S.M. Jesus firstname.lastname@example.org
and C. Soares email@example.com
SiPLAB-FCT, Universidade do Algarve, Faro, Portugal
Comments: download pdf
Ref.: Proc. MTS/IEEE Oceans'01, (ISBN 0-933957-29-7), p.776-781, Honolulu, Hawai (USA), October 2001.
Abstract : Matched-Field Processing (MFP) is now a mature
for source localization and tracking. There are at least two aspects
emerge, by their relevance, to the success of MFP: one is the ability
a given MFP processor to accurately pinpoint the source location while
sidelobes, and the other is the impact of erroneous or missing
information (known as model mismatch) in the final source location
This study addresses the first aspect regarding sidelobe rejection
considering that the processor is working on a mismatch free situation.
well known procedure to reduce sidelobes is to use a broadband MFP
(whenever a band of frequencies is available). There are a number of
ways to combine MFP information across frequency that can be classified
two broad groups: the conventional incoherent methods, that are based
the direct averaging of the auto-frequency inner products and the, say,
conventional methods, that perform a weighted average of the
inner products where the weights are the frequency compensation
The later are generally termed as coherent broadband methods since they
complex inner products.
The coherent broadband methods proposed in the literature are either suboptimal or very computationally intensive, even for a small number of frequencies. An alternative method is presented that combines cross-frequency information with the same localization performance than the standard coherent methods and a computation load similar to that of the incoherent processor. The performance of the various broadband processors is compared in simulated data.
ACKNOWLEDGMENT: this work was partially supported by FCT under project ATOMS, contract PDCTM/P/MAR/15296/1999 and by CNR (Italy) under project TOMPACO.