SATELLITE ANTENNA By, S.Subhashini V.Pratheeba. SATELLITE A satellite is an artificial object which has been intentionally placed into orbit. Such objects.

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Presentation transcript:

SATELLITE ANTENNA By, S.Subhashini V.Pratheeba

SATELLITE A satellite is an artificial object which has been intentionally placed into orbit. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the moon. Satellites are used for a large number of purposes.

CONT…. Common types include Military & Civilian Earth Observation Satellites Communications Satellites Navigation Satellites Weather Satellites Research Satellites

ORBIT TYPES The commonly used orbits are  Low Earth Orbit (LEO),  Medium Earth Orbit (MEO)  Geosynchronous Earth Orbit (GEO)

ANTENNA USED IN SATELLITE Basically four main type of antennas are used: Monopoles and Dipoles (wire antennas) Horn antennas Array antennas (phased array antennas ) Reflector antennas

IRIDIUM SATELLITE SYSTEM The Iridium satellite constellation is a large group of satellites providing voice and data coverage to satellite phones, pagers and integrated transceivers over Earth's entire surface. The constellation consists of 66 active satellites in orbit, and additional spare satellites to serve in case of failure.

CONT.. The constellation of 66 active satellites has 6 orbital planes spaced 30 degrees apart, with 11 satellites in each plane. Satellites are in Low Earth Orbit at a height of approximately 781 km and inclination of 86.4°. Satellites communicate with neighboring satellites via Ka band inter-satellite links.

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CONT.. Each satellite can have four inter-satellite links:  two to neighbors fore and aft in the same orbital plane  two to satellites in neighboring planes to either side Each satellite completely orbits the earth in 100 minutes traveling at 16,832 miles per hour and from horizon to horizon it takes 10 minutes.

OVERVIEW OF IRIDIUM

IRIDIUM SATELLITE

IRIDIUM SATELLITE PHONE

THANK YOU