On the resolution capacity of wideband sensor arrays: further results

The fundamental limits on the maximum number D_max of cochannel wideband emitters uniquely resolvable by a passive K-element sensor array are studied. It is shown that for uncorrelated emitters D_max is only O(K √L), where L is the measurement time-bandwidth product. These results extend the author´s recent result, that for a uniform linear array with uncorrelated cochannel wideband emitters D_max≈K L/2. Hence, D_max of a given array for cochannel wideband signals is essentially limited only by the observation interval, rather than by the number of sensors