Velocity of Sound Study
Abstract
Present implementation of the beamformer for the BQR-7 submarine sonar provides for stave-to-stave delays only. At longer ranges, however, most of the energy may be propagated via the bottom bounce mode. This results in less than theoretically maximum performance for long ranges since the energy enters through the sidelobes of the vertical beam pattern. For targets of interest, the signal-to-noise ratio (SNR) at short ranges is high enough so that one might consider sacrificing some system gain at short ranges if the detection performance at longer ranges can be significantly improved. There are several methods which might be utilized in upgrading the performance at long ranges. One method consists of steering the beam downward to intercept the energy arriving via the bottom bounce mode through the main beam of the vertical pattern. An alternate method consists of broadening the vertical beam pattern, without vertical steering, to intercept both bottom bounce and surface duct energy with the main beam. A third choice consists of a suitable combination of vertical steering and broadening to optimize the detection performance for all ranges.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 10, 1968
- Accession Number
- ADA033266
Entities
Organizations
- General Electric