Satellite operation on eseo’s (european students earth orbiter) oper team example.
Students’ Space Association Warsaw University of TechnologySatellite operation on ESEO’s (European Students Earth Orbiter) OPER team example. Artur Łukasik
Plan of the presentation:ESEO Satellite (overview)Mission Objectives and specificationMain space segment characteristicsGround segment main tasksOperations planning softwareHigh Priority Commands andEmergency Operations
ESEO SatelliteOne of ESA’s ‘’Hands-On’’ Educational projects.About 20 teams from all over the Europe4 Polish teamsESEO satellite has the followingmission objectives To take pictures of Earth from the orbit for educational outreach purposes To provide measurements of the plasma and radiation environment in Earth orbit and space plasma measurement in Earth orbit To test new technologies for future education satellite missions Exploitation by radio-amateur community after the end of operative phase
Mission Objectives and specification:Mission technological objectives:Test of Micro Camera Device (uCAM)Test of Reaction WheelTest of Star TrackerMission main scientific objectives:TriTel-S three-dimensional DosimeterLangumir plasma diagnostic probeThe LET (Linear energy transfer) spectra of the cosmicradiation, the absorbed dose and dose equivalentThe electron density and electron temperature
Main space segment characteristics:Time-tagged commandsSchedule for up to 5 days in advanceESEO SW (software), three different on board schedulers areforeseen. In detail they are: Satellite TC scheduler: dedicated to general purpose planned operations Payloads TC scheduler: dedicated to payloads operations (e.g. acquisition, calibration, configuration) and telecommands for ACS (Attitude Control System) target pointing manoeuvres. Contact Table schedulerThe schedulers can be managed by telecommands from theground segment. The following operations are allowed: Commands can be added in the scheduler. The scheduler can be suspended (disabled) and resumed. All commands from a certain time stamp upwards can be removed A single command can be disabled
Ground segment main tasks:The ESEO Ground Segment will perform the following main tasks: monitor and control the ESEO satellite during all the phases of the mission, both in nominal and contingency conditions; receive users request and elaborate a Mission Planning accordingly; receive Payload data, process it and make it available to users; handle on board software maintenance, updating and patching; evaluate and predict spacecraft dynamic behavior; manage Satellite and Payload databases manage and coordinate the different Ground Stations.
Operation planning process (part1): Nominally plan updates – every day During weekends and holidays reduced up to one time per three days Ground segment team working 1 shift a day, five days a week. Two ground stations: GS North( in Europe) - satellite monitoring, data download and routine maintenance operations and GS South (in New Zealand) – uploading operation plan1. The baseline plan containing the routine operations for satellite monitoring, control and maintenance.2. Payload data aquisition requested by users.
Operation planning process (part2):- System timeline:Collecting users RequestsChecking requests for consistency with respect to theoverall system constraintsThe operation plan is then harmonized. A baselineOperation Plan is generated. And splited into two parts: The satellite operation plan The ground station operation plan (time of contacts, antenna pointing angles, etc.)The plan follow up is returned to the Users to providethem with feed-back information
Operation planning process (part3):- System timeline (continued):The frozen operation plan is converted by the MissionControl Centre, into the corresponding time taggedtelecommands listThe telecommand list is then uploaded to the satelliteby the TMTC (Telemetry-Telecommand) stationThe satellite executes the time tagged telecommands toget the payload data and store them onboardThe data remains stored on-board till it can bedownloaded according to memory management andsatellite contactsData are downloaded and received by the groundstation
High Priority Commands & Emergency Operations:List of the HPC foreseen for ESEO satellite is:Switch to OBDH (On Board Data Handling) Main sectionSwitch to OBDH Redundant sectionReset active OBDHWatchdog reset (Necessary to avoid automatic change of OBDH section)ON/OFF commands to S-Band transmitterReset TMTC (Telemetry-Telecommand unit)Emergency operations will define at least the following tasks:Identification of the problem.Use of simulation tools (simulators, satellite elements engineering model) fortesting the recovery procedures.Generation of the plans for dealing with the recovery actions.Execution of contingency procedures.Verification of the recovery.Restart of the routine operations.
Thank you for your attention! Artur ŁukasikFinancial Officer of Students’ Space Association email@example.com +48 504 998 074