  Sparse arrays have attracted a lot of interests recently for their capability
of providing more degrees of freedom than traditional uniform linear arrays.
For a mixture of circular and noncircular signals, most of the existing
direction of arrival (DOA) estimation methods are based on various uniform
arrays. Recently, a class of DOA estimation algorithms based on sparse arrays
was developed for a mixture of circular and noncircular signals. To further
improve its performance, in this work, a modified algorithm is presented, which
can resolve the same number of signals, and simulation results are provided to
verified its performance.
