Thursday, April 14, 2022

General Mission Analysis Tool (GMAT) Introduction



GMAT

Some links for General Mission Analysis Tool (GMAT) for easy access. GMAT is a free tool provided by NASA for engineers to design trajectories and perform orbit determination. This page presents a general overview of GMAT as well as some lessons learned for my own benefit. 

The most fundamental capability of GMAT is to propagate, or simulate the orbital motion of, spacecraft. The ability to propagate spacecraft is used in nearly every practical aspect of space mission analysis, from simple orbital predictions (e.g. When will the International Space Station be over my house?) to complex analyses that determine the thruster firing sequence required to send a spacecraft to the Moon or Mars.

Some basic understanding of orbital mechanics will be VERY HELPFUL. Please consult an astrodynamics book to build a foundation. GMAT is not a replacement for actually having this aerospace knowledge.

The full tutorial starts at Chapter 5 on the GMAT page. Assuming you're using the 2020 version, you can find the link as such after you install the software: http://gmat.sourceforge.net/docs/R2020a/html/Tutorials.html

Basic Assumptions

WIP

Links


User Guides

Downloads

Friday, April 8, 2022

Map Tie Errors

Map Tie Errors

Introduction

Localizing surface features relies on understanding offset between different references frames, i.e. map tie error. For instance, there is an offset between the Mars inertial and cartographic reference frames.

Links

For more assistance, the PDS Geosciences Node Community can offer some insight:
https://geoweb.rsl.wustl.edu/community/

For instance, some helpful links: