User-Level Integrity Assessment and Reliability Provision for Maritime DGNSS RSIM

Abstract

The differential GPS RSIM currently consists of reference station (RS), integrity monitor (IM), and control station (CS) based on the RTCM RSIM standard. RS generates RTCM messages with the corrections of GNSS pseudorange for broadcasting to IM station and user receivers. IM receives RTCM broadcast and verifies that the information is within the tolerance IM checks following parameters: the number of satellites, maximum pseudorange correction (PRC) and range rate correction (RRC), correction age, PR/RR residuals. As the purpose of the DGNSS service is to monitor the integrity and enhance the position accuracy, the integrity and the position accuracy with respect to actual user aspect, it is dependent on the environment of user system.

In order to secure the integrity and reliability of user aspect such as ship operator and navigation system, this paper attempts to provide the reliability level of maritime navigation applying the real measurement of a port. First of all, to assess the integrity of navigational signal of developed port PNT module and DGNSS RSIM, it estimates the horizontal protection level (HPL) and horizontal position error (HPE) according to the predefined alert limit (AL). From the results of user-level quality monitoring and integrity assessment with DGNSS RSIM and developed port PNT module, it determines the reliability level for maritime navigation to provide it to user receiver. Finally, thio IM station and user receivers. IM receives RTCM broadcast and verifies that the information is within the tolerance IM checks following parameters: the number of satellites, maximum pseudorange correction (PRC) and range rate correction (RRC), correction age, PR/RR residuals. As the purpose of the DGNSS service is to monitor the integrity and enhance the position accuracy, the integrity and the position accuracy with respect to actual user aspect, it is dependent on the environment of user system.

In order to secure the integrity and reliability of user aspect such as ship operator and navigation system, this paper attempts to provide the reliability level of maritime navigation applying the real measurement of a port. First of all, to assess the integrity of navigational signal of developed port PNT module and DGNSS RSIM, it estimates the horizontal protection level (HPL) and horizontal position error (HPE) according to the predefined alert limit (AL). From the results of user-level quality monitoring and integrity assessment with DGNSS RSIM and developed port PNT module, it determines the reliability level for maritime navigation to provide it to user receiver. Finally, thi