Decoupling autopilot considering second-order steering engine dynamics and decoupling control method thereof

The invention discloses a decoupling autopilot considering second-order steering engine dynamics and a control method; and the system comprises a needed overload receiving module which is used for receiving needed overload information transmitted by a guidance system in real time, an aircraft parameter measurement module which is used for obtaining the flight parameters of an aircraft in real time, and a decoupling control module used for obtaining a rudder instruction which is completely decoupled and takes second-order steering engine dynamics lag into consideration; and a rudder instructionfor controlling decoupling is obtained according to overload information required to be used and flight parameters of the aircraft. And a rudder instruction considering steering engine dynamic lag and controlling decoupling is obtained in combination with the flight parameters of the aircraft, a rudder instruction completely decoupled and considering second-order steering engine dynamic lag is obtained in combination wit