Mission Analysis Tools for Universities: STK, GMAT, FreeFlyer, and Web-Based Options

Universities running CubeSat programs face a practical question: which mission analysis tool should students learn and use? Here is a factual overview of the most common options and where each one fits.

STK (Systems Tool Kit)

STK from Ansys is the industry standard for space mission analysis. It offers deep modeling capability across orbits, access, sensors, communications, and more.

Strengths: breadth of features, industry adoption, extensive documentation. Considerations for universities: commercial licensing, Windows desktop installation, and a learning curve that can consume course time. (Free educational licenses exist under some programs.)

GMAT (General Mission Analysis Tool)

GMAT is NASA’s open-source mission design tool, strong on trajectory optimization and high-fidelity modeling, including deep-space missions.

Strengths: free and open source, flight-proven on NASA missions, scripting support. Considerations: a steeper learning curve for undergraduates, and a user interface that prioritizes function over accessibility.

FreeFlyer

FreeFlyer from a.i. solutions is a commercial astrodynamics platform used on operational missions, with strong propagation and scripting capabilities.

Strengths: high-fidelity propagation, mission operations heritage, flexible scripting API. Considerations: commercial licensing and desktop deployment, similar to STK.

Browser-based platforms

A newer category runs mission analysis entirely in the browser. Space Mission Designer (SMD) falls in this category: students define scenarios, propagate orbits with SGP4 or an Orekit-powered numerical propagator, compute ground station access, and check power and data budgets — with nothing to install.

Strengths: zero setup (works on any laptop or lab machine), modern interactive 3D visualization, fast iteration for early-phase design and coursework, free tier for students. Considerations: focused on CubeSat/SmallSat LEO workflows rather than deep-space trajectory optimization; less feature depth than STK for specialized analyses.

How to choose

A pragmatic approach many programs take:

• Early-phase design and teaching: a browser-based tool gets students propagating orbits in the first lab session instead of the fourth.
• Advanced courses and deep-space work: GMAT or FreeFlyer for trajectory optimization.
• Industry preparation: STK exposure remains valuable for students heading to large aerospace organizations.

These tools are complements, not mutually exclusive choices. SMD’s computations are continuously validated against STK reference data, so results from coursework translate directly to the tool graduates will meet in industry.

Try it in your course

SMD’s free plan includes 100 monthly computation credits — enough for student projects and coursework. Create a free account to evaluate it for your program.