This study aimed to use the combined advantages of Space–Air–Ground Integrated Network (SAGIN) and BeiDou short-message technology to realize information interaction between various units within the system perception layer, considering the difficulties of poor communication in remote areas, limited coverage of existing ground networks, and the inability to send monitoring information of high-voltage transmission lines in a timely manner. The sensing terminal was used for terminal analysis and calculation, and the key exception and alarm information were edited into short messages to compensate for the disadvantages of BeiDou short-message communication technology. External communication used the BeiDou short-message communication technology. This method could effectively solve the transmission problem of key data of online monitoring systems in remote areas.
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