Phone: +7(495)967-18-50
Fax: +7(495)967-18-52

Join us:  facebook twitter

Call back Send SMS
to satellite phone Iridium

 

Iridium satellite systeme

Iridium satellite system

The Iridium satellite network includes three principal components which include the satellite network, the ground stations and the satellite phones and data units. Voice and data messages can be routed anywhere in the world by the Iridium network. Calls are relayed from the satellite phone or data unit on the ground to one of the Iridium satellites. It is then relayed from one satellite to another then down to an appropriate ground station. The call is then transferred to the public voice network or Internet when it reaches the recipient.

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. Iridium Communications Inc. owns and operates the constellation and sells equipment and access to its services. It was originally conceived by Bary Bertiger, Dr. Ray Leopold and Ken Peterson in late 1987 (and protected by patents by Motorola in their names in 1988) and then developed by Motorola on a fixed-price contract from July 29, 1993 to November 1, 1998 when the system became operational and commercially available.

The constellation consists of 66 active satellites in orbit, and additional spare satellites to serve in case of failure. Satellites are in low Earth orbit at a height of approximately 485 mi (781 km) and inclination of 86.4°. Orbital velocity of the satellites is approximately 17,000 mph (27,000 km/h). Satellites communicate with neighboring satellites via K band inter-satellite links. Each satellite can have four inter-satellite links: two to neighbors fore and aft in the same orbital plane, and two to satellites in neighboring planes to either side. The satellites orbit from pole to pole with an orbit of roughly 100 minutes. This design means that there is excellent satellite visibility and service coverage at the North and South poles, where there are few customers. The over-the-pole orbital design produces «seams» where satellites in counter-rotating planes next to one another are traveling in opposite directions. Cross-seam inter-satellite link hand-offs would have to happen very rapidly and cope with large Doppler shifts; therefore, Iridium supports inter-satellite links only between satellites orbiting in the same direction. The constellation of 66 active satellites has 6 orbital planes spaced 30 degrees apart, with 11 satellites in each plane (not counting spares). The original concept was to have 77 satellites, which is where the name Iridium came from, being the element with the atomic number 77 and the satellites evoking the Bohr model image of electrons orbiting around the Earth as its nucleus. This reduced set of 6 planes is sufficient to cover the entire Earth's surface at every moment.

Because of the shape of the Iridium satellites' reflective antennas, the satellites focus sunlight on a small area of the Earth's surface in an incidental manner. This results in an effect called Iridium flares, where the satellite momentarily appears as one of the brightest objects in the night sky and can even be seen during daylight.

 

 

Ground Infrastructure

Iridium’s global satellite constellation is supported by an extensive ground infrastructure that ensures the high reliability of the communications network through multiple layers of redundancy and back-up systems for all critical functions.

Interconnected by advanced fiber-optic and broadband satellite links, the Iridium ground infrastructure provides:

  • Terrestrial connections for mobile satellite voice and data calls
  • Network command, control and monitoring, and
  • Technical support

 

The Satellite Network Operating Center (SNOC) is the nerve center of the Iridium space and ground network — providing 24/7 monitoring and control over all network elements, including satellites, ground sites, and interconnections. The SNOC team also:

  • Conducts trending and performance analyses to ensure Quality of Service (QoS) requirements are met
  • Produces daily and weekly mission planning and orbit determination reports, and
  • Delivers real time satellite and network engineering support

 

Iridium NEXT — Iridium’s second-generation global satellite constellation — is a fast approaching, game-changing reality. It will drive innovation, create opportunities, and change the way people and organizations communicate — everywhere on the planet:

  • Delivering more bandwidth and higher data speeds
  • Meeting future consumer and industry demands
  • Enabling partner solutions on a scale not yet imagined
  • Supporting powerful new devices with enhanced voice quality and truly global coverage
  • Hosting secondary mission payloads, both on Iridium NEXT and through Iridium PRIME℠

Scheduled to begin launching in 2015, Iridium NEXT will maintain the existing Iridium® constellation architecture of 66 cross-linked Low-Earth Orbit (LEO) satellites covering 100 percent of the globe. It will dramatically enhance Iridium's ability to meet the rapidly-expanding demand for truly global mobile communications on land, at sea and in the skies.

On 23d September 2012 the Federal Inspectorate service in the field of telecommunication (Roscomnadzor) has commissioned the Russian segment of the Iridium core network operated by LLC «Iridium Communications», the Operator of the Iridium mobile satellite system on the territory of the Russian Federation.