### ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

## 2aUW4. An approach to matched field processing in correlated multipath
environments.

**Robert Zeskind
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*The MITRE Corp., 7525 Colshire Dr., McLean, VA 22102-3481
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**Mark Owen
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*PRESEARCH, Inc., Fairfax, VA 22031
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Matched field processing (MFP) is based on some type of comparison of
actual received signal across the elements of an array to predicted array
element response based on complicated propagation models for postulated source
locations. It is well known that these techniques are very sensitive to model
mismatch. Investigators have proposed modified MFP techniques of varying
complexity to be more robust to mismatch. A simplified approach to MFP in a
correlated multipath environment is to estimate the parameters of the path
arrivals at the array based on an assumed wavefront model for each path. The
parameters to be estimated are arrival angles, relative received level for each
path, and the correlation coefficient between pair of paths. For spherical
wavefronts, the distance traveled along each path is also estimated. It is
assumed that there are only a few dominant paths and their number is known. The
parameter estimation problem is posed as a well-known optimization problem. The
solution to the optimization problem not only acts as a detector, but provides
the set of estimated parameters to be used in a raytrace propagation model to
back propagate the multipath to localize the detected target. An example is
presented to illustrate the method.