Inmarsat communications system : a systems approach

170 Pages·1991·7.5 MB·en_US

by  Fasoulas, Aristides Ioannis.;Boger, Dan C.;Gates, William R.

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NAVAL POSTGRADUATE SCHOOL
Monterey, California
THESIS
INMARSAT COMMUNICATIONS SYSTEM:
A SYSTEMS APPROACH
by
Aristides Ioannis Fasoulas
June, 1991
Co-Advisor: Dan C. Boger
Co-Advisor: William R. Gates
Approved for public release; distribution is unlimited.
T256871

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Naval Pstgraduate School AS Naval Postgraduate School
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Monterey, CA 93943-5000 Monterey, CA 93943-5000
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11 TITLE (Include Security Classification)
INMARSAT COMMUNICATIONS SYSTEM A SYSTEMS APPROACH
12 PERSONAL AUTHOR(S)
FASOULAS, Aristedes
13a TYPE OF REPORT 13b TIME COVERED 14 DATE OF REPORT (Year,Month, Day) 5 PAGE COUNT
Masters Thesis FROM TO 1991 June 160
16 supplementary notation The views expressed in this thesis are those of the
author and do not reflect the official policy or position of the Depart-
ment of Defense of the US Government.
17 COSATI CODES 18 SUBJECT TERMS (Continue on reverse if necessary and identify by block number)
FIELD GROUP SUB-GROUP Satellite communications; International
satellite communications; INMARSAT; Satellite
vulnerability
19 ABSTRACT (Continue on reverse if necessary and identify by block number)
This study describes the history of satellite communications from its
beginning to the current date and explains the major components of
satellite communications. It describes the satellite communicat ions
technology, and identifies some of its problems such as speech echo,
data transmission, and digital network synchronizat ion It deals with
.
U.S. military and international satellite communications systerns, and
especially with Inmarsat. It also presents the possible threats for a
satellite communications system and discusses how to deal with them,
Finally, it introduces some conditions and technical considerations of
the Inmarsat system in the Hellenic environment and provides some basic
information for choosing a satellite system from an economic point of
view.
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Dan C. Boger 408-646-2607 AS/Bo
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Approved for public release; distribution is unlimited,
Inmarsat Communications System:
A Systems Approach
by
Aristides I. Fasoulas
Lieutenant Commander, Hellenic Navy
B.S., Hellenic Naval Academy, 1976
Submitted in partial fulfillment
of the requirements for the degree of
MASTER OF SCIENCE IN TELECOMMUNICATIONS SYSTEMS
MANAGEMENT
from the
NAVAL POSTGRADUATE SCHOOL
/June 1991
Department of Administrative Sciences
11
ABSTRACT
This study describes the history of satellite
communications from its beginning to the current date and
explains the major components of satellite communications. It
describes the satellite communications technology, and
identifies some of its problems such as speech echo, data
transmission, and digital network synchronization. It deals
with U.S military and international satellite communications
systems, and especially with Inmarsat. It also presents the
possible threats for a satellite communications system and
discusses how to deal with them. Finally, it introduces some
conditions and technical considerations of the Inmarsat system
in the Hellenic environment and provides some basic
information for choosing a satellite system from an economic
point of view.
in
II
TABLE OF CONTENTS
INTRODUCTION
I. 1
BACKGROUND
A. 1
B. OBJECTIVES 1
ORGANIZATION
C. 2
II. DEVELOPMENT OF SATELLITE COMMUNICATIONS 4
A. HISTORICAL BACKGROUND 4
B. SATELLITE COMMUNICATIONS TECHNOLOGY 6
1 Basic Concepts of Satellite Communications Systems 6
.
a. Satellite RF-Link 7
b. Communications Subsystem 8
(1) Communications Repeater 9
(2) Communications Antenna 12
c. Communications Satellite (spacecraft) 14
(1) Spin Stabilization 17
(2) Three Axes Stabilization 17
d. Earth Station 18
(1) Earth station antenna 18
(2) Receivers 21
(3) High power amplifier 23
IV