Accession Number : AD0022747


Title :   PROGRESS REPT. 1 JULY-30 SEPTEMBER 1953 (HARBOR PROTECTION PROJECT) ON CONTRACT NO. NONR-609(02) (YALE UNIV)


Corporate Author : YALE UNIV NEW HAVEN CT LAB OF MARINE PHYSICS


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/022747.pdf


Report Date : Sep 1953


Pagination or Media Count : 31


Abstract : Mine-spotting tests with the temporary X-band radar showed that mine splashes are easily detected and that low-flying planes and falling mines are trackable in some cases. Sound-ranging tests showed that the low-frequency component of long duration, which always follows a mine splash, is also observed when the mine is dropped from rest while wholly submerged. Progress is reported on the medium-range and short-range location of planted mines. Tests of Raydist equipment indicated that much lighter gear (perhaps a set designed for helicopters) would be more suitable for small boat work. Laboratory tests on inducing vortex flow (by towing suitably shaped baffles) indicated the feasibility of this method as a means of pressure mine sweeping. The special television chain for the underwater identification of mines operated satisfactorily. (See also AD-14400, Secret) UNITERMS: Harbors, Protection, Defense, Systems, Radar, Mines, Spotting, Photographic, Visual, Sonar, Countermeasures, Vessels, Navigation, Minesweepers, Pressure, Sweeping, Location.


Descriptors :   *MINESWEEPING , *HARBOR DEFENSE SYSTEMS , RADAR , LABORATORY TESTS , TELEVISION SYSTEMS , IDENTIFICATION , HELICOPTERS , NAVIGATION , BOATS , SONAR , LOW FREQUENCY , X BAND , HARBORS , COUNTERMEASURES , SPLASH , UNDERWATER MINES , MINES(ORDNANCE) , BAFFLES , MINESWEEPERS , VORTICES


Subject Categories : Undersea and Antisubmarine Warfare


Distribution Statement : APPROVED FOR PUBLIC RELEASE