FICHE SED26 A4•OK - Sodern

SED26STAR TRACKERThe SED26 is the most recent version of theSED16 product line. It combines the advantageof an already flight proven design withmost up to date enhancements.The SED26 uses only ITAR free parts, whichsimplifies its implementation on any type ofmission. it operates in worst case of Spaceenvironment like peaks of Large Solar flares or15 years cumulated dose in GEO. Otherupgrades have been integrated in the designto reduce costs and lead-time while still buildinga robust product.The SED26 with class “S” parts was firstflown in April 2005 to ensure the attitudecontrol of a 15 years GEO spacecraft. Theperfect behaviour of this product onboardthis satellite and following flights, added tothe already extensive SED16 flight experiencesince May 2002, makes the SED26 thebest and most affordable choice for highreliability, high robustness and high accuracycompact autonomous star trackers.ITAR FreeAutonomousVery RobustFlight Proven LEO/GEO

HIGH ACCURACY AUTONOMOUS ATTITUDE SENSORThe SED26 provides all the features of a modern autonomous star trackerinherited from its predecessor the SED16. Its compact and low weight packageis designed with the highest quality standards and provides ultimate robustnessand reliability for long duration space missions.• On SED26, several improvements have been implemented:- A detection module designed for high shock loads- Improved algorithms and software to maintain the tracking in worse caseconditions of Solar flares and SAA• Attitude accuracy (full performances @20°C - 3σ - EOL):- Cross boresight axes: 3 arcsec LFE: 5 arcsec/√Hz NEA- Boresight axis: 15 arcsec LFE: 25 arcsec/√Hz NEAOTHER PERFORMANCES• Autonomous Attitude Acquisition in less than 3 seconds• Attitude tracking:- With 10 stars simultaneously- Update rate up to 10Hz• Robustness:- Operating with Moon and Planets in FoV- Tracking robust to motion rate up to 20°/s- Tracking robust to acceleration up to 10°/s 2- Acquisition with up to 3000 protons/cm 2 /s- Tracking up to 24000 protons/cm 2 /sENVIRONMENTAL CARACTERISTICS• Temperatures:- Full performances -20°C to +50°C- Operating -30°C to +60°C- Storage -40°C to +70°C• Mechanical loads:- Random 25 grms (30° baffle)- Random 20 grms (25° baffle)- Shock 1500 gSRS @2 KHzMECHANICAL INTERFACESThe SED26 is housed in a single box in aluminium, with lineof sight either parallel or perpendicular to base plate, onwhich two types of baffle can be mounted :• 3.1 kg, 160x170x290 mm 3 (with 30° baffle)• 3.3 kg, 160x170x350 mm 3 (with 25° baffle)ELECTRICAL INTERFACES• Power average @20°C: 7,5 W• Power average @40°C: 9 W• Output data: MIL1553B (RS422 option)• Power supply: 20V–50V (50V–100V option)RELIABILITY AND LIFETIME• Space level 1 (class “S”): 850 FIT @30°C• Space level 2 (class “B”): 2500 FIT @30°C• Latch-up free and immune to Single EventEffect• Designed for 18 years lifetime in GEOPhotos: © “Alcatel”, “SODERN” - Printed in France by PUBLICO (F91230) - 06/2006Because of constant improvment to our product, specifications are subject to change without notice.20, avenue Descartes94451 LIMEIL-BREVANNES CEDEX FRANCETel.: +33 1 45 95 70 71 - Fax: +33 1 45 95 71 77E-mail: space@sodern.fr - http: //www.sodern.com