Inlämning av Examensarbete / Submission of Thesis

Muhammad Kamran Saleem MEE07:06, pp. 95. TEK/avd. för telekommunikationssystem, 2007.

The work

Författare / Author: Muhammad Kamran Saleem
mksa05@gmail.com
Titel / Title: Electrostatic Forces for Swarm Navigation and Reconfiguration
Översatt titel / Translated title: Electrostatic Forces for Swarm Navigation and Reconfiguration
Abstrakt Abstract:

In this study, we have developed a navigation scheme for a swarm of satellites equipped with both
electrostatic and conventional actuators. The main features of two new concepts for formation
flying control i.e. electrostatic actuation, used for active control of spacecraft charging for
relative position control and equilibrium shaping, which is a behavior based swarm navigation
technique are highlighted in this study. The work described in this report is divided into two
main sections.
In the first section, the propulsion system is investigated. The GEO region is selected for this
study since, the Debye length is sufficiently high in this region and a model of the interaction
between plasma and a charged spacecraft is derived. On the basis of this result the requirements
for the hybrid propulsion system are defined and a new charge control strategy with two currents
i.e. charging and stabilizing current is proposed. The stabilizing current Ist counteracts
the natural environmental currents and drive the spacecraft potential toward zero and charging
current is emitted with the acceleration voltage of desired potential level and drives the spacecraft
to desired potential level in certain range. The candidate propulsion system consists of a
radio frequency ion thruster engine (RIT) and an electron gun for emission of charges from the
spacecraft.
In the second phase of the study the applicability of the electrostatic actuation for formation
keeping and reconfiguration of swarms of satellites is considered. The recently developed equilibrium
shaping navigation technique has been selected to control the maneuvers of the swarm.
There is a specified set of formations that can be acquired in an autonomous way by means
of the ES technique and a specified set of formation can be maintained only relying upon the
EA concept. The compatible formations are those that can be acquired autonomously relying
upon the ES path planning scheme and maintained using only the EA. These formations enjoy
both a high level of autonomy, ensured by the equilibrium shaping, and high fuel efficiency,
provided by the electrostatic actuation. Exploiting the results on the compatibility, the electrostatic
interaction between the SC has been considered to increase the efficiency of acquisition or
reconfiguration maneuvers. In particular it has been demonstrated that the electrostatic force
can be used to reduce the fuel expenditure of the whole swarm.

Ämnesord / Subject: Telekommunikation - Telecommunications
Fysisk planering - Spatial Planning\Communications
Signalbehandling - Signal Processing
Nyckelord / Keywords: Spacecraft Formation Flying, Coulomb Satellites, Hybrid Propulstion System

Publication info

Dokument id / Document id:
Program:/ Programme Magisterprogram Telekommunikation och Signalbehandling/Masters progr. Telecom & Signal Proc.
Registreringsdatum / Date of registration: 03/16/2007
Uppsatstyp / Type of thesis: D-Uppsats/Magister/Master

Context

Handledare / Supervisor: Prof. Dr.-Ing. Hans Jürgen Zepernick
hans-jurgen.zepernick@bth.se
Organisation / Organisation: Blekinge Institute of Technology
Institution / School: TEK/avd. för telekommunikationssystem
S-371 41 Karlskrona
+46 455 38 50 00
I samarbete med / In co-operation with: ZARM Center of Applied Space Technology and Microgravity Germany
Anmärkningar / Comments:

004917665711021

Files & Access

Bifogad uppsats fil(er) / Files attached: thesis.pdf (5066 kB, öppnas i nytt fönster)