At present,constant modulus algorithm (CMA) is widely used,but it has disadvanta- ges that the convergence speed is slow and the residual error is large.

The influence of systems error,random error and truncation error of numerical integration on residual error are anelyzed.

Though the algorithm overcomes the shortcoming of conventional CMA’s larger residual error after convergence and ‘stop-and-go’ algorithm’s fixed parameters, the convergence rate is slower.

In order to guarantee ultralow sidelobe level of solide-state active phased array antenna,there is very strict requirement on the control of channel calibration residual errors and on amplititute-phase consistency of multiple channels.

Based on the basic formation principle of classical blind equalizer,the reason for generating theoret- ical error and excess mean square error in the steady residual error is disclosed,the factors influencing steady residual error,such as the order of filters,step size factors,the statistical characteristic of input signals etc,are analysed.