Patent ID: 6603421
Filing Date: 2003-08-05
Classification: F41F,F42B,G01S

Abstract:
Apparatus wherein a single radar mounted on a naval vessel is first used to detect targets within a predetermined spherical coordinate system defining a zone having an axis of symmetry and periodically then to provide tracking signals for each different one of a selected plurality of detected targets in such zone, such apparatus comprising:(a) a pulse radar with a plurality of antenna elements arranged as a planar array antenna, such antenna elements being actuable to form a radar beam illuminating, at any given time, a portion of the zone; (b) electro-mechanical means for continuously rotating the planar array antenna through successive scans about a first axis nominally corresponding to the axis of symmetry of the zone and to a local vertical through is the planar array antenna; (c) electronic scanning means, operable during each one of the successive scans, for actuating each one of the plurality of antenna elements in the planar array antenna alternatively to: (i) direct the radar beam, in accordance with a predetermined program, to a predetermined angle with respect to the axis of symmetry of the zone to detect targets therein; or (ii) direct the radar beam toward each different one of the selected plurality of detected targets to provide tracking signals; (d) monopulse receiver means, operable when the radar beam is directed toward each different one of the selected plurality of detected targets, for producing a signal indicative of the angle between the axis of symmetry of the zone and the line of sight to each such target; (e) means for continuously measuring the pitching and rolling of the naval vessel to provide signals indicative of the deviation of the first axis from the local vertical determined by the action of the sea on the naval vessel; and (f) means for applying such signals to the electronic scanning means to compensate for any deviation of the first axis from the local vertical.