| 摘要 |
<p>1509333 Sonars RAYTHEON CO 27 Jan 1976 [3 Feb 1975] 03032/76 Heading G1G A sonar for a ship has a transducer system 24 in which the receiving beam sensitivity direction relative to a symmetry axis 2 may be controlled. The beam direction may be space stabilized by making the beam control responsive to the ship's gyro. As claimed, a directional receiving or radiating system having a beam direction specified by bearing # and tilt α angle relative to an axis Z of the system comprises a plurality of rings (Nos. 1-8) of transducers 38 disposed in a corresponding plurality of parallel planes spaced along and perpendicular to the axis, variable delay devices (73), Fig. 8 (not shown), in channels individual to the transducers, and control means (58), Figs. 12 and 14 (not shown), responsive to selected tilt α and bearing # angles as to control the variable delay devices as to establish the beam direction, wherein the control means includes a store of sets of delay values, each set determining relative delays for transducers for an associated tilt angle, regardless of bearing angle, and selector means responsive to the selected bearing angle to associate the set of delays selected in accordance with the selected tilt angle with those transducers which provide a beam direction with the selected bearing angle. In the preferred embodiment, sets of twelve circumferentially sequential transducers from each ring, aligned parallel to the Z axis, are used to form the beam in reception. In transmission all the transducers are utilized, only the tilt α being controlled. Synchronization of transmission reference signals and reception allows gating to examine signals received from a specified range, azimuth and elevation and also allows the use of correlation techniques for the reception of echo ranging signals. The system may be used for passive listening. The transducer array may be disposed on a truncated hemisphere, Fig. 5 (not shown). The system may be alternatively an electromagnetic radiation system.</p> |
