This document is the introduction to a seminar presentation on satellites. It provides an overview of the key topics that will be covered, including the definition of a satellite, the history of satellites, the components of a satellite, how satellites orbit Earth and how they work, different types of satellite orbits and bands, and applications of satellite technology. The presentation aims to give attendees a foundational understanding of satellites and their role in communication systems. It will examine both passive and active satellites, the layers of the atmosphere, and generalized satellite communication systems.

1. A
Seminar on
INTRODUCTION TO SATELLITE
Presented By
SWAPNIL G. THAWARE
20100764
Under the Guidance of
Prof. HIVRE S. R.
Dr. Babasaheb Ambedkar Technological University,
Department Of Information technology Engineering
LONERE-402 103
2011-2012

2. CONTENTS :
What’s mean by satellite ?
History of Satellites :
Layer Of Atmosphere :
Generalized communication system :
What are the components of a satellite?
 How Satellites Work ?
 How do satellite stay in orbit ?
Why satellite are launched 36,000 Km from centre of earth ?
Types of bands :
Types of orbits :
Global position system :
Advantages And Disadvantages Of satellite :
Uses of satellite :
References :

3. what’s mean by sATELLITE ?
Passive Satellites Active satellites
I. Natural satellites
II. artificial satellites.
 A passive satellite only
reflects received signals back
to earth.
 Ex.moon is a natural satellite
of earth
 Active satellites are
complicated structures
having a processing
equipment called
Transponder .
 An active satellite acts as a
REPEATER
A Satellite is a solid object which revolves around some
body due to the effect of gravitational forces OR
a satellite is an object which has been placed into
orbit by human endeavour.

4. History of Satellites :
 First satellite that was used
for communication
purpose in INDIA was
-ARYABHATTA (19 April
1975)
 The first geostationary
communication satellite
-SYNCOM 3(19 Aug 1963).
 Father of geostationary
communication satellite is
-HAROLD ROSEN
(Aircraft engineer)
The world's first artificial satellite is the Sputnik 1
was launched in 1957

5. Layer Of Atmosphere :
 TROPOSPHERE :
STRATOSPHERE :
MESOSPHERE :
THERMOSPHERE :
EXOSPHERE :

6. INFORM
ATION
SOURCE
Uses of
inform
ation
TRAN
NSMI
TTER
Recei
ver
Channel
1 2 3 4
1= Message signal.
2 = tranmitted
signal.
3 = received signal.
4 = message signal.
Generalized communication system :
NOISE OCCUR

7. What are the components of a satellite?
 Many satellites are
powered by
rechargeable
batteries.
 Small thrusters
provide attitude i.e.
stabilize the satellite's
position in space.

8. How Satellites Work :
I. A Earth Station
sends message in
GHz range (Uplink).
II. Satellite Receive and
retransmit signals
back. (Downlink)
III. Difference between
Downlink and
Uplink frequency is
2 GHz.

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