Title :
The localization accuracy of a horizontal array observing a narrowband target with partial coherence
Author :
Maranda, Brian H. ; Fawcett, John A.
Author_Institution :
Defence Res. Establ. Pacific, FMO Victoria, BC, Canada
fDate :
10/1/1993 12:00:00 AM
Abstract :
The Cramer-Rao lower bound is used to assess the potential localization accuracy of a horizontal array observing a narrowband moving target. The narrowband signal received by the array is assumed to have only partial temporal coherence, which is modeled by taking the signal to be completely coherent over a data block but with an unknown absolute phase from block to block. A numerical example for a linear array illustrates the improvement in localization accuracy caused by an increase in the signal coherence time. The effect of target/array geometry is also studied
Keywords :
acoustic arrays; acoustic signal processing; coherence; hydrophones; matrix algebra; motion estimation; signal detection; sonar; statistical analysis; underwater sound; Cramer-Rao lower bound; horizontal array; hydrophones; linear array; localization accuracy; moving target; narrowband signal; narrowband target; partial coherence; partial temporal coherence; passive sonar; signal coherence time; target/array geometry; Coherence; Frequency estimation; Geometry; Motion analysis; Narrowband; Oceans; Phased arrays; Signal processing; Signal to noise ratio; Sonar;
Journal_Title :
Oceanic Engineering, IEEE Journal of
