Organization of radio communication with remote mobile ground objects

The article considers the issues of improving the quality of information transmission on mobile objects by using modern equipment of the digital radio system DMR (Digital Mobile Radio) technology, corresponding to modern requirements for noise immunity, communication range, security of data transmission and reception. The equipment has all the advantages of digital technologies compared to analog ones, uses one channel with a frequency band of 12.5 kHz, divided in time into two logical channels. This allows you to work through a repeater with support for dual-frequency simplex technology with duplex diversity, in this mode two simultaneous independent voice connections are possible [2]. The structural diagrams of the radio interface of the proposed standard, its main advantages, characteristics, and advantages over currently used digital and analog radio systems are described. Structural schemes for the organization of communication between several subscribers have been developed, providing the possibility of simultaneous operation of two groups of users through one or more repeaters on the same channel. In order to effectively use the available data exchange resource, modern methods of channel multiplexing and their combinations are proposed. Statistical and time multiplexing using discrete multi-tone modulation allows minimizing the effects of signal attenuation with increasing frequency. The proposed technical solutions provide the possibility of gradual replacement of obsolete equipment due to the simultaneous use of analog and digital equipment, as well as effective use of the frequency range in conditions of its limited distribution.

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