A statistical measure of resolution for modern direction finding methods

The ability to resolve two closely spaced sources is a desirable quality for any direction-finding method. However, as sources become more closely spaced, any direction-finding method will eventually be unable to determine that there are in fact two sources. The point at which this breakdown occurs will differ among different algorithms. The authors discuss how resolution of direction-finding methods should be measured for two closely spaced sources. Probability densities are estimated for the predicted signal directions using three different high-resolution direction-finding methods