Change search
ReferencesLink to record
Permanent link

Direct link
Optimal thruster actuation in high precision attitude and orbit control systems
2005 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The increasing demand for high precision spacecraft attitude and orbit maneuvers puts very strict requirements on thrusters and their control. Best suited for this task are proportional thrusters able to produce precise micronewton thrust levels with very little noise. Such thrusters under current development are cold gas microthrusters, field emission electric propulsion (FEEP), colloid thrusters and micro-resistojets, with ion engines and Hall thrusters having attractive properties should a miniaturization be possible. Optimal utilization of proportional thrusters can be achieved by minimizing the 1-norm, 2-norm or infinity-norm of the thrust command vector, resulting in a minimum flow rate controller, a minimum power controller or a minimum force controller respectively. The first and last are found by solving linear programs, the middle by using the pseudoinverse of the thruster configuration matrix along with a bias. The control authority, which is the maximum performance of a thruster system, can be found by maximizing the force and torque output. A single number, referred to as the minimum control authority, measures the weakest output of the thruster system. All of these concepts are given a thorough review, and the thesis rounds off by implementing them on the LISA Pathfinder mission. Calculations show the algorithms to work well, but a more efficient way of finding the minimum control authority is desirable.

Place, publisher, year, edition, pages
Keyword [en]
Technology, thrusters
Keyword [sv]
URN: urn:nbn:se:ltu:diva-58112ISRN: LTU-EX--05/310--SELocal ID: eb0ca6d1-8b05-4db0-a73b-0c80e1485debOAI: diva2:1031500
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Open Access in DiVA

fulltext(1356 kB)0 downloads
File information
File name FULLTEXT01.pdfFile size 1356 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

ReferencesLink to record
Permanent link

Direct link