First results and next steps in Kazakhstan Earth Observation missions in cooperation with SSTL M.Moldabekov (1), M.Nurguzhin (2), V.Ten (3), S.Murushkin (3), H.Lambert (3), A.da Silva Curiel (4), D.King (4), H.Kadhem (4), G.Taylor (4), M. Sweeting (4) (1) Kazcosmos, Republic of Kazakhstan (2) KGS, Republic of Kazakstan (3) Ghalam LLP, Republic of Kazakhstan (4) SSTL, United Kingdom April 22nd 2015
Contents Background KazEOSat-2 specifications KazEOSat-2 status KazSTSAT programme KazSTSAT specifications KazSTSAT status Conclusion
Background The cooperation between the SSTL, KGS, and Ghalam companies started with the KazEOSat-2 mission currently in the final phases of commissioning The follow-up programme is carried out by a joint British-Kazakh project team, and is focused on technology demonstration along with provision of wide-swath multi-spectral imagery This KazSTSAT spacecraft will feature a brand new avionics suite and a number of technology demonstration units provided by Ghalam.
KazEOSat-2 specifications Based on the flight proven SSTL-150 platform RapidEye heritage baseline Identical payload (5 channel MSI) Enhanced agility with the introduction of new 100SP wheels 2x data rate enabled with new a new high-speed data recorder and X-band antenna pointing mechnisms Better geolocation accuracy with new Rigel-L star trackers Increased power capabilities with triple-junction solar cells
KazEOSat-2 specifications Parameter Value Launch June 2014 (Dnepr) Operational lifetime, years 7 Weight, kg 180 Orbit LTAN 630 km SSO 10:30 GSD, m 6.5 Spectral channels 5 (blue, green, red, red-edge & NIR) Swath, km 77 Daily coverage km 2 1,000,000 Downlink rate, Mbps 160 Agility up to 35 off-nadir angle, 60 slew in 90 seconds Delta-V capacity m/sec > 30
KazEOSat-2 specifications Based on the flight proven SSTL-150 platform RapidEye heritage baseline Identical payload (5 channel MSI) Enhanced agility with the introduction of new 100SP wheels 2x data rate enabled with new a new high-speed data recorder and X-band antenna pointing mechnisms Better geolocation accuracy with new Rigel-L star trackers Increased power capabilities with triple-junction solar cells
KazEOSat-2 status In-orbit acceptance review next week Maximum throughput scenario has been verified in orbit MTF and SNR measured for all channels MTF > 16% SNR > 100 Agile modes tested one pass stereo and area imaging Geolocation verified Power profiles are in line with the predictions Reaction wheel failure Despite a reaction wheel failure the mission is still compliant with the system level technical requirements due to redundancy for full performance design philosophy Investigation ruled out all viable causes of the failure including Single event effects and mechanical problems Random component failure
KazSTSAT programme This spacecraft is jointly developed by a team comprising of Ghalam (a joint venture between KGS and Airbus Defence and Space) and SSTL engineers The KazSTSAT will be the first implementation of the new SSTL-X50 platform family using a next generation Fireworks avionics suite, and will carry a wide swath multispectral imager (SLIM-6-22) as a main payload a new technology demonstration on-board computer (OBC ARM) Below-Diffraction Limit imager experiment A heritage Airbus designed Sun sensor (BASS 17) will also be installed on the spacecraft for flight approval of the manufacturing process in Kazakhstan.
FIREWorks modules BCM PDM S-band Tx/Rx CAN bridge PIU X50 specific development Structure KazSTSAT X50 platform Propulsion subsystem Heritage SSTL modules OBC750 AIM (ADCS interface module) SGR-07 GPS receiver Rigel-L star tracker X-band TX (80Mbps) 10SP-M3 wheels, Magnetometers, Magnetorquers, Sun Sensors, S-band and GPS antennas
KazSTSAT X50 platform
KazSTSAT specifications Parameter Value Launch H2 2016 (Dnepr) Operational lifetime, years 5 Weight, kg 110 Orbit LTDN 580 km SSO 10:30 GSD, m 18.5 Spectral channels Swath, km 300 Daily coverage, km 2 3,600,000 Downlink rate, Mbps 80 6 (coastal UV, blue, green, red, rededge, NIR) Agility up to 30 off-nadir angle, 60 slew in 100 seconds Delta-V capacity, m/s > 16
End of Phase C CDR in May Start of AIT in August KazSTSAT Status
Conclusion KazEOSat-2 is at the end of commissioning Despite a few delays for technical and administrative reasons the mission is progressing towards the In-Orbit Acceptance Review The reaction wheel failure does not look like systemic and does not reduce any of the mission performances KazSTSAT is a unique experience because Joint British-Kazakh (50/50%) team working on the project A platform designed from scratch, and carrying experimental payloads Higher than usual risk profile that is considered acceptable for a non-operational mission that is expected to benefit future missions in terms of extended capabilities
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