A method of detecting a signal in an input channel of a receiver includes
applying each of a plurality of pre-detection bandwidths to an input
signal. The method can include deriving, in a cascaded fashion, a
plurality of pre-detection bandwidths for the input channel, and
determining a temporal and spectral extent of pulsed energy in each of
the plurality of pre-detection bandwidths. The derivation of the
pre-detection bandwidths for the input channel can be performed by
dividing the input channel into a sequence of smaller bandwidth
sub-channels, so that the number of sub-channels is determined by how
much bandwidth and pulse width range is able to be covered by a single
detector.