What is Iridium Can Iridium be used in China

Iridium is not available in China because it went bankrupt in March 2000.

The Iridium mobile communication system was commissioned by Iridium in the United States to Motorola.

A global mobile satellite communication system designed by using a satellite handset, through which the satellite can dial out and receive the first signal anywhere on the earth. In March 2000, Iridium declared bankruptcy.

Advantages:

In terms of high technology, the Iridium program is indeed a beautiful story. The Iridium system is complex and advanced in that it uses on-board processing and inter-satellite link technology, which is equivalent to a terrestrial cellular network.

inverted in the air, so that the real number of the ground is now seamless communication; Another advancement is that the Iridium system solves the cross-balance between satellite networks and terrestrial cellular networks.

The Iridium satellite system consists of a space segment and a ground segment: the space segment is the constellation, and the ground segment includes the system control center, gateway station and user terminal. The Iridium system ushered in a new era of personal communication around the world and is considered a milestone in modern communication.

The system has 33 satellites in operation.

And according to the periodic table.

It coincides with the number of electrons of the element iridium.

That's why it's called Iridium.

The Iridium system is a global satellite communications system designed by the American company Motorola. Its celestial part is made up of satellites orbiting in 7 orbits, each with 11 satellites evenly spaced out to form a complete constellation. They are like the 77 electrons that orbit the iridium (IR) nucleus, hence the name Iridium satellites.

Later, calculations confirmed that 6 orbits were sufficient, so the total number of satellites was reduced to 66, but it is still customary to call them Iridium satellites.

Iridium satellites orbit at an altitude of 780 km through the north and south poles, and in addition to the 11 satellites in each orbit, there are 1 or 2 additional spare satellites. These satellites can cover the whole world, and users can communicate directly with the satellites with handheld phones, without the need for parabolic antennas several meters in diameter to make calls on a global scale.

The "Delta-2" rocket of the United States, the "Proton K" rocket of Russia, and the "Long March-2C" rocket of China respectively undertook the launch mission of Iridium. In May 1998, the mission was completed, and on November 1, the global communication service was officially opened.

The "Iridium" system is the first generation of satellite communication systems proposed by the United States in 1987. Each Iridium star has a mass of about 670 kg, a power of 1200 watts, a three-axis stable structure, 3480 channels for each satellite, and a service life of 5 8 years. The biggest feature of the "Iridium" system is to achieve global communication through the relay between satellites, which is equivalent to moving the ground cellular mobile ** system to the sky.

Once the Iridium system is built, it will allow any corner of the earth's surface to be covered without interruption, whether at sea, on land or in the air, and users can always pull out their Big Brother from their pockets to make calls. Compared with the geostationary orbit satellite communication system currently used, it has two major 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" system does not need a special ground receiving station, and each mobile device can directly communicate with the satellite, which makes the barren land on the earth inaccessible, remote areas with backward communications, and the scene of natural disasters become unimpeded.

Thus, the "Iridium" system began a new era of personal satellite communications.

How much of a technical flaw in the Iridium system played a role in the company's bankruptcy process, and is it the root cause? The answer is no. Isn't the honeycomb, which is also technically flawed, becoming more and more popular?

On the other hand, even if Iridium has no technical defects, if it is not favored by users and the market, it is still in a catastrophe. High-tech products should follow the law of technological development. Technological advancement can only be a necessary condition for the marketization of products.

Poor preparation. The Iridium system was officially launched to the market without adequate preparation, and the corresponding services could not keep up, causing adverse effects among consumers and curbing many potential consumer demand.

The Iridium system was rushed into operation under the pressure of the schedule, and the first problem exposed was that supply outstripped demand. There are two companies that produce Iridium**: one is Motorola in the United States and the other is Kyocera in Japan, but the latter has a high call failure rate due to technical problems, so it has not been put into commercial production in time.

