What's the difference between oneweb communication satellite and Iridium project?

Number of satellites: 648 small satellites to low orbit of 1200 km.

Orbit height: 750 miles (about 1207 km)

Satellite weight: about 285 lbs/piece.

Cost: USD 350,000/piece

The estimated cost is $1.50-200 million, and it is expected to be put into use in 20 19. OneWeb has the right to use several specific radio spectrum, mainly in Ku band.

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Iridium project

Iridium travels in an orbit of 780 kilometers, passing through the North Pole and the South Pole. In addition to 1 1 satellite, there are 1 to 2 satellites in each orbit as backup. Iridium satellite system is the first generation communication constellation system proposed by the United States in 1987. Each satellite has a mass of about 670 kilograms and a power of 1200 watts. Three-axis stable structure is adopted, and each satellite has 3480 channels, with a service life of 5 to 8 years. The biggest feature of iridium satellite system is to realize global communication through relay between satellites, which is equivalent to moving the ground cellular mobile phone system to the sky. Compared with the geostationary satellite communication system, it has two advantages: first, the orbit is low, the transmission speed is fast, the information loss is small, and the communication quality is greatly improved; Second, the iridium satellite system does not need a special ground receiving station, and every mobile phone can contact the satellite. (Content from Encyclopedia)

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