Space Data Routers for Exploiting Space Data Martin Götzelmann, VEGA Vassilis Tsaoussidis, DUTH...

Space Data Routers for Exploiting Space Data

Martin Götzelmann, VEGA

Vassilis Tsaoussidis, DUTH

Sotirios Diamantopoulos, DUTH

Ioannis A. Daglis, NOA

Theodore Amanatidis, SI

Bogdan Ghita, UoP

10.-11.5.2011 ESAW 2011 - Space Data Routers page 2

Presentation Outline

• Project Context and Motivation• Delay/Disruption Tolerant Network• Study Objectives and Study Logic• Application Scenarios to Study• DTN across TM/TC Packet and AOS Protocols• Conclusions

SPACE DATA ROUTERS project has received funding from the European Union Seventh Framework Programme (FP7/ 2007-2013) under grant agreement No 263330 ([FP7/2007-2013_FP7-SPACE-2010-1, SP1 Cooperation, Collaborative project)

This presentation reflects only the authors views and the Community is not liable for any use that may be made of the information contained therein.


Team Members and Co-Authors

Team CompositionDemocritus University of Thrace, Greece (DUTH)

– Department of Electrical and Computer Engineering

– CoordinatorVEGA Space GmbHSpace Internetworks Ltd, Greece (SI)National Observatory of Athens, Greece (NOA)

– Institute for Space Applications and Remote Sensing (ISARS)

University of Plymouth, UK (UoP)– Centre for Security,

Communications, and Networks (CSCAN)

Co-AuthorsProf. Vassilis TsaoussidisSotirios Diamantopoulos

Theodore AmanatidisDr Ioannis A. Daglis

Dr. Bogdan Ghita


Project Context and Motivation

Delay / Disruption Tolerant Networks (DTN)

Timely access to space data

Dissemination of large data volumes

Science Needs

Emerging Technology


DTN in Space – Classical Scenario


BP

Transp.

LowerLayers

LowerLayers

Transp.

BP

TCP

LowerLayers

LowerLayers

Transp.

DTN Concepts and Protocols

BP

Dest.

Transp.

LowerLayers

BP

Source

TCP

LowerLayers

RegionSpecificLayers


Appl.



Appl.

Bundle Layer

Store and Forward Message Switching

LTP LTPlongdelay


Communication Scenario – Protocol Stack


DTN Status

• NASA has heavily invested in space internetworking based on DTN– Flight validation experiments

• Epoxi Spacecraft (Deep Space) 2008• ISS based payload 2009

• Adopted by CCSDS in 2008• General agreement that this is a promising technology

but different views on maturity– Open Issues

• Routing policies design and evaluation• Security concerns• Compatibility with space protocols


Previous Work by DUTH for ESOC

• Project: Extending Internet into Space– Phase 1

– Produce a design directive for space internetworking

– Phase 2• Design an appropriate DTN/IP Space-Ground Testbed and associated

scenarios for evaluation, mainly targeting Mars communications

– Phase 3– Evaluate CFDP versus DTN– Enhance DTN in the context of space internetworking (routing,

reliability)– DTN Security Mechanisms

• Prof. Tsaoussidis is ESA Delegate in the CCSDS DTN Working Group


Study Logic


Application Scenario Groups to Study

• Extending End-User Access to Space Data– CHRIS Hyperspectral Data from PROBA-1 Satellite

– AVHRR Images from POES/NOAA Satellites

• Exploiting/Disseminating Data from Deep Space– OMEGA Hyperspectral Data from ESA/Mars Express

– OSIRIS Image Data from ESA/Rosetta

• Acquisition/Delivery of Vast Volumes of Data– ESA Sentinels

• Exploiting Thematic Cross-Mission Data– Space Weather / Sun-Earth Connection

– Urban Heat Islands and Urban Thermography


Expected Impact of DTN - SDR

• PROBA-1, POES/NOAA– Extension of end-user’s access to data– Increase of data acquisition frequency– Increase of data downloading rate

• ESA/Mars Express, ESA/Rosetta– Elimination of data loss and increase of data volume received– Increase of access speed to deep space data

• ESA/Sentinels– Acquisition, management and efficient dissemination of large volumes

of data

• Multiple Missions – Real-time access to data from multiple missions– Successful acquisition of data even under hostile communication

conditions– Improved interconnection between ground and space assets


Example: Urban Heat Islands (1/2)


Example: Urban Heat Islands (2/2)

Current problems:• Different location of data. Even for the same sensor/mission the data

location differs for “real-time” and “on demand” use.• “Real-time” is only ensured when the receiving station is within ISARS. Any

other route means “near real-time” (even hours of delay), which means that any future service based on this data cannot be given in real time.

Expected impact using SDR• The application allows for data gathering from multiple missions for one

scientific objective.• Advanced protocols allow for successful data transmission even in

harsh/challenged communication conditions.• Depending on the mission, better interconnection between space and

ground assets• Data can be transferred to other DTN nodes in Space before being dumped

in Earth when direct delivery is not possible• Ensure real time data acquisition.


Routing of Data for Improved Access


DTN over TM/TC Links (1/3)

Linux Box

SIMSAT/SCM

conv

Data Link

Layer Str

eam

I/

F

Spacelink

CORBA/TCPDTN

SIMSAT/Ground

SLE/TCP

Stream I/F

SLE Provider

LAN/WANLAN/WAN

conv

Linux Box

SIMSAT/SOC

Data Link

LayerSLE

Use

r

DTN

conv

conv

LPT

BP

LPT

BP

Only for CCSDS Packet TM/TC



Linux Box

DTN

SIMSAT/SCM

conv

Data Link

Layer I/F or PCM

Linux Box

SIMSAT/SOC

Data Link LayerS

LE U

ser

SLE/TCPDTN

HW I/F

IMBU

conv

Spacelink

TCP

LAN/WANLAN/WAN

conv

conv

LTP

BP

LTP

BP

Only for CCSDS Packet TM/TC



• Downlink Packet TM – Uplink Packet TC• Downlink: AOS– Uplink AOS• Downlink: AOS– Uplink Packet TC• Using Encapsulation Packets

Linux Box

DTN TestBed/SCM

conv

Data Link

Layer

Linux Box

DTN TestBed/GS

Data Link

Layer

UDPUDP I/F co

nv

Spacelink

UDP

LTP LAN / WAN LAN / WAN UDP

I/FBP BP

LTP


Conclusions

• Objectives of the SDR Project is to investigate how DTN can support scientific users

• Space Data Routers are devices for routing of space data not only in space but also on ground, providing unified communication channels for dissemination of space data

• Expected Capabilities to be analysed– Extension of end-user access to space data;– Improved exploitation of data from deep space– Efficient delivery of vast volumes of data to end-users over

terrestrial internetworks– Potential of DTN overlays to administer thematic cross-mission

space data

Space Data Routers for Exploiting Space Data Martin Götzelmann, VEGA Vassilis Tsaoussidis, DUTH...

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