Abstract:

A new mutual coupling calibration algorithm is presented to estimate the mutual coupling coefficients of uniform circular array. Firstly, the signal subspace vector including information of mutual coupling coefficients is expressed as product of mutual coupling coefficient matrix and perfect array steering vector. In accordance with transform formula between mutual coupling coefficient matrix and perfect array steering vector, the independent elements in mutual coupling coefficient matrix can be expressed as a column vector. Based on least condition number rule, the column vector is given by the matrix inversion. Simulations demonstrate accuracy for estimation of the mutual coupling coefficient matrix and the stability for error perturbation of the algorithm.

Key words: uniform circular array, mutual coupling, condition number, calibration algorithm