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

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