Abstract
The technical parameters of Motorola's iridium communications system are discussed. This system is a worldwide, digital, satellite-based, cellular, personal communications system primarily intended to provide commercial, low-density, portable service via handheld, mobile or transportable user units, employing low-profile antennas, to millions of users throughout the world. Calls can be made and received anywhere in the world with a personal, pocket-size, portable unit. A constellation of small (700 kg), smart satellites are internetted to form the network's backbone. Small, battery-powered, cellular-telephone-like user units communicate directly to the satellites. >
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