trajectory modeling in the flight path coordinate system - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Software Libraries (/forum-10.html) +--- Forum: HP Prime Software Library (/forum-15.html) +--- Thread: trajectory modeling in the flight path coordinate system (/thread-19257.html)

trajectory modeling in the flight path coordinate system - cdeaglejr - 12-05-2022 11:01 AM This HP PPL program demonstrates how to model the trajectory of an aerospace vehicle in the flight path coordinate system. This example flies an STS maximum cross range re-entry trajectory using angle-of-attack and bank angle information extracted from a trajectory optimization program. The initial flight path coordinates can be defined by the user according to the following example. Please note the units of each input. // -------------------------------------- // define initial flight path coordinates // -------------------------------------- // altitude (kilometers) xalt := 121.92; // relative velocity (kilometers/second) vrel := 7.80288; // geographic declination (degrees) dec := 0.0; // geographic longitude (degrees) elon := 0.0; // azimuth (degrees) azim := 90.0; // flight path angle (degrees) fpa := -2.39780555815067; The final simulation time, in seconds, can be set by the user in line 180 of the source code. // final simulation time (seconds) tf := 1000.0; The software and documentation for this program can be downloaded at https://www.dropbox.com/s/nj4kpk4kowlqj6i/demo_fpeqms.zip?dl=0