will be the implementation of a testbed reproducing main functionalities of DVB-S2 and DVB-RCS2, thus serving as baseline for development of future hub and satellite terminals.

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extended-HIgh performance MAss market GNSS receiver muLti stAndard readY for mArket (e-HIMALAYA)

The e-HIMALAYA project aims at prototyping innovative GNSS-based core technologies and concepts, with the objective to build key Galileo differentiators in a multi-GNSS hybridized receiver. Several markets are addressed with the main weight put on Mass-Market and transport, which represents the main Galileo receiver market.

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	Externe SI-SAP (“Erstellungen der Spezifikation Broadband Satellite Multimedia SI-SAP als externe Schnittstelle”) The project provides a basis for the study and the design of the SI-SAP interface, conceived as an external interface between Satellite Independent (SI) and Satellite Dependent (SD) layers implemented in different nodes.
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	Fahrerassistenzsystem (FAS) Ziel des Projekts Fahrerassistenzsystem (FAS) ist, individuelle und gruppenspezifische Unterstützungsmöglichkeiten zur Verkehrsteilnahme u. a. auf der Basis von Fahrzeug-zu-Fahrzeug Kommunikation zu erarbeiten und prototypisch zu realisieren.
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FEC4Space - Forward Error Correction Coding for Near-Earth and Deep-Space Communication Links

The project is dealing with the design and with an approach to a standardisation of new forward error correction codes for optical near-earth and deep-space data links as well as for RF deep-space data links. The new forward error correction mechanisms, which are based on LDPC codes, promise both an enhanced error correction capability and low complexity. This improved performance enables higher data rates or alternatively a saving of transmitter power with comparably low effort. Especially for space communication saving of transmitter power is a very important aspect, because this influences positively the design of the whole spacecraft or satellite (e.g. smaller solar panels, less volume and mass, smaller RF amplifiers, smaller radiators for cooling).

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	Flexiguide The project flexiGuide picks up the main concept ideas from the earlier FAGI project and takes their development a step farther: Trajectory-based arrival management, user preferred trajectories, mixed traffic with different equipage, late merging point on final approaches, individual optimized flight profiles, and time based arrival management.
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GALANT

Future navigation services provided by upcoming satellite systems like Galileo will require corresponding improvements of the receiving systems. Particularly, interference and multipath signals may cause a significant degradation of the performance and thus make it impossible, to obtain exact and reliable positioning data. These restrictions and uncertainties cannot be tolerated for Safety-of-Life (SoL) applications e.g. in aeronautics and shipping. In order to overcome this problem, adaptively steered antenna arrays are employed, which enable the use of new beamforming and signal processing algorithms. They provide a more exact and reliable navigation solution, by suppressing interferences and multipath signals and improving the reception of the information signal from the direction of the satellite.

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Galileo SEIOT

The acronym Galileo SEIOT is standing for Galileo IOV Signal characterisation and Extended In-Orbit Tests. End of 2011 the first Galileo IOV satellites shall be launched. A further launch is planed to begin of 2012. The Galileo IOV satellites will be the first satellites in the Galileo program which synchronously transmit the operational Galileo signals in all three frequency bands. Aim of the project Galileo-SEIOT is the analysis of Galileo IOV satellites in terms of detailed signal characterization and Extended In-Orbit-Tests.

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Galileo SMF

The acronym Galileo SMF ist standing for Signal Monitoring Facility for Galileo FOC Phase. To the beginning of 2011 the institute was mandated to provide a measurement and analysis service in cooperation with the GSOC for the Galileo FOC satellites. Aim of the project is to provide the European Commission represented by European Space Agency and their industry partners (Thales Alenia Space) an independent possibility for measurement of the Signal-in-Space (SIS) of the Galileo satellites after their launch and the In-Orbit Test (IOT) phase.

