Passive Bearing Finder Report No. 1: Effect of Synchronized Time-Gating on the Signal-to-Noise Ratio of a Broadband Amplifier
Abstract
An investigation of the effect of synchronized time-gating on the signal-to-noise ratio of a very-low-frequency broadband amplifier was undertaken in an effort to improve the performance of the periscope-mounted thermal detector (Passive Bearing Finder). Measurements were made to determine the effect on rms signal-to-noise ratio of time-gating the output of the amplifier in synchronism with a 5-cps sine-wave input. Experimental results are compared with those given by application of theoretically derived formulae. Experiments were also performed to evaluate the effect of synchronized gating on signal-detection threshold where (1) a visual method of signal presentation and (2) the frequency-modulated tone type of signal presentation are used with the above broadband system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 1949
- Accession Number
- AD1210703
Entities
People
- J. W. Tucker
Organizations
- United States Naval Research Laboratory