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IMPLEMENTATION OF A TTC NETWORK FOR THE
SCISAT-1 LEOP
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• PRESENTATION OVERVIEW
• Section 1 THE SCISAT-1 MISSION
• -Mission Objectives
• -Satellite Technical Information
• Section 2 PREVIOUS CSA SUPPORT TO OTHER SPACE
  AGENCIES
• -CNES
• -DLR

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• PRESENTATION OVERVIEW-2
• Section 3 SCISAT-1 LEOP SUPPORT REQUIREMENTS
• -Constraints / Challenges
• -LEOP First Orbits Visibility
• -Stations selected and coverage
• Section 4 SCISAT-1 TM/TC
• -TM/TC Format and Specifics
• -Stations Compatibility Testing

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• PRESENTATION OVERVIEW-3
• Section 5 DATA AND VOICE INTERCONNECTION
• Voice and Data Network Requirements
• Voice and Data Network Configuration
• Section 6 SCHEDULE
• Section 7 OVERALL PERFORMANCE / ACKNOWLEDGEMENTS
• TTC Stations Performance
• Data and Voice Interconnection Performance

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Section 1 THE SCISAT-1 MISSION
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Section 1 SCISAT-1 Mission

• 1.1 Mission Objectives
• -Goal
• Investigate the chemical processes involved in
  the distribution of
• ozone in the atmosphere to understand why and
  how fast the
• ozone layer is depleting.
• -Payload information 2 payloads FTS and
  MAESTRO
• - FTS instrument is designed to simultaneously
  measure the
• temperature, trace gases, thin clouds, and
  aerosols found in the
• atmosphere during sunset and sunrise
  occultations.
• - MAESTRO will provide high-resolution data on
  the atmosphere
• and precise profiles of ozone
  concentration.

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1.2 Satellite Technical Information Launch Date
August 13, 2003 from Vandenberg Air Force
Base, California Launch Vehicule Pegasus XL
rocket Orbit 650 Km above the Earth
inclination 74 degrees Total Mass
150 Kg Transponder Alcatel Espacio S-Band 5
watts output Spacecraft Contractor Bristol
Aerospace, Winnipeg, Man., CANADA Scientific
Payloads ACE-FTS (Bomem Ltd, Québec,
Canada) Maestro (MSC, U of Toronto and
EMS) On-Board Mass Memory 1.5 GBytes (1 GBytes
EOL)
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Section 2 PREVIOUS CSA SUPPORT TO OTHER AGENCIES
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Section 2 Previous CSA Support to other Agencies

• Agreements have been signed to share the TTC
  facilities with the following Space Agencies on a
  "quid pro quo" basis CNES, DLR and ISRO
• List of CSA support over the past few years, and
  coming ones
• CNES
• Hélios 1B (LEOP) Dec 1999
• Ariane 5 (Envisat Launch) March 2002
• SPOT 5 (LEOP) May 2002
• Ariane 4 (SPOT 5 Launch) May 2002
• Hélios 2A Dec 2004
• DLR
• Eutelsat EW5 Nov 2002
• TerraSAR-X Spring 2006

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Section 3 SCISAT-1 LEOP SUPPORT REQUIREMENTS
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Section 3 SCISAT-1 LEOP Support Requirements

• 3.1 Constraints and Challenges
• -Cost to be held to a bare minimum very small
  budget allocated.
• -Very limited time for preparation,
  implementation and
• verification of the external TTCS
  Network.
• -Documentation to be kept to the strict minimum
  due to the
• tight schedule, shortage of
  personnel and very limited budget

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Section 3 SCISAT-1 LEOP Support Requirements

• 3.2 LEOP First Orbits Visibility
• Requirements
• -Real time TM for at least once per orbit for
  the
• first 2 orbits.
• -Real time TM and commanding capabilities for
• orbits 3 to 5 inclusive.
• -Real time TM and commanding capabilities for
  all
• orbits over at least one of the two CSA
  stations located
• in St-Hubert and in Saskatoon.

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Section 3 SCISAT-1 LEOP Support Requirements

• 3.3 Stations Selected and Coverage
• Selection Criteria
• Sufficient visibility to confirm S/C State of
  Health, stable attitude, power positive status
  and commanding capability
• Cost
• Existing technical capabilities available at the
  station
• Stations selected
• CNES Hartebeeshoek Station Located near Pretoria
  in South Africa. This station was selected
  primarily due to its visibility to the S1
  spacecraft roughly 45 minutes after launch.
• DLR Weilheim Station Located in Weilheim
  Germany selected due to the its excellent
  visibility for the first S1 orbits
• ISRO Mauritius Station Located on the island of
  Mauritius and selected due to its overlapping
  mask with Hartebeeshoek.
• ISRO Bangalore Station Located in India and was
  selected due to its overall visibility and the
  fact that it is the ISTRAC S/C Control Centre

