PID similar algorithm? If all analog components, PI and/or PID would have some interesting challenges to keep a long time period algorithm faithful. I see what you mean about your prior comment about knowing "how to make things work". You'd have to know the design & components physics/specs inside and out - especially for a space application.
Thank you for your service to our country.
Sounds like you know a bit about this stuff yourself. We did not call it a PID system, but that’s close. It was 44 years ago and things have changed a bit since then.
What we did was almost all analog, based on sensor input. The circuit itself provided automatic output control via feedback loops based on continuous analog sensor input. Optimal damping of system response in space was the difficult part, and that was built into the circuit itself. The output controlled satellite stability and had to be as efficient as possible.