An improved vector fitting method for parameter identification of transfer functions

The electromagnetic field antenna's amplitude-frequency characteristic is not smooth, must establish its equivalent transfer function to carry on the digitization to the metrical data to adjust, can the correct scale adjustment leave the actual electromagnetic interference intensity. Therefore, in the traditional plural number vector fitting's method foundation, through increases the derivative information as well as the coefficient matrix right while one opposite angle, proposed one kind of improvement plural number vector fitting law. Because the derivative may reflect the data the partial rate of change, therefore joins the derivative element the coefficient matrix, theoretically may contain more by the fitted curve higher order information and the partial detail; But is right to further reduce the coefficient matrix while one opposite angle the equation condition number, thus enhancement computational accuracy. The simulation and the application result indicated that the improvement algorithm compared with the traditional plural number vector fitting law, may approach the actual amplitude frequency characteristic well the partial detail, has the higher fitting accuracy, and reduces to a certain extent to the frequency range sampling points request.