TABLE OF CONTENTS Trajectory simulations abound. Government agencies have spear headed general-purpose simulations, and aerospace companies have developed specialized models. Yet, not all simulations are readily available. Many military simulations are classified, and industry keeps their source code under wraps, away from the competition. Some simulations are available to the public, occasionally at a nominal fee.
To give you an overview, I have assembled the synopsis of four popular simulation environments. If you want to get more information, you should use the contact point cited at the end of each profile.
TRAP is a general-purpose missile fly-out program with a shooter and aircraft target model.
Degrees-of-freedom: three-DoF point mass, three-DoF pitch, three-DoF yaw, five DoF, six DoF
Equations of motion: Reference B. Etkin, Dynamics of Atmospheric Flight, Wiley; singularity at vertical climb or dive
Inertial reference frame: flat Earth
Aerodynamic model: alpha, beta table look-up
Propulsion: rocket, turbojet, and ramjet
Autopilot: many options acceleration feedback, rate feedback, torque balance, etc.
Guidance: pro-nav, pursuit, three-point guidance
Sensors: infrared; passive, semi-active and active radar
Integration: Adam Bashforth second-order trapezoidal predictor (new state calculated from current derivative and past state and derivative); transfer function integration by Tustin z transform; integration interval is 0.01 s
Communication: via common blocks stored in INCLUDE files
Performance reconstruction: determines unknown flight parameters by minimizing the sum of squares of the difference between given and simulated trajectories
Launch envelop generator: vertical and horizontal planes
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