Accession Number : ADD002250

Title :   Tracking System for Underwater Objects.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Spindel,Robert C ; Porter,Robert P

Report Date : 23 Dec 1975

Pagination or Media Count : 5

Abstract : The patent relates to a system for tracking with high precision the movement of an underwater object having a sound detecting capability which employs three bottom-moored acoustic signal sources which are generally disposed in a triangular pattern and continuously radiate acoustic signals which are clustered, for example, about 12 kc. The composite signal that is detected is processed so that each radiated signal is subsequently transformed into a pair of quadraturely phased signals which are proportional to the sine and cosine of the input phase angle. These signals are converted to digital form and, thereafter, supplied to a digital computer which determines the inverse tangent of the ratio of these pair of signals. The phase of each signal so determined may be used, for example, to ascertain the slant range changes of the object with respect to a three-dimensional coordinate system.

Descriptors :   *Underwater objects, *Underwater tracking, *Patents, Doppler navigation, Underwater navigation, Acoustic detection, Slant range

Subject Categories : Acoustic Detection and Detectors
      Underwater and Marine Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE