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Free and open source general mission analysis tool GMAT is a space trajectory optimization and mission analysis system developed by NASA and private industry in the spirit of the NASA Vision. GMAT contains new technology and is a testbed for future technology development.Put simply, the goal of the GMAT project is to develop new space trajectory optimization and mission design technology by working inclusively with ordinary people, universities, businesses, and other government organizations, and to share that technology in an open and unhindered way.NOTE: GMAT is licensed and distributed under the terms of the NASA Open Source Agreement. Here are some key features of "GMAT": Open Source Architecture: · provides ability for anyone to develop and validate new algorithms · enables new algorithms to quickly transition into high fidelity code · encourages maximum review of code and algorithms · allows unlimited number of machines with GMAT installations Platform Independence: · · runs on Mac, Linux and Windows (Mac and Linux are in alpha form, Windows is in beta form) Global epoch synchronization of spacecraft: · naturally synchronizes epochs of multiple vehicles · shortens run times by avoiding fixed step integration or interpolation to synchronize epochs of spacecraft Coupled propagation of multiple spacecraft: · provides unique modeling capabilities of coupled systems of spacecraft · improves performance and simulation run times Inline Math using MATLAB’s syntax: · uses industry standard language to maximize compatibility and minimize learning curve. · enables users to add their own calculations and parameters · supports user defined matrices, variables, and strings · supports matrix algebra in script language Nonlinear Programming: · makes defining cost and constraint functions trivial by built-in commands that allow rapid exploration of trade space. · allows analyst to turn constraints on and off easily, to determine how their inclusion or exclusion effects solutions. · permits constrained optimization of numerous classes of problems. High fidelity orbit propagation: · permits modeling of numerous flight regimes with high accuracy modeling · uses models standard in the industry Boundary value solvers: · solves two point boundary value problems using iterative methods Script and GUI interface: · · employs one-to-one mapping between script and GUI interface. · teaches users how to use the script syntax, through a GUI to script translator. Impulsive and Finite Maneuver Models: · permits modeling of spacecraft maneuvers · permits minimization of fuel expenditure Reports, 2-D, and 3-D plots: · provides report and graphical output so analyst can develop insight into problem trade space · allows data to be exported to other systems Control flow: · permits system flexibility to simulate new and unanticipated problems · enables convenient automation of routine tasks MATLAB interface: · provides access to industry standard analysis system and users' existing routines · provides an ability to calculate parameters not supported by current GMAT system Coordinate systems: · supports standard coordinate systems used in mission analysis · permits user to input, output data in useful coordinate systems. · supports coordinate system dependent parameters naturally in inline math statements. Built in orbit related parameter calculations: · allows users to plot and report relevant orbit parameters for problem insight and understanding · allows user to use orbit parameters in inline math to generate new parameters not supported internally by GMAT

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