Abstract:

In order to improve the two dimensional (2D) angle measurement precision of uniform circular array (UCA) with low computational complexity, a 2D direction of arrival (DOA) estimation algorithm is proposed and the algorithm is based on the mode space algorithm and multiple invariance estimation of signal parameters via rotation invariant technique (MI-ESPRIT). Firstly, the UCA is equalized to a virtual uniform liner array (ULA) via the modespace algorithm, and the rotational invariance of the ULA is obtained using the recursive nature of Bessel functions. Then a simple and effective subarray dividing approach is proposed and the multiple rotation invariant equation of the array is obtained. Finally, the closedform solution of the equation is obtained using multileastsquare (MLS) criterion so that the 2-D DOA estimation is completed. The simulation results verify the effectiveness of the proposed algorithm.