Iridium / Inmarsat Antenna
The concept of the iridium system was proposed in 1987. The iridium system is aimed at the limitations of the traditional terrestrial cellular telephone network. It is proposed to use 77 low-orbit small satellites to form a personal digital satellite mobile communication system covering the world. Later, due to design modifications, the constellation structure was changed to 66 satellites orbiting around 6 polar circles.
All satellite phones need to operate in open areas away from buildings and trees. Unless you have an external antenna, all satellite phones must have a clear line of sight to the sky and cannot be used inside buildings.
The concept of the International Maritime Satellite (INMARSAT) organization was first proposed by the International Maritime Organization (IMO) in 1966, and in 1976, the "International Convention on the Organization of INMARSAT" was passed. INMARSAT is a member state organization with its headquarter in London. It has 28 founding members. As of 1995, it has 75 members states, and it is gradually increasing.
Since February 1, 1982, INMARSAT first provided the INMARSAT-A system to allow ships sailing on three oceans to enjoy satellite communication services. However, this system has been discontinued since February 1, 2008; The signal was changed to digital signal. INMARSAT added the INMARSAT-C system in 1991; and from 1993 and 1994, the INMARSAT-M and INMARSAT-B systems were added respectively; in 2007, the latest INMARSAT-F system was launched to provide All high-speed ship-to-shore or shore-to-ship communications, allowing ships to conduct videoconferencing, voice, fax and information exchange, and use encryption.
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