3 Operational Modes

1. Startup
2. Emergency
3. Mission Mode

Reasons we may go into emergency mode:

• ADCS pointing mechanism not working properly
• Weather
• GPS/TLE/RTC data is misaligned
  • Don’t have proper positioning information
• RFFE or CC1120 board gets fried
• Radiation bit flip in cc1120 register

Startup Mode

• 5 minutes of radio silence
  • Handled by CDH startup process
• First contact
  • Turn on Receive mode and wait for connection request from ground station
  • Activating Receive mode is part of CDH startup process

Emergency mode:

• If satellite has not received messages in 48 hours, it should enter emergency mode
  • Handled by cdh and/or comms (if command manager goes 48 hours without receiving anything, signal to comms to switch to emergency mode)
  • Signalling can be handled by either cdh or comms
  • Emergency mode module should be handled by comms
• Redo cc1120Init()
• Satellite will start to accept unencrypted commands
• If normal power levels: send a connection request every 90 seconds and then switch to receive mode to wait for ground station response
  • wish list: develop RX sniff mode to save power
• Ground station should send the data and a reset command after connection request is received or 90 seconds into the pass over if no connection request is received
• TODO: figure out how costly doing a system reset is (If we’re in emergency mode for too long do a system reset?)