**1.** What is Beidou short message communication?
The short message communication of the Beidou system refers to the two-way information transmission between the Beidou ground terminal and the Beidou satellite and the Beidou ground monitoring station directly through satellite signals. The communication uses short messages (similar to mobile phone short messages) as the basic unit of transmission. A feature attached to the Beidou satellite navigation system.
2. Beidou short message classification
Beidou short message is divided into regional short message (RSMC) and global short message (GSMC).
1) Regional short message (RSMC)
Beidou system uses GEO satellites to provide regional short message communication services to users in China and surrounding areas.
2) The Global Short Message (GSMC)
Beidou system uses MEO satellites to provide global short message communication services to authorized users located on the surface and 1,000 kilometers above the ground.
3. Advantages of Beidou short message communication
1) Fast response capability, short message communication delay is about 0.5s, and point-to-point communication delay is 1~5s;
2) The communication has strong anti-interference, and adopts S/L band satellite transmission at the same time. Penetrates the stratosphere and troposphere to ensure communication under extreme weather conditions;
3) Low equipment requirements, low equipment prices, and high cost performance.
4) Convenient networking, with command-type user machines as the core, it can quickly form a one-to-many communication network.
4. Beidou short message communication application field is
equipped with Beidou short message when ordinary mobile communication signals cannot be covered (the communication base station is destroyed after the earthquake disaster or the uninhabited area, ocean and other areas without mobile signal coverage) The Beidou terminal of the module can carry out emergency communication through short messages.
In addition, the Beidou short message can also be used in geological monitoring. After the monitoring points are arranged, the change data can be directly transmitted to the central system through short messages, and the sudden natural disasters can be responded to in time after calculation.
In addition, the terminal equipment with Beidou short message module can also be used in remote voice command and dispatch, sea and air contact, border patrol, individual intercom, anti-terrorism security, disaster relief, confidential communication, field operations, field exploration, etc. It can also be applied to wired and wireless confidential calls.