The Design and Testing of an Experimental Frequency-Scanning Sonar Receiver
Abstract
Three experimental models of a frequency-scanning sonar receiver were built and tested between 1950 and 1955. The first model of the receiver used simple crystal filters and a radial beam scanning tube (National Union Type RBE30A) for scanning the filter outputs. The second model used feedback type LC filters and mercury-wetted switches (Western Electric Type 218-A) for scanning, and the third model used conventional passive LC filters and a 30-contact motor-driven rotary switch (ASCOP ModelH-00003) for scanning. In field tests comparing target detection using the visual display of the frequency-scanning sonar receiver with detection using conventional earphones and aural detection technique, operators using the frequency-scanning receiver consistently obtained detection at longer ranges than did operators listening with earphones. This difference is attributed in part to the narrow-band filters of the frequency-scanning receiver and in part to the "memory" characteristics of the long-persistence (P7)cathode-ray tube used in the display.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 24, 1961
- Accession Number
- AD1226421
Entities
People
- H. W. Cooper
- J V Ellison
Organizations
- United States Naval Research Laboratory