Title :
A computationally efficient ´doubly-steered´ approximation to the Frost beamformer for use with short observation times
Author :
Swingler, D.N. ; Krolik, J.
Author_Institution :
Div. of Eng., Saint Mary´´s Univ., Halifax, NS, Canada
Abstract :
It is demonstrated that it is possible to approach the performance of a Frost (1972) beamformer but with significantly less computational effort by pre-steering in only few primary directions equi-spaced in sin( theta ) terms, and using linear constraints to perform secondary steering about the primary directions. Various issues concerning the number of taps, the dimension of the constraint space statistical stability and time-bandwidth product are discussed. Results are shown using both simulated and real towed array data.<>
Keywords :
approximation theory; signal detection; Frost beamformer; constrained space dimensions; doubly steered approximation; linear constraints; primary directions; short observation times; signal detection; statistical stability; taps; time-bandwidth product; towed array data; Bandwidth; Equations; Frequency domain analysis; Narrowband; Thumb; Writing;
Conference_Titel :
Spectrum Estimation and Modeling, 1990., Fifth ASSP Workshop on
Conference_Location :
Rochester, NY, USA
DOI :
10.1109/SPECT.1990.205554
