When you are talking about control systems like this they normally will have two processor board based imbedded systems per function being monitored.  These are communicating back to a couple of redundant  systems that manage the data flow and then send data on to the communications systems (redundant again) that deals only with the communications to ground control.  All systems are configured to be redundant to N+N, so if you have two system running in a redundant fashion then there would be two additional system running in redundant fashion.  With the number of systems this required it necessitates the use of single board processors optimized to run with RAM disks and minimal ancillary hardware.
 
Answer is that this is done all the time and NASA has this down to an art form.

From: kclug-bounces@kclug.org [mailto:kclug-bounces@kclug.org] On Behalf Of Brian Kelsay
Sent: Monday, December 17, 2007 8:13 AM
To: kclug
Subject: Re: Linux on a Saturn V?

Quick answer, yes, it could.  Long answer, maybe, it's not as easy as you think. 

A lot of what's complicated about space-flight software is that it must be automated and more importantly it must be timed just right.  Linux or any other SpaceFlight OS is going to need to monitor fuel burn rate, thrust and altitude.  It will need to monitor and control gimbals on the engines, various consumable stores and other instrument based readings.  It will need to make decisions based on these readings and not get locked up or confused.  It will need to be able to transmit all these readings back home and send some radio signals or change frequency at minimum when key decisions are made.  These are to let ground control know what is going on when they are not in control or too far away to make quick changes.  The further away the craft is, the longer it takes to send a command.

Can it do it, definitely yes.   But each craft and mission is different.  I'd bet that they want the hard real time Linux for this.


On Dec 17, 2007 6:40 AM, Oren Beck <> wrote:
Ok- this a question of "could it ever ?"

Several folks have proposed  American funding for Big  Dumb Boosters.
Think a cloned only slightly updated Saturn V. Problem being that NASA has made "Lawn Ornaments" of all the unused ones they had, then shredded or burned all the project docs.
Which included ***ALL** known copies of the software. So even if that mythical "found one complete in a warehouse" scenario were true...  We would have to recreate software not only to fly the bird, but to support it. That is quite likely the same level of complexity as writing code for ANY such giant rockets.  If we copy a Saturn V or make the not yet hatched Saturn VI.
 Thus it becomes viable to consider Linux and it's ancillary tool sets

Then again - would you ever be able to find enough coders in any other STABLE viable OS?


--
Oren Beck
816.729.3645