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\title{Designing Optimal Low-Thrust Interplanetary Trajectories Utilizing Monotonic Basin Hopping}
\author{Richard C.}{Johnstone}
\otherdegrees{B.S., Unviersity of Kentucky, Mechanical Engineering, 2016 \\
			  B.S., University of Kentucky, Physics, 2016}
\degree{Master of Science}{M.S., Aerospace Engineering}
\dept{Department of}{Aerospace Engineering}
\advisor{Prof.}{Natasha Bosanac}
\reader{Kathryn Davis}
\readerThree{Daniel Scheeres}

\abstract{  \OnePageChapter

	Much work has been performed recently to utilize the increasingly viable technology of
	low-thrust electric propulsion systems on missions of interplanetary scope. This thesis analyzes
	a technique for designing trajectories for spacecraft with a low-thrust propulsion system that
	also use natural gravity flybys for missions to the outer planets. Often, the goal is to find
	feasible solutions that also minimize propellant mass requirements. First, locally optimal
	solutions are constructed by using an interior-point linesearch algorithm, along with multiple
	shooting techniques for optimization. Then, Monotonic Basin Hopping is utilized to traverse the
	search space, improve the local optima determined by the internal optimizer, and determine the
	global optima. This approach allows for a medium-fidelity, fully automated global optimization
	of the low thrust controls and flyby parameters for a given target destination. As an
	application of this method, two sample trajectories to Saturn are analyzed.

}

\dedication[Dedication]{
	\begin{center}
		I'd like to dedicate this work to anyone with an interest in space.

		We're all exploring this together.
	\end{center}
}

\acknowledgements{	\OnePageChapter
	I owe just about everything that I am today to the circumstances that I grew up in and in no
	area of my life is that more apparent than in my loving family. I'd like to thank them for
	providing me with the emotional support I needed to grow confident in my own abilities and the
	logistical support I needed to nurture my curiosities.

	I'd also like to thank my girlfriend, Rachael, for supporting me through this process. This has
	not been an easy time for me, and I owe a lot to your support this past year.

	Finally, I'd like to give a huge thanks to Dr. Bosanac, who provided me with the structure I
	needed to stay on track, the motivation I needed to really get the most out of this paper, and
	the guidance I needed to finish this up. It's no exxageration to say that this thesis wouldn't be
	written to anywhere near the level of quality it was without you.
}

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	\input LaTeX/trajectory_design.tex

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	\input LaTeX/results.tex

	\input LaTeX/conclusion.tex

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