Nearfield Radiated Noise Study.

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Abstract:

The study consists of three related parts. Each part deals with some aspect of radiated noise measurement in which the measurement can be in the near field of the source or the combination of the source and its surface image. In the first part the estimation of far field pressure waveform is examined to determine the dependence of the estimator upon the nature of the source. In the second the effect of surface image interference upon the estimate of radiated noise intensity mean and variance is investigated. In the third part the dependence of the spectrum measurement upon the position in the field of the source is shown to be significant. Author

Author(s):
Murphy, Donald A.
Author Organization(s):
HUGHES AIRCRAFT CO FULLERTON CALIF
Descriptive Note:
Technical rept.,
Pagination:
0053

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
FR-72-11-6
Contract/Grant Number(s):
N00014-69-C-0034
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*SONAR SIGNALS, *UNDERWATER SOUND, SIGNAL TO NOISE RATIO, INTERFERENCE, NOISE, TARGET DISCRIMINATION, MULTIPATH TRANSMISSION, REFLECTION, SCATTERING
Field(s)/Group(s):
Acoustic Detection and Detectors, Acoustics
Keyword(s):
NEAR FIELD, RAMA(ROTATING ACOUSTIC MEASUREMENT ARC), FAR FIELD PREDICTION, Most Project 4
Report Date:
1971 Dec 30