Research on Onboard PNT Information Integrity Monitoring

Abstract

Abstract
With the Global Navigation Satellite System (GNSS) development, the GNSS applications have been widely used in the maritime field, especially for onboard equipments. As GNSS signals are susceptible to interference, the International Maritime Organization (IMO) has been investigating resilient PNT as the primary resolution for Positioning, Navigation and Timing (PNT). Resilient PNT is based on all available PNT sources and integrated positioning algorithms, not dependent on GNSS completely. It improves the PNT information integrity by the error compensation capability of the different navigation systems. This paper summarizes technology standards related to navigation systems and PNT integrity in the maritime field. On the basis of these analyses and investigations, a framework for onboard PNT integrity monitoring is proposed. It can provide a timely alarm to users when the navigation system cannot be trusted or used for regular operation. The proposed integrity monitoring framework is in line with the IMO e-Navigation strategy. It can provide resilient PNT information for the Maritime Autonomous Surface Ship (MASS) and the future intelligent development of the maritime field.