What is a satellite phone?

Satellite phone is a communication machine based on satellite communication system to transmit information, that is, satellite relay communication machine. Satellite repeater is the product of modern mobile communication. Its main function is to fill the areas that can't be covered by existing communication terminals (wired communication and wireless communication) and provide more perfect services for people's work.

In modern communication, satellite communication is irreplaceable by other communication methods, and all communication functions provided by existing ordinary communication have been applied in satellite communication.

After nearly two years' efforts, China Telecom released its number to the commercial market for the first time, and China entered the "mobile phone era" of satellite mobile communication, which filled the gap of domestic independent mobile communication system and broke the status quo of relying on foreign satellite mobile communication services. Tiantong satellite has a wide coverage, strong communication ability and no blind area in service.

Extended data:

System composition of satellite phone:

1, space system

Due to the small size of the mobile antenna terminal, the satellite radiation power required by each channel in the L-band is greater than that of the corresponding channel in the fixed satellite service. It is estimated that the satellite power is 3000W, the antenna diameter is about 5m, and the multi-beam covers the service area. This requires each signal to be routed from a single K-band beam to the desired L-band beam, and vice versa.

2. Satellite mobile radio and antenna

Function and complexity of satellite mobile radio and land mobile radio. The number and types of components are similar except that the satellite mobile radio station uses a channel interval of 5kHz instead of 25 or 30kHz.

3. Gateway stations and base stations

The earth station works in K-band. Because the basic structure of satellite mobile communication service is single channel per carrier, the gateway station must automatically tune to the 5kHz channel according to the instruction from the signaling channel of the network control center. The base station needs a frequency synthesizer, which can work on a fixed channel.

Baidu encyclopedia-satellite phone