Performance Criteria Assessment of Marine Radionavigation Systems Reliability Under Degradation Factors

ABSTRACT The article examines the assessment of the reliability of shipboard radio navigation systems under the influence of degradation factors, with a focus on the impact of both gradual and sudden failures on the continuity of navigation equipment. A classification of failures is presented, environmental and operational factors affecting the efficiency of systems are identified, and the risk of failure is quantified using mathematical modelling. A combined approach to reliability assessment is proposed, which takes into account the probability of failures due to ageing (gradual failures) and external influences (sudden failures), based on an exponential distribution model. An analysis of the mean time between failures (MTBF) of key radio navigation systems was carried out, the probability of failure of at least one element during an operational period of up to 350 days was estimated, and a conceptual model for optimising maintenance was formed. Methodologically, the study is based on the development of a two‐factor model that combines the assessment of gradual and sudden failures of shipboard radio navigation systems. To quantify the intensity of failures, an exponential distribution law is used with the integration of correction factors that take into account the influence of the environment and the human factor. The MTBF is calculated taking into account both types of failures, which ensures the complexity of the assessment. The results are supported by tables, graphs and theoretical generalisations that form a reliable basis for improving the fault tolerance of modern marine navigation systems.