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Santa Maria Groundstation

Validation and Support to Ariane-5 ATV

OPS-G Forum

Gerhard Billig

15 July 2008

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Agenda

1. Groundstation Validation2. Infrastructure3. Operational Setup and Preparations4. Launch Operations5. Outlook

- Upgrade of Perth groundstation- Support to other Launcher families

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Groundstation Validation- Internally Tested Subsystems -

• Tracking Tests with Caltower / Satellites• Dedicated Autotrack Tests

• Monitoring and Control• TM reception and processing

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Autotrack Validation

• Angular velocity of launcher (as seen from the groundstation) was much higher than that of satellites

• Autotrack (dual frequency) was mandatory and primary mode of tracking

• Aircraft was chosen as carrier for transmitters• Trajectory was down-scaled to meet aircraft constraints:

• Height: ≈ 1200m

• Speed: ≈ 200km/h• Placement of antennas and power connection was difficult

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Track of Ariane-5 over SMA• 1st pass:

Min Slant Range: ≈ 180km at elevation 48°

• 2nd pass: Min Slant Range: 1100 km at elevation 10°

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Actual Flightpath

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Antenna positioning in aircraft

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Equipment Installation

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SMA Infrastructure Development: Original View

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Finalised Installation at SMA

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Inauguration

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Operations Preparations and

Launch Support

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Requirements for Launch Support from SMA

• Tracking: Dual-frequency AutotrackDO-Programtrack

• TM Reception and Storage• TM Extraction and Forward to CSG• Event Detection and Forward• Voice Communications

Comms

Acores

Voice

S-band

CSG/Kourou

TM Receiver

Voice

TM (CVI)

Pointing (DO)

Antenna Control

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Ariane-5 ATV: Mission Overview

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Ariane-5 ATV Tracking Network - Drivers -

• Mission Duration: 1.5 Orbits (0.5 orbits for GTO)• Long Cruise Phases complicate accurate orbit prediction

(Ariane inertial platform sensors)

• Inclusion of Radars at Europe resolved predication accuracy problems

• ISS was used as tracking target to exercise network-wide tracking campaigns

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Santa Maria Groundstation: Schedule for Operations

• March 2007: Meeting with CNES/CSG• May 2007: Operational Training with CNES• October 2007: Operations KoM with CNES at SMA

Start of Operational Preparations• November 2007: Stand-Alone Tests• January 2008: Operational Qualification with CNES• February 2008: Mission Readiness Tests (internal)• 9th March 2008: Launch of Ariane-5 ATV

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Outlook: Upgrade of Perth groundstation

-90

-60

-30

0

30

60

90

-180 -150 -120 -90 -60 -30 0 30 60 90 120 150 180

Ariane 5-ECA+Fregat

Soyuz+Fregat

CAR

NAN

KSH

PERT

REDUAUS

ACO

BAT

KRUBAN

TRI

KRN

-90

-60

-30

0

30

60

90

-180 -150 -120 -90 -60 -30 0 30 60 90 120 150 180

AR5 SSO

1500_sso

1200_sso

700_sso500_sso300_sso

PARE

MIG

PERT

SPIT

WAL

BER

STH

ANT

KRU

MASUOKI

DONG

KER

REF ELV

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Outlook: Support to other Launcher Families

• Vega SSO launch trajectory

• Vega Maiden Launch

• Soyuz