Delay compensation as a preliminary step to adaptive beamforming (ABF) is described. Such compensation can be used for linear or planar arrays whenever the temporal width of a signal's matched-filter output peak is significantly shorter than the propagation time across the array. Preliminary delay compensation is not normally used in passive ABF processing since the signals being processed are usually steady-state or can be regarded as such. However, when transient events much be processed, such as those associated with either impulsive echoes or with matched-filter outputs of large TW signals, then compensation prior to ABF may be required in order to obtain the full array gain for the signal of interest. Methods for achieving wide-band delay compensation are described, the parameters associated with defining the minimal compensation required are explained, and losses suffered when compensation is not used are discussed.

Date Published: 28 October 1994
PDF: 9 pages
Proc. SPIE 2296, Advanced Signal Processing: Algorithms, Architectures, and Implementations V, (28 October 1994); doi: 10.1117/12.190892

Published in SPIE Proceedings Vol. 2296:
Advanced Signal Processing: Algorithms, Architectures, and Implementations V
Franklin T. Luk, Editor(s)