Satellite phone is a communication machine based on satellite communication system to transmit information, that is, satellite relay communication machine. Principle: It consists of two parts: the space part-communication satellite and the ground part-communication ground station. In this system, the communication satellite is actually a communication relay station suspended in the air.
The advantages and disadvantages of satellite phones are as follows:
Far: refers to the long distance of satellite communication. As the saying goes, "If you stand high, you can see far", and the maximum span that synchronous communication satellites can "see" to the earth can reach18,000 kilometers. Any two points in this coverage area can communicate by satellite. Generally, there is a relay station about 50 kilometers for microwave communication, and the coverage distance of a synchronous communication satellite is equivalent to more than 300 microwave relay stations.
Multi: refers to many communication paths and large capacity. A modern communication satellite can carry several to dozens of transponders, and can provide several TV channels and thousands of telephones.