On the number of signals resolvable by an array

The Moore-Penrose inverse and the least-squares method are both used to determine the maximum number of signals that can be resolved by an array. Results indicate that in general n signals can be resolved using an n-element array. This is not in agreement with signal subspace methods that are limited to n-1 signals. It was also found that a good working definition for resolution in array processing is the ability to decouple or separate the signals in parameter space.