This open source projects contains the AMPL models for a number of
optimal control problems (OCP) of relevance to space engineering. All models
are converging using the default parameters provided and using the default
solver provided.

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To run the models the following external (commercial) dependencies are needed:

1 - AMPL (also the edition limited to 100 variables is enough)
2 - SNOPT (in its AMPL version). Alternatively one could try other solvers (open source) by	changing the relative line in the model file.
	
Most models output the result in a text file whose format is controlled by printf statments.

As an alternative, on-line free services such as the NEOS server can be used (in which case the .mod files could need some small 
modification to be adapted to the web interface)
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The following folder/files are included in this distribution:

lander/:
	Folder containing OCP transcription for a planetary lander dynamics
lander/impulsive/:		
	Folder containing OCP impulsive transcription for a planetary lander dynamics
lander/impulsive/main_thrusters.mod: 
	Model for the OCP of a planetary descent (attitude dynamics actuated by thrusters)
lander/impulsive/main_reaction_wheel.mod:
	Model for the OCP of a planetary descent (attitude dynamics actuated by a reaction wheel)
lander/impulsive/main_simple_model.mod: 
	Model for the OCP of a planetary descent (attitude dynamics excluded)
lander/hs/:
	Folder containing OCP Hermite-Simpson (HS) transcription for a planetary lander dynamics
lander/hs/main_thrusters.mod: 
	Model for the OCP of a planetary descent (attitude dynamics actuated by thrusters)

dock/:
	Folder containing OCP transcription for docking type of problems (essentially those based on Hill-Clohessey-Wiltshire equations)
dock/main.mod
	Model for the OCP of a simple two dimensional docking problem with a basic  attitude actuation. 

misc/:
	Miscellanea problems that could be used as tutorials
misc/lambert_problem/main.mod:
	Model transcribing a simple lambert problem (i.e. a two point boundary value problem)
misc/dubins_car:
	Folder containing different transcriptions for the classical Dubins Car Optimal Control Problem
misc/dubins_car/tr/main.mod:
	Model transribing the OCP for the Dubins Car using a Trapezoidal collocation method
misc/dubins_car/hs/main.mod:
	Model transcribing the OCP for the Dubins Car using an Hermite-Simpson collocation method      
misc/dubins_car/impulsive/main.mod:
	Model transcribing the OCP for the Dubins Car using an impulsive collocation method	
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