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<title>AAS 98-203</title><body BGCOLOR="ffffff"> <h2>AAS 98-203</h2> <h2>SIMPLE CONTROL LAWS FOR LOW-THRUST ORBIT TRANSFERS</h2> <h4>C. A. Kluever - University of Missouri-Columbia/Kansas City</h4> <h2> Abstract </h2> The maturation and successful demonstration of solar electric propulsion (SEP) technology will enhance the need for practical guidance and control laws for long-duration SEP orbit transfers. This paper presents several simple control laws for performing a variety of orbit transfers for SEP spacecraft. The control laws are developed by investigating the nature of the governing equations of motion. The result is a set of control laws that are simple functions of the spacecraft's current state. Numerical examples for a variety of orbit transfers are presented. <P><A HREF="http://www.space-flight.org/AAS_meetings/1998_winter/sessions.html">Back</A>