Sonar Signal Analyzer Q-4X.
Abstract
The Sonar Signal Analyzer, Q4-X, is an experimental instrument for the direct observation and measurement of amplitude and frequency characteristics of active sonar signals. It was designed primarily as a research tool to study the usefulness of these signal characteristics for target classification, target detection, and fire control. The analysis and display circuits were designed to facilitate the practical utilization of information derived from sonar echoes and reverberation. The design of the Analyzer is centered around an Axis Crossing Interval Meter (ACIM) which permits the rapid measurement of the frequency of a narrow-band signal such as a sonar echo. The Axis Crossing Interval Meter, described in Appendix B, was developed in this Laboratory to study frequency fluctuations in sonar signals. These frequency fluctuations of the echo are directly related to the range rate of the target. The Sonar Signal Analyzer was developed subsequently to provide, in compact form, the ACIM and auxiliary equipment necessary to derive and display range rate and amplitude information.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1958
- Accession Number
- ADA033138
Entities
People
- G. Farrell Jr
Organizations
- Massachusetts Institute of Technology