Accession Number : AD0688458

Title :   EXACT THEORY OF TRACKING OF MOVING UNDERWATER OBJECT BY SHORT-BASE NAVIGATION SYSTEM ATTACHED TO IMPERFECTLY STABILIZED MOVING SHIP,

Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON D C INST OF OCEAN ENGINEERING

Personal Author(s) : Vaishnav,Ramesh N. ; Magrab,Edward B.

Report Date : APR 1969

Pagination or Media Count : 34

Abstract : The theory of locating a deep submersible by measurement of time-delays in arrival of an acoustic pulse from the deep submersible to three hydrophones of a short-base navigational system was developed in detail. The theory incorporates all the relevant variables such as the translational and rotational positions and velocities of the tracking ship and the variation of acoustic speed with depth. No restriction was placed on the relative values of the horizontal and vertical coordinates of submersible relative to the tracking ship. A numerical example is given to demonstrate the use of the theory and to show the effects of ignoring the motion of the tracking ship and the variation of acoustic speed with oceanic depth. (Author)

Descriptors :   (*UNDERWATER VEHICLES, DETECTION), (*UNDERWATER TRACKING, *UNDERWATER SOUND EQUIPMENT), THEORY, DEEP SUBMERGENCE, UNDERWATER SOUND, MOBILE, UNDERWATER OBJECT LOCATORS

Subject Categories : Marine Engineering
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE