Impact Analysis of Radio Frequency Interference on Maritime DGNSS

Abstract

The current maritime DGNSS RSIM consists of reference station (RS), for generation and broadcast of the differential corrections with a minimum-shift keying (MSK) modulator and a transmitter, integrity monitor (IM) for checking the quality of corrections received from the RS, and a control station (CS), for operation and control of the RS and the IM. Based on the known position, the RS estimates the pseudorange errors of the GNSS signal, and broadcasts the corrections to users, by using MF signals. However, if the RS is affected by intentional or unintentional radio frequency interference (RFI), it will not be able to perform the functionalities of DGNSS RSIM, as well as affect the quality of the pseudorange because the reference antenna cannot receive the GNSS signals correctly. Therefore it is necessary to alert the RFI effect to operators immediately. This paper presents an analysis of the RFI effect on the reference receiver and DGNSS RSIM system when RFI occurs in the current maritime DGNSS. First of all, it describes the configuration of DGNSS and RTCM RSIM messages, and then classifies the specific parameters of RSIM messages, which are affected by RFI, and finally, it summarizes the output results by the RFI characteristic. These results will be able to offer advantage, as significant data for setting the threshold for RFI detection and identification at the DGNSS RSIM system.ity of corrections received from the RS, and a control station (CS), for operation and control of the RS and the IM. Based on the known position, the RS estimates the pseudorange errors of the GNSS signal, and broadcasts the corrections to users, by using MF signals. However, if the RS is affected by intentional or unintentional radio frequency interference (RFI), it will not be able to perform the functionalities of DGNSS RSIM, as well as affect the quality of the pseudorange because the reference antenna cannot receive the GNSS signals correctly. Therefore it is necessary to alert the RFI effect to operators immediately. This paper presents an analysis of the RFI effect on the reference receiver and DGNSS RSIM system when RFI occurs in the current maritime DGNSS. First of all, it describes the configuration of DGNSS and RTCM RSIM messages, and then classifies the specific parameters of RSIM messages, which are affected by RFI, and finally, it summarizes the output results by the RFI characteristic. These results will be able to offer advantage, as significant data for setting the threshold for RFI detection and identification at the DGNSS RSIM system.