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	GATE-GTF Between 2002 and 2010 a German industry consortium under the leadership of IFEN GmbH (Poing near Munich) a ground based flexible German Galileo Test Environment (GATE) was developed in the south of Germany.
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GeReLEO-MODULOS (Entwicklung eines GeReLEO-Modems für ein Flugexperiment auf einem LEO-Satelliten)

Niedrigfliegende (LEO) Satelliten benötigen für viele Anwendungen, wie z.B. die Erdbeobachtung, Datenverbindungen mit möglichst langen Kontaktzeiten. Direkte Kommunikationsverbindungen zwischen einem LEO-Satelliten und einer Bodenstation können jedoch immer nur bei Sichtbarkeit des LEO Satelliten für etwa 10 Minuten aufgebaut werden. Für Erdbeobachtungssatelliten auf polaren Orbits ergeben sich so typischerweise im Zeitmittel pro Tag Zugriffszeiten von ca. 60 bis 70 Minuten. Diese vergleichsweise kurze Zeitdauer stellt sich angesichts der ständig wachsenden Anforderungen hinsichtlich der akquirierten Datenmengen mehr und mehr als Nadelöhr dar. Jedoch auch für LEO-Satellitensysteme mit Echtzeitanforderung erweist sich die limitierte Zugriffsmöglichkeit, die direkte Bodenstationskontakte bieten als problematisch. Als Möglichkeit zur Linderung der beschriebenen Problemstellungen wird häufig der Einsatz weltweiter Bodenstationsnetzwerke gewählt. Allerdings erlaubt auch dieser Ansatz insbesondere hinsichtlich der Echtzeitfähigkeit keine durchgängigen Kontaktzeiten und ist überdies grundsätzlich überaus kostspielig.

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	Glove Galileo Integrated Optimization with VANET Enhancements (GLOVE) is a technological STREP project which investigates the mutual benefits coming from the cross-domain integration between the Galileo/EGNOS Global Navigation Satellite System and Vehicular Ad-Hoc Networks.
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High Throughput Decoders (Direct to Home System Demonstrator for High Throughput Multimedia Applications)

In the framework of the ESA project “Direct to Home System Demonstrator for High Throughput Multimedia Applications” - ITT6613, DLR Institute of Communications and Navigation is investigating the design of new forward error correction schemes to extend the capabilities of DVB-S2 towards lower signal-to-noise ratios and high-throughput decoder implementations. Investigations are carried out in the directions of long forward error correction codes with lower decoding complexity, and of PL Header codes able to work at extremely-low signal-to-noise ratios. In the Figure, a new code with block length 4 times smaller than the one used by DVB-S2 is compared with the DVB-S2 LDPC code, showing how a performance close to that on DVB-S2 can be achieved with much shorter codes. The design shall facilitate the development of high-throughput satellite broadcasting solutions with high service availabilities.

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HETEREX

In the research project HETEREX, the Institute for Communication and Navigation is involved in work package 2 "Communcation, Navigation and Surveillance". HETEREX is funded by the Federal Ministry of Economic s, call LuFo IV . To support industry partners DLR researches novel algorithms in the field of ground-based augmentation systems (GBAS) for guiding aircraft on final approach using satellite navigation.

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KOMPASSION

For the transport of persons and goods on the road and by train as well as in aeronautics and maritime traffic the accurate and reliable positioning with existing and future satellite systems such as GPS and Galileo is of eminent importance. The high requirements, however, in particular regarding safety from interference, cannot be fulfilled with commercial receivers any more. An alternative is the use of receiving systems that employ array antennas in connection with suitable algorithms for adaptive beamforming and steering (e.g. digital beamforming, DBF), which have proven to suppress jammers, interferes and multipath signals very efficiently.

EGNOS V3

Dependable Navigation

GeReLEO

DLR@Uni

DVB-RCS Next Generation Support and Verification Testbed

extended-HIgh performance MAss market GNSS receiver muLti stAndard readY for mArket (e-HIMALAYA)

Externe SI-SAP (“Erstellungen der Spezifikation Broadband Satellite Multimedia SI-SAP als externe Schnittstelle”)

Fahrerassistenzsystem (FAS)

FEC4Space - Forward Error Correction Coding for Near-Earth and Deep-Space Communication Links

Flexiguide

GALANT

Galileo SEIOT

Galileo SMF

GATE-GTF

GeReLEO-MODULOS (Entwicklung eines GeReLEO-Modems für ein Flugexperiment auf einem LEO-Satelliten)

Glove

High Throughput Decoders (Direct to Home System Demonstrator for High Throughput Multimedia Applications)

HETEREX

KOMPASSION