What is SMS communication?

Short message communication uses Morse signal code for wireless telegraph communication. Morse signal means that letters and numbers are represented by a set of codes with different lengths, long signals are represented by dotted lines, and short messages are represented by dots. Then launch it through a launch button. When the signal is long, the button takes a long time to open, and when the signal is short, the button takes a short time to open. The receiving direction converts the received signal into a sound signal, records the combination of long and short signals through hearing, and then translates it into a message. Simply put, "short message" is equivalent to "short message" commonly used by people. A short message can post 140 words of information, locate and display the publisher's position.

SMS communication process:

1. The sender of the short message first encrypts the communication application signal containing the ID number of the receiver and the communication content, and then forwards it to the radio station via satellite;

2. After receiving the communication application signal, the ground central station will decrypt and re-encrypt it and then add it to the external broadcast message to continue broadcasting, and broadcast it to users via satellite;

3. Receiving the outbound signal received by the user machine, demodulating and decrypting the outbound message, and completing the communication. Similar to the location function, the transmission delay of SMS communication is about 0.5 seconds, and the communication frequency is at most once a second.