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Title A self-cohering technique for linear arrays using the Phase Gradient Autofocus Algorithm
Creator/Author Wahl, D.E.
Publication Date1991 Feb 01
OSTI IdentifierOSTI ID: 6253031; DE91009099
Report Number(s)SAND-90-2519
DOE Contract NumberAC04-76DP00789
Resource TypeTechnical Report
Resource RelationDOE Project
Research OrgSandia National Labs., Albuquerque, NM (USA)
Sponsoring OrgDOE;USDOE, Washington, DC (USA)
Subject440800 -- Miscellaneous Instrumentation-- (1990-) ;990200 -- Mathematics & Computers; SONAR-- ALGORITHMS;SONAR-- FOCUSING; CORRECTIONS;DATA ANALYSIS;P CODES;PHASE SHIFT;SOUND WAVES
Related SubjectCOMPUTER CODES;MATHEMATICAL LOGIC;MEASURING INSTRUMENTS;RANGE FINDERS
Description/Abstract A towed linear hydrophone array is subject to snakelike bending.^If the array were processed as if it were truly linear, poor array gain coupled with a degraded source bearing estimate would result.^The signal phase errors produced by sensor position uncertainty in passive sonar arrays are similar to those observed in Synthetic Aperture Radar (SAR) imagery.^The Phase Gradient Autofocus (PGA) Algorithm has been shown to be a robust and effective method used to extract degrading phase errors prevalent in SAR imagery.^This report shows that with slight modifications, the PGA algorithm can be applied to correct phase errors resulting from sensor position uncertainty introduced into linear-passive arrays.^The results of the technique applied to simulated linear array data is also presented.^9 refs., 8 figs.
Country of PublicationUnited States
LanguageEnglish
FormatPages: (18 p)
AvailabilityOSTI; NTIS; GPO Dep.
System Entry Date2001 May 13

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