The influence of man-made interference on the differential correction signal generated by the reference stations (RS) based on the existing radio beacons in the frequency band 283.5-325.0 kHz at designing a control and management system (CMS) of the river local differential subsystem (RLDSS) GLONASS/GPS on inland waterways is considered in the paper. Since among the man-made interference the noises from corona discharges of high voltage power lines will have dominant effect on the differential correction signal, then when power lines pass near the boundaries of RS operation zones, the significant local discontinuities of the differential field may occur. In turn, the breach of the differential correction field integrity will lead to a decrease in the navigation safety on inland waterways at using the instrumental methods of pilotage. To calculate the noise immunity of the RS-vessel radio channel under the influence of man-made interference, a method based on calculating the error probability of piece-by-piece reception of a digital differential correction signal is used. The aim of the paper is to determine the assessment of the man-made interference impact on the differential field integrity by applying an algorithm for calculating the error probability. The algorithm includes the definition of signal energy in the radio channel with fluctuation and man-made noise in the absence of mutual interference. Exceeding the permissible magnitude of the error probability will signify the breach of the differential field integrity by the man-made interference impact and the appearance of local discontinuities of the field, where it is required to install additional remote control points. Thus, the use of this calculation algorithm minimizes the number of the remote control points, which is required when deploying the control and management system.
The integrity of the navigation system is one of the important factors affecting the safety of navigation. Currently, on the inland waterways of Russia, alerts on the integrity of the GLONASS global navigation satellite system (GNSS) are transmitted through river local differential subsystems (LDSS), which include one or more reference stations. Industrial interference from industrial zones and power lines, mutual interference from neighboring reference stations and, especially, the inhomogeneity of the underlying surface affect the range of the reference stations, which leads to the integrity breach of the differential field and transmission of unreliable corrective information to the navigator. However, the navigator is not notified of the incorrect operation of the reference stations. As a result, inaccurate corrective information leads to errors in calculating the vessel position, which reduces the level of navigation safety. A method for the automatic transmission of notifications about the LDSS integrity breach from a remote control and management station (RCMS) to the ship is presented in the paper. The structure of the message transmitting the notification signal has been formed. Criteria characterizing the quality of the differential correction signal are presented. Possible combinations of such criteria, which determine the performance of the differential mode of the reference station, are identified. Each combination of criteria is juxtaposed the corresponding notification texts displayed on the monitors of the LDSS operators and on the navigator’s display. A scheme for the automatic transmission of an alarm message from a remote control point through the RCMS, the regional command and control center, the vessel traffic control center and base stations of the automatic identification system (AIS) to ship transponders has been developed. As a result, the developed method for transmitting the alarm message containing combinations of quality criteria for the differential correction signal allows to automatically inform the navigator about the reliability of the corrective information transmitted by one or another reference station.
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