05 global mobile satellite
DESCRIPTION
TRANSCRIPT
GLOBAL MOBILE SATELLITE SYSTEM
COMMUNICATION
INTRODUCTION
• ADVANCEMENT IN WIRELESS TECHNOLOGY
• NO MORE GEOGRAPHICAL ISOLATION
• EXTENSION IN EXISTING NETWORK• GLOBAL COMMUNICATION
FIRST MOBILE COMMUNICATION SYSTEM
• IN 1976 MARISAT SATELLITE WAS LAUNCHED
• COMMUNICATION BETWEEN SHORE AND SHIPS
• FIRST IRIDIUM SYSTEM IN 1997 IN LOW EARTH ORBIT
CLASSIFICATION OF MOBILE SATELLITE SYSTEM
• GEOSTATIONARY SATELLITE• QUASI-ZENITH SATELLITE• NON-GEOSTATIONARY SATELLITE
GEOSTATIONARY SATELLITE
• CIRCULAR ORBIT• ALTITUDE 36000KM• 3-4 SATELLITES ARE ENOUGH TO COVER
THE EARTH• THEY CAN SEE UPTO 42000KM • SATELLITE VISIBILITY 24 HOUR• SATELLITE LIFE 20-30 YEARS• SATELLITE CONSTELLATION COST LOW
QUASI-ZENITH SATELLITE
• CIRCULAR ORBIT AT 45 DEGREE TO EQUATOR
• ALTITUDE 36000KM• ONE SATELLITE FIXED NEAR
ZENITH IN JAPAN• 3-4 SATELLITES ARE REQUIRED
NON-GEOSTATIONARY SATELLITE
FURTHER CLASSIFICATION
1. HIGHLY ELLIPTIC ORBIT(HEO)
• ALTITUDE 40000KM• ORBITAL PERIOD 8-24 HOUR• 2-3 SATELLITES REQUIRED• LARGE PROPAGATION DELAY• SATELLITE LIFETIME 20-25 YRS• SET-UP COST IS LOW
2.MEDIUM EARTH ORBIT (MEO)
• ALTITUDE 10000KM-20000KM• ORBITAL PERIOD 6-12 HOUR• 10-15 SATELLITES REQUIRED• SATELLITE VISIBILITY 2-4 HRS• PROPAGATION DELAY LESS• SET-UP COST IS MEDIUM
3. LOW EARTH ORBIT
• ALTITUDE 500-2000KM• ORBITAL PERIOD 5-8 HOUR• 48 AND ABOVE SATELLITES
REQUIRED• SATELLITE VISIBILITY 10-20M• SATELLITE LIFE IS 4-10 YEARS• SET-UP COST IS MUCH HIGH
SOME LEO SYSTEM
• IRIDIUM SYSTEM
• GLOBALSTAR SYSTEM
• TELEDESIC SYSTEM
IRIDIUM SYSTEM
GLOBALSTAR SYSTEM
TELEDESIC SYSTEM
MEO SYSTEMICO SYSTEM
SERVICES
• HIGH BANDWIDTH• INEXPENSIVE• UNTETHERED COMMUNICATION• SIMPLE NETWORK TOPOLOGY• VIDEO CONFERENCING
Thank you
• Prepared by:-Jigar.P.Patel• Roll no:-20• Class:-sybba(itm)sem-4• Collage:-cppatel&fhshah
commerce collage