METHOD OF VISUALIZATION OF NAVIGATIONAL SITUATION IN SHIP HANDLING Russian patent published in 2006 - IPC G01S15/89 

FIELD: ship handling.

SUBSTANCE: proposed method includes storage of electronic radar chart of terrain, determination of radar antenna position, correlation of specific features of terrain and points of interest; electronic radar chart of terrain is formed during processing radar information and is stored in form of sequence of radar images recorded during test run of ship equipped with surveillance radar, personal computer, equipment for tie-in of surveillance radar with personal computer and equipment of satellite navigational system. Then, present radar image is compared with electronic radar chart to estimate deviation of ship from preset route and reliability of information received from satellite navigational system and surveillance radar. Position of surveillance radar antenna, coordinates of radar image centers used for forming electronic radar chart of terrain and center of present radar image are determined by tie-in of surveillance radar with personal computer and satellite navigational system, with display of ship's position, her coordinates, heading and speed at superposition of present radar image whose center is tied-in to geographic coordinates determined by satellite navigational system, registration of image with navigational electronic chart on geospatial information carrier where visualization of change of actual depth in fixed point of water basin in time is carried out, isolines of maximum tide fluctuations and surface of tide fluctuations, height of tide are plotted. Some areas of water basin where actual depth is lesser than permissible magnitude (draft plus safe depth) are determined. Structure of storage of geospatial information includes conversion of flat scanning of Earth to multilevel embedded squares each of which is indexed by code which is just longer Guilbert's curve for this square. Index thus found is used for finding objects having index with prefix equal to index of preset area.

EFFECT: enhanced efficiency.