Fps. Chin et Cc. Ko, BROAD-BAND SOURCE TRACKING USING ADAPTIVE DIRECTIONAL FILTER WITH MAXIMALLY FLAT RESPONSES AT NULL DIRECTIONS, IEEE transactions on signal processing, 44(4), 1996, pp. 862-873
A new algorithm for the tracking of broadband sources in linear arrays
employing tapped delay line processing is presented and investigated,
Using this technique, each broadband source is individually tracked i
n a time-multiplexed manner by steering a broadband null formed from t
he use of a tapped delay line filter whose weights are constrained to
have a maximally flat frequency response at the nulling direction, To
ensure that the other nulls are not changed while a particular null is
being adjusted, a beamformer is employed to preprocess the element si
gnals before adaptive processing, Since the new algorithm updates only
one tapped delay line filter at any instant, the overall implementati
on complexity of the proposed algorithm is comparable with using the L
MS algorithm directly on a broadband array. However, unlike the latter
algorithm, the convergence behavior of the new algorithm is significa
ntly faster and is almost independent of the external noise environmen
t.