23-11-2012, 02:11 PM
SATELLITE PHONE
SEMINAR ON SATELLITE PHONE.pptx (Size: 3.16 MB / Downloads: 37)
WHAT IS SATELLITE PHONE?
Satellite phone is a mobile telephone which communicates using satellites instead of using cell towers.
COMPARISION WITH CELLULAR PHONE:-
Can be used in remote areas.
Bigger in size.
Cost call is expensive.
It can’t be used every places.
Locations banning satellite phones:-
North Korea
India - Proper permission required .
Cuba
Libya
Syria
Burma
IMPORTANT TERMS RELATED TO SATPHONE COMMUNICATION:-
Satellite Constellation:- consists of 48 LEO (low-Earth-orbiting) satellites, plus an additional four satellites in orbit as spares. The satellites are placed in eight orbital planes of six satellites each, inclined at 52 degrees to provide service on Earth from 70 degrees North latitude to 70 degrees south.
Satellite Footprint:-
The signal from a satellite is normally aimed at a specific area called footprint
Path Diversity
Path diversity is a method of signal reception that combines multiple signals of varying power strengths into a single coherent signal.
CONCLUSION:-
The call path of the satellite phones is disaster free . Provides global coverage.
Not as popular as the cellular phones probably because of the high cost of the calls.
Research is going on in order to decrease call cost so that satellite phone becomes a common man’s phone.