Assessment of the Man-Made Interference Impact at the Construction of Control and Management System of the River Local Differential Subsystem Glonass / GPS

Abstract

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.