METHOD OF CONSISTENT SURVEY OF WATER AREA WHILE SEARCHING FOR EVASIVE OBJECT Russian patent published in 2002 - IPC

FIELD: location of object with use of sonar system, secondary search for evasive object. SUBSTANCE: look-outs are uniformly located at start of search along boundary of search area exceeding boundary of possible positions of object by value of radius of response of location aids and then they move from initial points along trajectories of Archimedean spirals having centers in region of point of loss of contact in which mentioned spirals cross boundary of area of possible positions of object. Number of look-outs is chosen on condition that survey of water area is carried out without any omissions. EFFECT: improved accuracy of method.