Low-Frequency Pulses Observed in the San Nicolas Basin.
Abstract
Low-frequency (20 c/s) pulses have been observed in the oceans of the world by many observers. In most cases a remarkable similarity can be found between pulses observed at the different locations. The pulses observed in the San Nicolas Basin during July 1963 and reported on in this memorandum have been previously mentioned in an NEL Report. This memorandum will report an extension of the previous investigation. This memorandum should not be construed as a report as its only function is to present for the information of others a small portion of the work which was done on the above-mentioned problem. Statement of the Problem to further investigate all phases of the 20 c/s pulses, with particular emphasis placed on determining the time difference in the arrivals of a pulse at two hydrophones, and to determine the time difference for a large number of pulses in order that statistical methods of analysis can be used. The two hydrophones were spaced approximately four miles apart at depths of 60 fm and 450 fm. A statistical study of these time differences was intended to determine: (1) Whether the two types of pulses (I and II) which occur together and which repeat in a very definite pattern originate from different sources. (2) Whether a moving source is indicated by the measurements of the time differences. Due to a lack of sufficient numbers of measurements, standard statistical tests could not be made and therefore no conclusions could be drawn.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 1965
- Accession Number
- ADA049832
Entities
People
- Mel A. Calderon
Organizations
- Navy Electronics Laboratory