THE LOCALIZATION ACCURACY OF A HORIZONTAL ARRAY OBSERVING A NARROW-BAND TARGET WITH PARTIAL COHERENCE

The Cramer-Rao lower bound is used to assess the potential localizatio n accuracy of a horizontal array observing a narrowband moving target. The narrowband signal received by the array is assumed to have only p artial temporal coherence, which is modeled by taking the signal to be completely coherent over a data block but with an unknown absolute ph ase from block to block. A numerical example for a linear array illust rates the improvement in localization accuracy caused by an increase i n the signal coherence time; also studied is the effect of target/arra y geometry.