То the theory of two-dimensional automatic control systems with modulation

The linearized two-dimensional automatic control systems with identical channels and antisymmetrical cross connection are considered. There obtained, in complex coordinates, an equation of a closed-loop two-dimensional system with signal modulation with taking into account the non-stationarity introduced by a demodulator. The equation in reduced to a stationary form. The conditions are revised whose realization require that the demodulator non-stationarity should be obligatory. The system's static error coefficient constraints connected with the demodulator non-stationarity are shown.