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Section 3 SCISAT-1 LEOP Support Requirements
SCISAT-1 FIRST 8 ORBITS
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Section 4SCISAT-1 TM/TC
Section 4 SCISAT TM/TC
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Section 4SCISAT-1 TM/TC

• 4.1 TC/TM Format and Specifics
• TC and TM in CCSDS format
• TC
• - 4 kbps PM/PSK/PCM
• -16 kHz subcarrier
• TM
• - LEOP 500 kbps QPSK
• - Emergency 40 kbps QPSK
• - Routine Operation 500 kbps, 1, 2
  and 4 Mbps QPSK
• - Data is randomized and RS encoded
• - For all rates except the emergency
  rate (40 kbps) pre-modulation
• filtering using a
  Square-Root-Raised Cosine Filter with a roll-off
  of
• .35 is used

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Section 4SCISAT-1 TM/TC

• 4.2 Stations Compatibility Testing
• Constraints
• - No RF suitcase with transponder available
• - TM tests only with loopbacks of SCISAT-1
  recorded telemetry
• Compatibility Tests
• - TC TM Loopbacks using pre-recorded
  SCISAT-1 files
• - TLE processing
• - QPSK Tracking, Demodulation Doppler
  measurement validation
• using a real satellite (Jason)

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Section 4SCISAT-1 TM/TC

• DLR (Weilheim)
• - No equipment installation required
• - Compatibility tests (2 days) held in April,
  2003
• CNES (Hartebeeshoek)
• - Installation of (1) Enertec 3801-20, TCP/IP
  routers and voice over I/P equipment was
  installed in May 2003
• - Compatibility tests (2 days) held in May,
  2003
• ISRO (Mauritius Bangalore)
• - Software changes to ISRO Enertec 3801-20
  were implemented for compatibility with CSA
• - TCP/IP Routers and voice over I/P equipment
  was installed in April and May 2003
• - Compatibility tests (2 days) held in April
  2003, for Bangalore
• - Compatibility tests (2 days) also in May
  2003, for Mauritius

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Section 5 DATA AND VOICE INTERCONNECTION
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Section 5 Data and Voice Interconnection

• 5.1 Voice and Data Network Requirements
• TCP / IP based network.
• Operate with digital dial-up lines ( ISDN ) to
  reduce overall costs.
• VOIP to be used for HBK, Bangalore and Mauritius
  stations. Black phone to be used with DLR.
• Capable of filtering back-orbit CCSDS Virtual
  Channels and transferring range rate data via
  TCP/IP network.
• Provide an interface to the ITOS real-time
  satellite control system.
• Permit the maintenance and debugging of equipment
  at the HBK, Bangalore and Mauritius stations from
  St-Hubert.

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Section 5 Data and Voice Interconnection

• 5.2

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Section 5 Data and Voice Interconnection

• 5.2 Voice and Data Network Stations
  Configuration
• Hardware
• TCP/IP Routers and VOIP equipment provided by CSA
  for Bangalore, Mauritius and HBK.
• Enertec 3801-20 provided to HBK by CSA.
• Enertec 3801-20 provided at Bangalore and
  Mauritius by ISRO.
• DLR Provided all necessary hardware for S1
  supports.

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Section 5 Data and Voice Interconnection

• 5.2 Voice and Data Network Stations
  Configuration
• Software
• Mission specific software developed to interface
  ITOS to the Enertec 3801-20 hardware using PFLP
  (C).
• Software developed in Python to playback Virtual
  Channel data from Enertec in HBK, Bangalore and
  Mauritius.
• Specific software modifications made to Weilheim
  interface by DLR to support Avtec PTP-NT (LEO-T)
  look-alike interface to the ITOS system.

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Section 6 SCHEDULE
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Section 6 Schedule

• 6.1 LEOP NETWORK STATIONS IMPLEMENTATION SCHEDULE

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Section 7 OVERALL PERFORMANCE / ACKNOWLEDGEMENTS
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Section 7 Overall Performance / Acknowledgements

• 7.1 TTC Stations performance
• - Excellent support was provided by all
  stations.
• - Despite the tight schedule the work at
  stations such HBK,
• Bangalore and Mauritius, where additional
  equipment needed to
• be installed and tested, was completed
  only in a few days. All the
• work was mainly done during the single visit
  from CSA personnel at
• each station just a few weeks before launch.
• Special Thanks to CNES, DLR , ISRO and CSIR
  (HBK station)
• The LEOP requirements were met
• - Received TM during first 2 orbits from HBK
  and Mauritius
• -TM and TC capabilities used over Weilheim
• -TM and TC capabilities used over both CSA
  St-Hubert and
• Saskatoon stations

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Section 7 Overall Performance / Acknowledgements

• 7.2 Data and Voice Interconnection Performance
• -ISDN Lines
• Excellent reliability. All TM/TC transferred
  without any problems
• -VOIP connection
• Excellence performance even if equipment
  required initialization prior to each contact.