Analysis of control coupling characteristic and forward decoupling technique for rolling missile

Control coupling is a special problem of rolling missiles. Firstly, the transfer function matrix equivalent in non-spinning frame is derived, which explains the principle and characteristics of control coupling. Secondly, a function relationship between control efficiency and relevant parameters, such as dimensionless spinning rate and damping ratio, is presented. And then, two decoupling methods are compared and studied. The condition of physically realization for dynamically compensation is given. It is clearly that static decoupling of setting a lead angle which is widely used in engineering is the steady state of the feedforward dynamically compensation in essence. However, frequency of periodic command would influence on static decoupling but not dynamically compensation. In addition, dynamically compensation could set two zeros to improve the dynamic performance. Finally, the conclusions above are demonstrated through the mathematical simulation.