• Source: UPSat

UPSat was the first satellite manufactured in Greece to be successfully launched into orbit, by the University of Patras and Libre Space Foundation (an earlier Greek-made communications satellite, HELMARS-SAT, although entirely constructed by 1999, was not launched due to budget limitations). It was part of the QB50 mission with ID GR-02. The UPSat mission was the first satellite launched into orbit made entirely of open-source software and open-source hardware.




Open-source


The UPSat mission developed an open-source hardware and software 2U cubesat, minimizing the use of commercial off the shelf components, and providing hardware and software designs under the provisions of the CERN-OHLv2 and GNU-GPLv3 licenses respectfully. The vast majority of its components were designed from scratch in an open-source software and hardware way.




Mission



UPSat, as part of the QB50 cubesat constellation, was launched to the International Space Station at April 18, 2017 11:11 EDT at Cape Canaveral in Florida, on board an Atlas V rocket transferring the Cygnus cargo spacecraft to dock with the International Space Station with supplies and other scientific experiments. UPSat was released in orbit by the NanoRacks deployer from the International Space Station at 08:24 UTC 2017-05-18. After 30 minutes, UPSat subsystems commenced normal operations in orbit. The SatNOGS ground-station network began receiving telemetry signals from UPSat in several ground-stations deployed globally shortly after its deployment. All data and telemetry is publicly available. UPSat decayed at November 13, 2018.




Subsystems






= General

=

EPS (Electrical Power System)
An EPS designed from scratch around an STM32L1 MCU, utilizing software MPPT, harnessing power from 7 solar panels and having a 3-cell battery system.
OBC (On board Computer)
An OBC designed from scratch around an STM32F4 MCU, with software built around the FreeRTOS Operating System
ADCS (Attitude Determination and Control System)
An ADCS designed from scratch around STM32F4 MCU, determining attitude and position through sensor fusion (GPS, magnetometer, gyro, Sun sensor). The sensor fusion algorithm used is based on an alternative implementation of Wahba's problem, in order to accommodate gyro measurements, as introduced in. This implementation uses a virtual vector base, propagated by the gyro reading, fused with the vectors provided by the sun sensor and the magnetometer, as per Wahba's problem. This forms essentially a complementary filter in SO(3) between the gyro and the vector measurements. The reference vectors in ECI frame are calculated by and IGRF model, respectively, given the satellites position is known by the GPS and SGP4 model.
The control system is based on a spin torquer, which is used as a reaction wheel for pitch control and also to stiffen roll and yaw to the satellite's orbit plane (Gyroscopic torque and momentum bias). Magneto-torquers are also used to dampen the roll and yaw motion while also control pitch angle.
SU (Science Unit)
(see primary payload)
COMM (Communications system)
A COMM designed from scratch around an STM32F4 MCU, using the TI CC1120 transceivers, with contingency around TX operations combined with a custom Antenna deployment system with an integrated GPS antenna.
IAC (Image Acquisition Component)
(see secondary payload)
Structure
The structural sub-system is based on a "hybrid" approach of both aluminum (frame) and CFRP components (4 faces), built in-house.




= Primary payload

=
On-board UPSat, the primary payload, a science unit is integrated. The science unit (designed by the University of Oslo and supplied through the Von Karman Institute as part of the QB50 program) will be used for plasma measurements during the mission duration. The science unit is a multi-Needle Langmuir Probe (mNLP) instrument that works by measuring the current collected individually from four needle probes, placed in front of the satellite's shock front. The collected current is converted to voltage, filtered, digitalized and then sent to the central telemetry system.




= Secondary payload

=
As a secondary payload UPSat sports an embedded Linux board (DART-4460) running a modified version of the OpenWRT operating system controlling a b/w camera (MU9PM-MH) with 1 / 2.5’’ sensor size.




References






External links


UPSat mission website at the Wayback Machine (archived 25 January 2022)
UPSat repository on GitLab
• Source: UPSAT

UPSAT is a private higher education institution located in Tunis, Tunisia. Part of the Honoris United Universities network since 2018, UPSAT is also present in Sousse and Sfax.
The institute offers courses in the field of healthcare.




History


UPSAT specializes in paramedical training and has been recognized since 2002 by the Tunisian ministries of Higher Education and Health. The institution offers bachelor's and master's degrees, particularly in anesthesia, nursing, and medical radiology.
In 2019, UPSAT created a scientific day called "Pink October" dedicated to the prevention of breast cancer.
Since 2021, students have access to a career center located in Tunis, which helps students review their CVs and prepare for job interviews.




= Partnership

=
The institution partners with MSH International in Tunisia to train some of its students.
Since 2020, students have been able to practice at the Medical Simulation Center of Tunis. They train using medical equipment on mannequins and virtual reality headsets.
A partnership with Huawei was also announced in 2022.




= Ranking

=
In 2021, the Tunisian magazine Entreprises Magazine ranked the institution third in its ranking of the best healthcare schools in the country.




See also



Honoris United Universities




References






External links


Official website

Kata Kunci Pencarian:

• UPSat
• UPSAT
• Hellenic Space Agency
• Garmin
• List of open-source hardware projects
• CERN Open Hardware Licence
• SatNOGS
• List of CubeSats
• Honoris United Universities
• Institut maghrébin des sciences économiques et technologiques