DocumentCode :
906794
Title :
Limitations on the overlap-correlator method imposed by noise and signal characteristics
Author :
Edelson, Geoffrey S. ; Sullivan, Edmund J.
Author_Institution :
Dept. of Electr. Eng., Rhode Island Univ., Kingston, RI, USA
Volume :
17
Issue :
1
fYear :
1992
fDate :
1/1/1992 12:00:00 AM
Firstpage :
30
Lastpage :
39
Abstract :
Limitations on the performance of the overlap-correlator method of forming a passive synthetic aperture are derived. The technique uses the overlap of the array in sequential positions to estimate a series of phase correction factors that compensate for the motion of the array over time. It is of primary interest to optimize this overlap with respect to the effects of random noise. By minimizing the variance of the estimates of the set of phase correction factors, it is found that the optimal overlap is one-half the length of the physical array. Using this optimal overlap, the bounds on the usable spatial response are then determined as a function of signal-to-noise ratio and the number of hydrophones in the physical array. The ability of the overlap-correlator algorithm to synthesize a coherent aperture is investigated for the case of multiple sources in the absence of noise
Keywords :
acoustic signal processing; correlation methods; sonar; underwater sound; acoustic signal processing; array motion compensation; coherent aperture; hydrophones; multiple sources; optimal overlap; overlap-correlator method; passive synthetic aperture; performance limitations; phase correction factors; random noise; signal-to-noise ratio; sonar; spatial response; Acoustic beams; Acoustic measurements; Antenna arrays; Phase estimation; Phase measurement; Phased arrays; Sea measurements; Sensor arrays; Signal to noise ratio; Sonar equipment;
fLanguage :
English
Journal_Title :
Oceanic Engineering, IEEE Journal of
Publisher :
ieee
ISSN :
0364-9059
Type :
jour
DOI :
10.1109/48.126952
Filename :
126952
Link To Document :
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