ROBUSTA cubesat Radiation On Bipolar University Satellite Test Application Student project Partnership : Montpellier University + CNES 1
What is Robusta Robusta s goal Robusta s actors Robusta s location (where is Montpellier) Robusta s partner the CNES 2
What is Robusta? a large scale educational project for attracting students towards scientific careers A satellite entirely concieved and realized by students A real scientific experience 3
ROBUSTAs Actors Technological Institute Nîmes Engineering school Montpellier Masters degree Montpellier Institut d Electronique du Sud + 150 students from 1st univ year to Ph.D. About 20 university teachers 4
ROBUSTAs Actors University Montpellier Experience subs. Engin. School Montpellier Controller subs. Technol. Institute Nîmes Mechanics Technol. Institute Nîmes Power subs. University Montpellier Radio subs. University Montpellier Ground station 5
Website http://www.ies.univ-montp2.fr/robusta 6
The CNES offers: Financial support Technical support Training courses CNES partnership 2006: EXPRESSO Call for proposal: student projects in the field of orbital systems and stratospheric balloons Doctoral and post doctoral grants Students are required to follow standard project management process 7
ROBUSTAs mission Why How Facts 8
The SUN Solar winds and flares emission of particules (radiations) towards Earth The first solar flare was observed by the britannic astronome Richard Carrington, the 1st of september 1859 9
Radiation in space Solar radiations Cosmic radiations Radiation belts 10
Superb Radiation effects Aurora : best known effect of trapped charges in the magnetosphere 11
AnnoyingRadiation effects Solar wind and Flares impact on the reliability of on board electronics Trapped by the magnetic field electronic failures on satellites Example of particle flux calculated with AE8max Model 12
Space Electronics: typ. problems Fact: impossible to repair satellite after launch Companys use COTS RADIATION hardness assurance (RHA) Need to test components at ground 13
Typical problems linked to radiation hardness tests Tests should reproduce in a few weeks the effect of irradiation at a mission scale (15 years of mission ) Test too conservative: Rejection of useful components Lack of test. Till 1991, bipolar technology based components considered immune to radiations Test non adapted Test for bipolar techno. derived from tests MOS techno. 14
Heart of mission Accelerated test method for BJTs proposed by Test reliability? ROBUSTA s mission Data measured with accelerated on ground test method Data measured during flight If results converge Validation If not Revision of méthod Doctorate cofinanced by the CNES and the CNRS 15
Robusta s payload Integrated Circuits: 2 LM139 and 2 LM12 Data measured 16 Currents + 8 Voltages for 2 biases Temperature Dose: Quantity of radiations received on satellite Use of new OSL dosimeters developped in Montpellier all subjects for our students to study 16
Vega: Launcher VEGA January 2008: call for proposal from ESA for place on Maiden Flight. ROBUSTA wins amongst 27 european projects Life Time: elliptic orbit 354 km 1 447 km 2,5 years 1447km: Robusta enters the radiation belts 71 : Numerous passages in the SAA Ideal orbit for mission 17
Dose calculation FastradTM software Sectorial analysis: estimation of dose received for each critical device Ex: Adjustments of the wall thickness for shielding purpose 18
Latchup threat management SAA Heavy ions fluxes Heavy Ion may trigger parasitic structures in CMOS ICs Delatch circuitry used on all µ-controllers
Conclusion Complete education program involving as many students as possible Conception of embarked measurement test mechanics, electronics orbital calculation, simulations management, communication plan A strong organisation - Payload attractive to the scientific community - Attractive project for students -A real success 20
Thanks to Thanks to Radio-amateur Texas Instruments And also Intersil TRAD SAFT COFIDUR Farnell 21