Accession Number : ADA068780


Title :   Transmission of CW Pulses


Corporate Author : COLUMBIA UNIV DOBBS FERRY NY HUDSON LABS


Personal Author(s) : Brown, M V ; Ricard, James


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a068780.pdf


Report Date : 15 Aug 1960


Pagination or Media Count : 23


Abstract : This is the first of a series of reports relating to the propagation of CW pulse through the ocean. At the present writing three sets of experiments have already been performed. For this reason the discussion will not be strictly chronological. Results of later experiments will be utilized wherever convenient, and post references will be cited. By a CW pulse we mean a short burst of sinusoidal sound from a source operating at its resonant frequency. Short bursts are used in order to provide isolation of arrivals which have traveled by separate paths, e.g., direct, surface reflected, bottom reflected, and multiply reflected. To date the experiments have been largely pilot ones to locate interesting phenomena and to determine what parameters are suitable for characterizing the arrivals. Many theoretical and experimental reports have been written concerning these problems and the related ones of continuous wave transmission. All pulsed work referenced herein has been concerned with the propagation of high frequency (equal to or greater than 10 kc) sound waves; moreover, very little has been reported concerning the fluctuations of surface arrivals. This report is concerned with the transmission and reflection from the surface of low-frequency (126, 148, and 169 cps) sound waves. Two main configurations of source and receiver were used.


Descriptors :   *SOUND TRANSMISSION , *SOUND WAVES , *UNDERWATER SOUND SIGNALS , TEMPERATURE , ACOUSTIC VELOCITY , SONAR EQUIPMENT , PULSE TRANSMITTERS , SUPERLOW FREQUENCY , BOTTOM BOUNCE , ACOUSTIC CHANNELS , MULTIPATH TRANSMISSION , SONAR RECEIVERS , HYDROPHONES , CONTINUOUS WAVES


Subject Categories : Acoustic Detection and Detectors
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE