KEYWORDS: Data transmission, Telecommunications, Data centers, Data acquisition, Data storage, Navigation systems, Satellites, Satellite navigation systems, Design and modelling
According to the transmission capacity currently provided by the Beidou-3 system, a data transmission system based on the Beidou-3 Navigation Satellite System (BDS-3) was designed to address the problems of the original data transmission of the hydro-meteorological observation system. The data transmission protocol was defined, and the data transmission message was composed of multi-minute observation data superimposed and encrypted by DES. The active self-reporting data transmission scheme and the interactive query data transmission scheme were elaborated. Data security is ensured by both data encryption and BDS-3 satellite communication; the data transmission message consists of multi-minute observation data overlay to ensure the arrival rate of real-time observation data; and the data integrity is ensured by the interactive query method.
KEYWORDS: Wireless communications, Microcontrollers, Data communications, Data processing, Data conversion, Standards development, Receivers, Data transmission, Transceivers
At present, the wireless gateway is most be used to achieve wireless communication between Profibus-DP master and slave stations. Due to the long time delay of wireless gateways, it can only be used for low baud rate communication. As such, a communication module using wireless repeater solution is designed in this paper, to realize Profibus-DP wireless communication. This article describes in detail the communication timing requirements of Profibus-DP and the software and hardware design of the wireless communication modules, especially in accordance with the Profibus protocol and timing requirements to realize the wireless communication of Profibus-DP at a high-speed communication rate.
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