RECENT SPACE DEBRIS MITIGATION ACTIVITIES IN FRANCE F.ALBY
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1 RECENT SPACE DEBRIS MITIGATION ACTIVITIES IN FRANCE F.ALBY
2 GEO END OF LIFE WORKSHOP BACKGROUND Particularity of the GEO orbit: unique resource Need to protect and to keep available orbital positions Mitigation measures are necessary Rules are being prepared by agencies End of life operations already performed by some operators dialog between operators and agencies necessary workshop organized by CNES COPUOS-STSC, February 2010, Vienna 2
3 GEO END OF LIFE WORKSHOP OBJECTIVES OF THE WORKSHOP Objective 1: To inform operators on regulatory issues under preparation: to convince, to support, encourage their implementation to be prepared to future evolution Objective 2: to get feed-back from operators having performed end of life operations to highlight implementation difficulties to update the rules when necessary COPUOS-STSC, February 2010, Vienna 3
4 GEO END OF LIFE WORKSHOP Workshop took place on January 27, 2010 at CNES s Headquarters in Paris More than 60 participants represented: Administrations: French Ministry of Defence European space agencies: BNSC (STFC), CNES, DLR and ESA Satellite operators: Eumetsat, Eutelsat, France Telecom, Hispasat, Inmarsat, SES-Astra, Paradigm Services Launch operator: Arianespace Industry: Thales Alenia Space, EADS Astrium, Astrium Space Transportation, Satel Conseil, Atos Origin Insurance companies: Hiscox, AXA, Marsh University : Cranfield University, Université de Bretagne COPUOS-STSC, February 2010, Vienna 4
5 GEO END OF LIFE WORKSHOP Objective 1: information of operators and industry general overview of the situation in GEO: population, reorbiting practices regulatory issues discussed at different levels: Practical implementation of the UK s Outer Space Act: GEO satellites French law on space operations, technical regulations DLR Technical Standards and Implementation Practice Status of ISO standards development IADC guidelines and the GEO disposal orbit: key parameters, future scenarios, and collision risks COPUOS-STSC, February 2010, Vienna 5
6 GEO END OF LIFE WORKSHOP Objective 2: feed-back from operators having performed end of life operations Long Term sustainability of space activities Eutelsat model of the effective cross section of reorbited satellites Long term evolution of Telecom 2B Thales Alenia Space experience on propulsion during reorbiting operations Telecom 2C reorbiting operations Eurostar end of life operations and strategy Paradigm End Of Life Operations Experience Approach for Meteosat-6 re-orbiting COPUOS-STSC, February 2010, Vienna 6
7 GEO END OF LIFE WORKSHOP MAIN CONCLUSIONS The rate of successful disposal is slowly increasing: 29% in % in Legal systems are implemented to reinforce application Accurate estimation of remaining propellant is difficult: Different methods exist with different results and accuracy key issue to decide disposal operations Passivation is a complex process: Time limitation due to ground station visibility (drift orbit) Instability of attitude control due to gas bubbles in the propulsion lines Need to keep control until the end for electric passivation and satellite switch-off COPUOS-STSC, February 2010, Vienna 7
8 SPOT2 END OF LIFE OPERATIONS SPOT 2 launched by Ariane 4 on 21 January 1990 Earth observation satellite Heliosynchroneous orbit: altitude 825 km inclination 98 degrees Main characteristics: Mass 1900 kg dimensions: 2 x 2 x 4.5 m Solar panel span 8 m Hydrazine propulsion system 3-axis stabilization COPUOS-STSC, February 2010, Vienna 8
9 SPOT2 END OF LIFE OPERATIONS INTRODUCTION Objectives: Orbital lifetime lower than 25 years Passivation Experience Spot 1 November 2003 Initial orbit Perigee altitude : km Apogee altitude : km Hydrazin mass before de-orbiting: 60.3 kg COPUOS-STSC, February 2010, Vienna 9
10 SPOT2 END OF LIFE OPERATIONS First phase: STRATEGY Spot 2 orbit lowered 15 km below the operational orbit to avoid any collision risk with Spot 4 and 5 positioning of the apogee above the Toulouse ground station Second phase: a series of 8 apogee manœuvres ( 1000 s each) to decrease the perigee altitude Third phase: large last manoeuvre (2100 s) to decrease the perigee and to empty the tanks, passivation of the satellite COPUOS-STSC, February 2010, Vienna 10
11 SPOT2 END OF LIFE OPERATIONS KIR AUS KRU HBK KER COPUOS-STSC, February 2010, Vienna 11
12 SPOT2 END OF LIFE OPERATIONS FINAL STATUS Orbit: Perigee altitude: 570 km Apogee altitude: 796 km Remaining orbital lifetime: Between 23 and 25 years Telemetry confirmed fuel exhausted Battery disconnected Switch-off telemetry emitter COPUOS-STSC, February 2010, Vienna 12
13 TELECOM 2C END OF LIFE OPERATIONS Launched by Ariane 44L on December 6,1995 Geostationary orbit at 3 East longitude Built by EADS Astrium and Thales Alenia Space Mass at launch 2275 kg, solar panels span 22 m Mission: telecommunications, television Operated by CNES on behalf France Telecom COPUOS-STSC, February 2010, Vienna 13
14 TELECOM 2C END OF LIFE OPERATIONS SEQUENCE OF OPERATIONS Phase 0 (18 October 2009): beginning of operations, satellite upside down to optimize thrust efficiency Phase 1: exit from the GEO operational corridor: 1 apogee and 1 perigee manoeuvre to get out the GEO operational zone without crossing windows of neighbours circular orbit 70 km above GEO Phase 2: orbit raising sequence of apogee and perigee manoeuvres to progressively raise the altitude, IADC altitude obtained after 9 manoeuvres COPUOS-STSC, February 2010, Vienna 14
15 TELECOM 2C END OF LIFE OPERATIONS SEQUENCE OF OPERATIONS Phase 3: management of the tanks 8 additional manoeuvres Use of one pair of tanks until bubble detection Switch on the other pair of tanks when bubble detection Phase 4: passivation: Sun pointing attitude, use of thrusters to decrease pressure without attitude and altitude loss Phase 5: satellite switch-off COPUOS-STSC, February 2010, Vienna 15
16 TELECOM 2C END OF LIFE OPERATIONS FINAL STATE 17 East manoeuvres performed Duration of operations: 14 days (2 days off) 11.4 kg propellant mass Final orbit: 580 x 750 km above GEO Eccentricity propellant tanks empty Compliance with IADC guidelines COPUOS-STSC, February 2010, Vienna 16
17 TELECOM 2C END OF LIFE OPERATIONS Long term simulations Altitude au dessus of perigee de l'orbite géostationnaire and apogee altitude evolution pendant 50 ans altitude (km) date Ra-As Rp-As non interference with the GEO protected region 2058 COPUOS-STSC, February 2010, Vienna 17
18 SUMMARY As space agency CNES Prepares the Technical Regulations associated with French Space Act promotes the application of the guidelines: workshop in Paris with industry and operators Information on regulatory issues given by agencies Feed-back from the operators based on their experience As operator of national satellites CNES applies the end of life guidelines: to LEO satellites: SPOT 2 in July 2009 after SPOT 1 in November 2003 to GEO satellites: TELECOM 2C in October 2009 after TDF1 and 2, TELECOM 1A and C, TELECOM 2A and B COPUOS-STSC, February 2010, Vienna 18
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