Ansys Systems Tool Kit (STK) is an indispensable digital mission engineering application for the aerospace, defense, telecommunications, and other industries. It features an accurate, physics-based modeling environment to analyze platforms and payloads in a realistic mission context.

With STK, you can analyze the performance of complex systems with a focus on their operational environments. Model systems inside a realistic and time-dynamic three-dimensional simulation that includes high-resolution terrain, imagery, RF environments, and much more. Select, build, or import precise models of ground, sea, air, and space assets and combine them to represent existing or proposed systems. Simulate the entire system-of-systems in action, at any location and at any time, to gain a clear understanding of its behavior and mission performance.

For over 30 years, STK has brought the mission into systems engineering.

STK License Options


The foundation for analyzing and visualizing complex systems in the context of their missions.

STK Premium (Air)

Advanced analytical tools and higher fidelity modeling in the air domain.

STK Premium (Space)

Advanced analytical tools and higher fidelity modeling in the space domain.

STK Enterprise

The most comprehensive digital mission engineering software package, anywhere.

STK Specialized Extensions

STK Scheduler

Optimize task scheduling for any type of space system.


Model and simulate satellites and their subsystems.

STK Missile Tool Kit

Simulate powered missile trajectories, intercept engagements, and defense system performance.

Transform Your Digital Engineering

Start with a scenario. The scenario is the sandbox of STK's digital mission engineering environment.

Add models of your systems. Your models can range from low-fidelity stand-ins to full-fidelity simulators. Use your STK scenario to evaluate all your models and their interactions continually throughout the program life cycle.

Analyze your systems in their full mission context. Evaluate all their characteristics — from the position and orientation of individual objects (in any reference frame) to the relative geometry between objects — and their physics-based interactions.

Communicate and decide. Prepare reports and graphs from tens of thousands of measurements in STK. Put it all on display with compelling, precise, 2D and 3D renderings and animations. Leave nothing to the imagination.

Product Images

Image from STK Components, Global Hawk
Image from STK Radar, Arleigh-Burke Class Destroyer
Image from SSA Software, International Space Station
Image from STK Astrogator, AGI
Image from STK Aviator, F-35 JSF
Image from STK Missile Tool Kit, ICBM
Image from STK Optimizer, AGI
Image from STK Urban Propagation, AGI
Image from STK Urban Communications, AGI