Accession Number:

ADA067110

Title:

Evaluation of Normalization of AN/SQS-26 ODT Channel.

Descriptive Note:

Technical note,

Corporate Author:

TRACOR INC AUSTIN TEX

Personal Author(s):

• Fowler,B. C.

Report Date:

1968-04-17

Pagination or Media Count:

21.0

Abstract:

This technical note describes an evaluation of two schemes for normalizing the output of the ANSQS-26 ODT channel. The two techniques under consideration are described and are referred to as a mean-divider and a norm device, respectively. For this study, the ODT processor is preceded by a perfect AGC, which results in the input to the processor having a fixed level and a bandwidth which varies with reverberation-to-noise ratio, RN. Sets of interference were generated from an interference model for specified RN. The interference spectrum varied from set to set as a function of RN. However, time variations in the interference spectrum were not considered in this study. It is shown that the rate of exceeding threshold as a function of threshold varies with RN at the output of the mean-divider. This lack of normalization indicates that, for the ODT processor, no further investigation of the device is warranted.

Descriptors:

• *SIGNAL PROCESSING
• *SONAR SOUND ANALYZERS
• *SONAR PULSES
• THRESHOLD EFFECTS
• SIGNAL TO NOISE RATIO
• GAUSSIAN NOISE
• POWER SPECTRA
• GAIN
• INTERFERENCE
• SHIPBOARD
• NORMALIZING(STATISTICS)
• BANDWIDTH
• REVERBERATION
• AUTOMATIC GAIN CONTROL
• SUPERLOW FREQUENCY

Subject Categories:

• Cybernetics
• Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE