/efos

REALOP FOS

Primary LanguagePython

Flight Operating System (FOS)

  • A micro ‘virtual operating system’.
  • Enables autonomous determination, control and operation of the CubeSAT.
  • Enables seamless shifting between the different modes of the satellite.
  • Allows for communications with uplink and downlink capability.
  • Allows for software patches to be sent.

Changelog

  • vAlpha - Triad, IGRF, MPU, PID and ESC code added. Some utils and tests added.
  • v0.1 - Logging, Modes, Uplink/Downlink, Image Queueing and Shell capabilites added. Code structure better defined.

Modules used

  • pigpio
  • numpy
  • pyIGRF
  • math
  • datetime
  • time
  • signal
  • logging

Structure

.
├── communications/
├── config/
├── control_systems/
├── core/
├── determination/
├── tests/
├── modes/
├── unused/
├── fos.py
└── README.md

Features

UNIX Shell

Subteam - CS

  • Allows access to the terminal on the flight computer.
  • Can easily send patches, as shell and python scripts.
  • Gives us a way to make changes to the satellite software in orbit, should anything go wrong.

Progress - Basic version completed, more features like custom commands could be added.

PID

Subteam - CS

  • Widely in control systems of autonomous robots
  • Helps in adjusting the satellite to account for unforseen variables and improve accuracy of control systems.

Progress - PID code needs to be verified and tuned.

Global Logging

Subteam - CS

  • One logging system throughout the OS
  • Multiple levels of logging
  • Logs will be sent with data packets and not stored permanently, helping free up memory.

Progress - Logging system is defined, needs to implemented throughout each class. Log flushing needs to be completed.

Uplink & Downlink Capability

Subteam - CS, Electrical & ConOps

  • Interfaces with the flight computer and allows smooth transfer of data packets over the satellite antennas.
  • Data Packets include telemetry data, logs, images, telemetry and messages. Each data packet estimated to be around 0.5 MB maximum.
  • Uplink Capability to take in data from the ground and execute commands through the shell, or perform different functions

Progress - Downlink Capability needs to be coded with the flight computer. Need to figure out what do we exactly need to uplink, currently executes shell code.

Modes & Mode Switching

Subteam - CS & ConOps

  • Different Modes for the different missions as well as control of the satellite
  • Helps in autonomous decision making based on determination data and switching modes.
  • Enables us to conduct multiple experiments like the Imaging and HDD testing autonomously.

Progress - Imaging Mode is defined, other modes need to be discussed, finalized and defined. Mode Switching needs to be thought of.

Autonomous Image Queueing

Subteam - CS

  • Automatic queueing of images based on percentage of black pixels in the image.
  • Ensures that the pictures with most of Earth in it to be sent first.

Progress - Code complete, and partially tested, needs to be integration tested.