An Efficient Phase Interferometer Direction-Finding Algorithm Based on Circular Array

Interferometer direction finding technology, which provides incidence angle information with phase differences, has become a widely used method of multiple mass-market applications. Resorting to the phase information of the circular array, a direction-finding method that provides accurate estimates of incident angles is advocated. Combining with practical engineering application, the cyclic electrical sweep mode is applied to reduce the number of channels processed simultaneously. Specifically, we construct the receiving signal model according to the antenna channel gating sequence, then choose two unparallel baselines to conduct combination of phase differences. However, the existence of phase ambiguity restricts the accuracy of direction finding and is thus attentional. The clustering procedure to contrast the degree of clustering and the energy approach to determine true arrival angles are applied to solve ambiguity. The accuracy of the advocated method is validated by experimental simulations.