Satellite operation on eseo’s (european students earth orbiter) oper team example.
1. Students’ Space Association
Warsaw University of Technology
Satellite operation on ESEO’s (European Students
Earth Orbiter) OPER team example.
Artur Łukasik
2. Plan of the presentation:
ESEO Satellite (overview)
Mission Objectives and specification
Main space segment characteristics
Ground segment main tasks
Operations planning software
High Priority Commands and
Emergency Operations
3. ESEO Satellite
One of ESA’s ‘’Hands-On’’ Educational projects.
About 20 teams from all over the Europe
4 Polish teams
ESEO satellite has the following
mission 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
4. Mission Objectives and specification:
Mission technological objectives:
Test of Micro Camera Device (uCAM)
Test of Reaction Wheel
Test of Star Tracker
Mission main scientific objectives:
TriTel-S three-dimensional Dosimeter
Langumir plasma diagnostic probe
The LET (Linear energy transfer) spectra of the cosmic
radiation, the absorbed dose and dose equivalent
The electron density and electron temperature
5. Main space segment characteristics:
Time-tagged commands
Schedule for up to 5 days in advance
ESEO SW (software), three different on board schedulers are
foreseen. 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 scheduler
The schedulers can be managed by telecommands from the
ground 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
6. 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.
7. 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
plan
1. The baseline plan containing the routine operations for
satellite monitoring, control and maintenance.
2. Payload data aquisition requested by users.
8. Operation planning process (part2):
- System timeline:
Collecting users Requests
Checking requests for consistency with respect to the
overall system constraints
The operation plan is then harmonized. A baseline
Operation 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 provide
them with feed-back information
9. Operation planning process (part3):
- System timeline (continued):
The frozen operation plan is converted by the Mission
Control Centre, into the corresponding time tagged
telecommands list
The telecommand list is then uploaded to the satellite
by the TMTC (Telemetry-Telecommand) station
The satellite executes the time tagged telecommands to
get the payload data and store them onboard
The data remains stored on-board till it can be
downloaded according to memory management and
satellite contacts
Data are downloaded and received by the ground
station
10. High Priority Commands & Emergency
Operations:
List of the HPC foreseen for ESEO satellite is:
Switch to OBDH (On Board Data Handling) Main section
Switch to OBDH Redundant section
Reset active OBDH
Watchdog reset (Necessary to avoid automatic change of OBDH section)
ON/OFF commands to S-Band transmitter
Reset 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) for
testing 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.
11. Thank you for your attention!
Artur Łukasik
Financial Officer of Students’ Space Association
gobbo@tlen.pl
+48 504 998 074