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PonysatThis Project is an offspring of the AstroSat_Skywave Project. Indeed, during the last two years Spacesys was listening to the interest, shown by potential Users, of disposing of low-cost spacecraft for a variety of applications, most of which concerning medium-high resolution imaging for remote sensing applications. We then decided to reconsider how to move, from the platform that we designed for the AstroSat-SkyWave Project, towards a low-cost platform, mostly based on COTS, without degrading too much the performance. . The PonySat concept keeps many features already included in the AstroSat architecture, while others were drastically changed. The satellite structure consists of three modules : Service, Payload and , optionally, Propulsion, each module tailored to best fit stringent cost/performance ratios. At present a baseline project is being considered to test the adequacy and limits of the PonySat target specifications which are listed below: - shape: prismatic, 450 x 450 x 600 mm (baseline) with fold-out solar panels; - mass: 60 kg, o.o.m. (depends on payload and mission) ; - optional chemical (preferred) or electrical propulsion module; - four deployable solar panels with GaAs cells; - 180 W installed prime power (with GaAs cells) at normal incidence on solar panels; - 250 Wh, serial-parallel connected Li-ion battery (up to 25 % d.o.d.); - attitude: 3-axis stabilized with active control; - attitude sensors: fine sun sensors, 3 rate gyro and 3-axis magnetometer; optional star sensor; GPS receiver - control actuators: 3 magnetotorquers, 3 reaction wheels; - pointing accuracy: better than 0.1° (goal) for 95% of the orbit period (without high accuracy Star sensor) ; - communications: UHF amateur bands - S_band high data rate transmitter:for high data volume scientific or application payloads; - Data handling: OBC with modern processor and solid state memories; - memory size: variable, mission requirements dependent; - payload mass : up to 50% of total mass, propulsion excluded - payload DC power fraction: in the 30% to 50 % of the available prime power; - lifetime: 3 years nominal; |
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Copyright: SpaceSys , Via Etruria 47, 00183 Rome, Italy; Phone: : +39 0664821022 ; P.IVA: 10034621002 ; updated: April 2011 |
