This site aims to be a comprehensive guide to NOS3. We'll cover topics such as getting your NOS3 installation up and running, developing new simulators, and provide information on submitting issues and feature requests.

Click here for a PDF version of the User Manual.

So what is NOS3, exactly?

The NASA Independent Verification and Validation (IV&V) Independent Test Capability (ITC) team has developed a CubeSat named Simulation-to-Flight 1 (STF-1). The primary goal of this CubeSat is to develop and demonstrate the life-cycle value of a software-only small satellite simulator. This simulator is called the NASA Operational Simulator for Small Satellites or NOS3.

NOS3 is an open-source, software only testbed for small satellites licensed under the NASA Open Source Agreement. It is a collection of Linux executables and libraries. Current simulations are based on commercial off the shelf (COTS) hardware that is being used on the STF-1 CubeSat. It is intended to easily interface with flight software developed using the NASA Core Flight Software (cFS).