Hybrid technique for direction of arrival estimation by non-uniform planar array

In this work, manifold separation technique (MST) [4], MUSIC algorithm [3], direct digital frequency synthesis (DDFS) [5], and trigonometric interpolation are combined altogether in order to obtain approximated sections of pesudospectrum function represented in a form of finite series of basis functions based on finite samples. Subsequently, this series is solved numerically to obtain the DOAs. Other techniques are investigated in order to fulfill the implementation constraints; processing time and cost, but they are not presented here for space limitations.