Union Estimation Algorithm for DOA of CM Signal and Gain and Phase Errors of Array Antennas

A union estimation algorithm for direction of arrival (DOA) of constant module (CM) signal and gain-phase values of array antennas is presented. At first, the improved ILSP (iterative least squares projective) algorithm is presented to estimation the DOA of signals. Then a cost function based on nonlinear constraint is given to solute the gain and phase errors. By repeating iterative procedures above mentioned, new algorithm can give the DOAs estimation of CM signals and gain and phase coefficients of array antennas. The new algorithm does not need the assistant calibration sources that directions are known and may estimate direction of actual source online. Simulations show the validity of the new algorithm.