Expected Performance Gain of a Proposed AN/SQS-26 Data Normalization Device.
Abstract
The work reported in this technical note gives partial results of an evaluation of a post-processing data-normalizing technique for the AN/SQS-26 CP channel. The purpose of the study of normalization techniques is to determine modifications to the AN/SQS-26 processors so that the output statistics will be time stationary. It has been shown in a previous technical note that the ratio of the standard deviation to the mean value at the ouptut of the CP processor is essentially constant for an input which has fixed bandwidth but is varying in level as a function of time. This means that a device which produces a constant mean at the CP processor output, to be referred to as the mean-divider, might be used as a normalizer. However, for sonar echo ranging cycles, the CP processor is preceded by an AGC which results in a fixed input level and varying bandwidth, since the first few seconds of such echo cycles are typically composed of 100 Hz bandwidth reverberation which fades gradually into 130 Hz ambient and own ships noise. Thus there is time variation in the level of the CP processor output which is due to the CP channel correlator which acts as a 100 Hz bandpass filter.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 14, 1968
- Accession Number
- ADA066692
Entities
Organizations
- Tracor