| Abstract [eng] |
The main goal of investigation is to create methodology and geoprocessing models for port surveillance radar efficient layout, while taking into account radar blind-spots resulting large ship vessels. Typical vessel movement scenarios as well as radar blind-spot formation zones (RBFZ) were distinguished. Later analysis involved determining of vessel movement scenarios and parameters of elements involved in visibility analysis. The work led to development and implementation of geographical information software (GIS) models. The first model allows user to determine the radar shadow zone caused by one or more large vessel obstacles. The performance of models was tested on specially created demonstration analysis area. Results of the first model were used to create RBFZ map. Later this model was used to calculate zone of highest RBFZ occurrence density. The next stage of the research was aimed to develop second GIS model. The second model is used to choose best site for the new port surveillance radar. Areas with better visibility of calculated high density RBFZ areas (as well as higher absolute height) are considered better than those with lower density. Based on the result of the second model location suitability map was created. Methods of literature analysis, statistical analysis, object classification, GIS modeling, comparison, systematic analysis and formulation of conclusions were used during preparation of this work. The master thesis consists of an introduction, three main parts, conclusions, references and summaries in Lithuanian and English. The theoretical part gives an overview of over authors work: GIS application in visibility analysis, the radio wave propagation and port surveillance radar visibility modeling. Work methodology in the theoretical part provides an overview of visibility analysis component. Later author analyzes the fundaments of visibility analysis. The next section provides an overview of commonly used GIS software and geoprocessing tools for visibility analysis. The study showed that it is possible to combine standard GIS geoprocessing tools for visibility analysis into semi-automated models for radar blind-spot formation area forecasting and planning of preventive measures. The results are important for solving the security challenges in radar monitored aquatory of port. The first model allows to predict formation of radar-blind spot areas. The second model allows to choose the optimal location for the new radar installation, taking into account the results of the first model. Such tools helping to make the best use of port resources while ensuring traffic safety are particularly relevant nowadays. |
