The small-scale unmanned helicopter is well-known by its hovering capabilities. However,it exhibits a nonlinear and complex dynamic phenomenon,and it is a loop unstable,high degree of inter axis coupling system. The goal of autonomous flight was realized based on an accurate and appropriate helicopter model. And system identification is the practical method to obtain the model. Aiming at the system identification of a small-scale unmanned helicopter in hover condition,a novel algorithm combined prediction e...