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University of Kansas

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Iridium Satellite System

Low earth orbiting satellite system

True pole-to-pole coverage

66 Satellites in orbit

Altitude of 780 Km

Minimum elevation angle – 8.2 0  

Average satellite view time – 10 minutes

Access Scheme – FDMA and TDMA

Maximum number of users – 80 users per a diameter of 318 Km

Low cost availability for research purposes ( NSF sponsored)

Data communication features

Type of data services – Iridium-to-PSTN, Iridium-to-Iridium

Throughput – 2.4 Kbps, primarily intended as a voice only system

Cannot support most of the data communication requirements of polar research

Not practical to be used as a main stream/ life-line communication system

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