Manuel Martinez-Sanchez

Thesis Supervisor6
Edward M Greitzer2
Harold Y Wachman2
6Thesis Supervisor
2Edward M Greitzer
2Harold Y Wachman
2Ray Sedwick
Learn More
  • Vadim Khayms, Manuel Martinez-Sanchez Professor, Thesis Supervisor, Manuel Martinez-Sanchez, M Martinez-Sanchez, Mcmanus +5 others
  • 2009
Microsatellite technology has become increasingly popular in recent years as it can offer significant cost savings, higher reliability, and is generally more affordable for a large variety of commercial applications. Since many microsatellite missions require considerable propulsion capabilities, miniaturization of the propulsion subsystem is critical in(More)
Hall thrusters have become a tempting alternative to traditional chemical propulsion systems due to the great mass savings they provide through high specific impulses. However, a major stumbling block to their widespread integration is uncertainty about the thruster plume's interaction with spacecraft components. While in-space data is difficult to collect,(More)
Submitted to the Department of Aeronautics and Astronautics in partial fulfillment of the requirements for the degree of Master of Science in Aeronautics and Astronautics Magnetoplasmadynamic, or MPD, thrusters are a promising method of propulsion for a variety of different space missions. This research develops and analyzes a numerical simulation of a(More)
A full Particle-In-Cell code, written by James Szabo [23], was used to model a 50W TAL and 3kW SPT thruster. This code treats single and double ions, neutrals and electrons as particles, moved forward by a leapfrog algorithm at each timestep, matching the lowest of the plasma and the cyclotron times. At the end of each timestep, a successive-over-relaxation(More)
Plume diagnostic instruments were developed and the BHT-200 Hall thruster plume was characterized in order to support ongoing computational plume models. The instruments included a Faraday probe to measure current density, a hot emissive probe to measure plasma potential, and a cold Langmuir probe to measure electron temperature and electron density. Plasma(More)
The Electric Thruster Environmental Effects Verification experiment (ETEEV) is designed to obtain in-space measurements in the plume and backflow regions of low-power thrusters. The ETEEV payload will be installed on a Hitchhiker-palette onboard the Shuttle and will use plasma diagnostics mounted on the palette as well as on an articulated boom. Other(More)
For a typical satellite constellation design problem, sometimes there are two conflicting goals. On one hand one wishes to provide continuous coverage of a particular area. On the other hand one would like to use the minimum number of satellites as possible. For coverage locations nearer the equator, these requirements are easily fulfilled by using a(More)
Differential geometry provides mechanisms for finding shortest paths in metric spaces. This work describes a procedure for creating a metric space from a path optimization problem description so that the formalism of differential geometry can be applied to find the optimal paths. Most path optimization problems will generate a sub-Riemannian manifold. This(More)
  • Tye Brady, B S Aerospace Engineering, Manuel Martinez-Sanchez, Roland Vanderspek, Greg Huffman, Bob Dill +4 others
  • 2009
Ground stations are crucial elements in the success of a satellite mission. With the shift in spacecraft design to provide increased autonomy, the ground station design will also undergo a similar paradigm shift. This thesis describes one such ground station design, which supports the HETE-II (High Energy Transient Explorer) mission. The effort described(More)