Single-Snapshot Signal Subspace Methods for Active Target Location: Part I: Multiple Scattering Case

E.A. Marengo (USA)


Target location, target tracking, direction finding, direction of-arrival, time-reversal, multiple signal classification.


This two-part paper investigates two signal subspace meth ods for the localization of a number of scatterers (targets) whose dimensions are small relative to the probing wave length from active antenna array data. They are the time reversal imaging with multiple signal classification (MU SIC) approach, and a new signal subspace method that is based on high-dimensional parameter search (a high dimensional MUSIC). In this, first paper of the two-part sequence, a general theory of time-reversal imaging with MUSIC is developed that is applicable for the localiza tion of arbitrary multiply scattering point targets in the near or far field via generally non-coincident arrays formed by non-collocated transmitters and receivers. The Foldy-Lax multiple scattering model is used to show that the perfor mance of the time-reversal approach for target localization remains unchanged under Born-approximable versus non Born-approximable (exact, multiple scattering) conditions. The general theory is illustrated with a numerical example.

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