Preface
Due to the high cost of construction, maintenance, and upgrade of base stations, there is no mobile phone signal in sparsely populated places such as outdoors and at sea. At this time, satellite communication is a necessary means of communication. In the event of a disaster, satellite communications play an important role.
At present, equipment such as Iridium satellites, maritime satellites, and European satellites are relatively expensive, and a deposit is required. The monthly rental fee starts from several hundred yuan. Therefore, Beidou short message, a high-quality and inexpensive communication method, has attracted everyone's attention.
Many readers are confused about the concepts of Beidou system, GPS system, Beidou I, Beidou II, Beidou III, Beidou short message and so on, so I summarized these quick start materials.
Quick start materials
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