Motorola's ** also has problems such as insufficient production and poor sales channels. Motorola's Schaumburg facility produces 1,000 Iridium** units per day, which are typically shipped to 12 Iridium gateways around the world and then handed over to partners and business providers in various countries, taking time to reach customers. According to reports, a UK user ordered an Iridium** at the beginning of the Iridium system's operation, but waited a full half a year for it to arrive.

Slow deliveries have cost Iridium a lot of users.

Secondly, due to the fact that the answer is not ready to seep into the beam, the call drop rate of Iridium** remains high, which discourages many consumers. In November 1998, at the beginning of the Iridium system service, the call drop rate reached 15, mainly because of poor software and frequent transfers from one satellite to another"Disconnection", which was later improved to reduce the call drop rate to 8, but it was still high.

However, it has been argued that poor preparation and poor timing of the market are not the main reasons for Iridium's failure.

Compared with the geostationary orbit satellite communication systems used, Iridium has two main advantages:

First, the track is low, the transmission speed is fast, the information loss is small, and the communication quality is greatly improved;

Second, there is no need for a special ground receiving station, and each satellite mobile handheld can be connected with the satellite, which makes the communication on the earth's inaccessible barren land, remote areas with backward communications, and natural disaster sites become unimpeded.

Thus, the Iridium mobile communication system program began a new era of personal satellite communications. The Iridium mobile communications system began its test launch in 1996 and is scheduled to be operational in 1998 with an estimated total investment of $2.3 billion. The main services provided by Iridium Mobile Communication System to users are:

Mobile** (mobile), paging, and data transfer. From a technical point of view, the Iridium mobile communication system has broken through key technical problems such as inter-satellite links, the basic structure and procedures of the system have been preliminarily completed, and important progress has been made in all aspects of system research and development.

In terms of high technology, the Iridium program is indeed a beautiful story. The complexity and sophistication of the Iridium system lies in the use of on-board processing and inter-satellite link technology, which is equivalent to inverting the ground cellular network in the air, so that the ground can achieve seamless communication. Another advancement is that the Iridium system solves cross-protocol roaming between satellite networks and terrestrial cellular networks. The Iridium system consists of a space segment and a terrestrial segment:

The space segment is the constellation, and the ground segment includes the system control center, the gateway station and the user terminal. The Iridium system ushered in a new era of global personal communication and is considered a milestone in modern communication, allowing humans to communicate with each other anywhere they can see on Earth. Its biggest feature is that the communication terminal is handheld, and the globalization of personal communication has realized 5 "any" (5W), that is, anyone (whoever) communicates with anyone (whomever) in any way (whatever) in any place (wherever) and at any time (whenever).

Iridium System Introduction: Born in 1998, the Iridium system is a global mobile satellite communication system composed of 66 low-orbit satellites. 66 low-orbit satellites are distributed in 6 polar orbits, and another 6 backup satellites.

The Iridium system was originally designed with 77 satellites in orbit. Its structure is exactly the same as that of the metallic element iridium, hence the name Iridium system. Although the number of satellites in the Iridium system was later reduced to 66 in the design, the name of the original Iridium system was retained.

The satellite adopts advanced data processing and exchange technology, and realizes data processing and exchange between satellites through interstellar links, and multi-beam antennas. The most striking features of the Iridium system are interstellar links and polar orbits. The interstellar link theoretically ensures that the entire process of satellite communication connection can be realized by a gateway station.

The polar orbit allows the Iridium system to provide unimpeded communication services at the North and South poles. The Iridium system is the only satellite communication system that can make calls at the poles. The biggest advantage of the iridium system is its good coverage performance, which can achieve global coverage.

Deliver mobile** services with password security to users anywhere on the planet. The low latency of the LEO satellite system provides good communication quality to the Iridium system. The Iridium system provides **, fax, data, and paging services.

Its user terminals include dual-mode mobile phones, single-mode mobile phones, fixed stations, on-board equipment and pagers.