2. SATELLITE
COMMUNICATION
A satellite is an object that orbits another object . The
term is often used to describe an artificial satellite.
A communications satellite is an artificial satellite
stationed in space for the purposes of
telecommunications using radio at microwave
frequencies.
3. INTRODUCTION
In 1962, the American telecommunications giant
AT&T launched the world's first true
communications satellite, called Telstar.
Then, countless communications satellites have been
placed into earth orbit, and the technology being
applied to them is forever growing in sophistication
5. ORBITAL PATERN
GEO: The most common type of communications satellites,
particularly the broadcast satellites like AfriStar, Intelsat,
PanAmSat, Eutelsat and ASTRA etc., are in geosynchronous
orbit.
MEO: A medium Earth orbit (MEO) satellite is one with an
orbit from a few 100 miles to a few 1000 miles above the
Earth's surface.
LEO: A low Earth orbit (LEO) satellite system consists of a
large number of satellites each in a circular orbit at a constant
altitude between 320 and 800 km.
6. SATELLITE COMMUNICATION
IN MILITARY
Military satellite communications (or milsatcom) systems are
typically categorized as wideband, protected, or narrowband.
7. WIDE BAND GAPFILLER
SATELLITE
The Wideband Gap filler Satellite program will produce
generation of wideband communications for the Defense
(DOD).
8. ADVANCED WIDE BAND
SYSTEM
Defense Systems Agency and Joint Staff indicate that a
global wideband satellite communications can excess of 15
megabits per second will be needed by the middle of the
next decade.
The Advanced Wideband System will take advantage of the
commercial and government technology advances of the
first half of this decade to meet expected needs. Laser
crosslinks, space- based data processing and routing
systems, and highly agile multibeam/phased- array
antennas will most likely be included
9. PROTECTED
COMMUNICATION
Protected systems have the ability to avoid, prevent, negate, or
mitigate the degradation, dis unauthorized access, or
exploitation of communications services by adversaries or the
environment protected systems include the Advanced
Extremely High Frequency System and Advanced.
10. NARROW BAND
COMMUNICTION
In the past, the term "narrowband" implied data rates of less
than 64 kilobits per second, but boundary could apply in the
future as higher data rates to small terminals become possible.
11. ACCELERATING CAPABILITY
In early fiscal year 2002, DOD initiated a Transformational
Communications Study to accelerates delivery of advanced
capabilities with state-of-the art technology to the field.
12. APPLICATIONS
Amateur radio
- Access to OSCAR satellite.
- Low earth orbits.
Internet
- High Speed.
- Useful for far away places.
Military
- Uses geostationary satellites.
- Example: The Defense Satellite Communications System
(DSCS).
13. CONCLUTION
Future satellite communications cannot prescind
from the evolution of terrestrial broadcast and
broadband communication systems.
By using this the communication in military will be
improved
