Method of dynamic data transmission for GNSS-monitoring of transport

The methods of filtration and data transmission for maritime and land-based vehicles in satellite GNSS-monitoring are studied. In the context of the organization of the satellite monitoring system for maritime transport, as well as for some land transport (freight over long distances), the use of satellite Internet becomes rather essential. Due to the high costs of traffic of the communication channel, the continuous transmission of navigation information becomes extremely expensive — filtration of data is required in order to reduce costs. At the same time, to monitor in real time, it is necessary to preserve the original information of tracks as much as possible. For this purpose, a method that takes into account the dynamic nature of the movement of vehicles is developed. The method is based on the use of dynamically changing data transfer period, which depends on the speed of the vehicle. The article provides the algorithm of the analysis of GNSS-tracks, used to calculate the optimal data transfer periods. The final graphical characteristic of the dynamic method for land (for example, cars) and sea (for example, ferries) vehicles is presented. The proposed dynamic method was tested on a set of GNSS-tracks. The software filtering track points by the method given above is designed. The application of this method is demonstrated for each considered type of vehicles. The dynamic method allows significantly reduce the amount of traffic required to transfer data to the GNSS-monitoring systems, while loss of information is unessential. Depending on the configuration, the method can be applied in the satellite monitoring systems, working with any type of vehicles.