Study on strapdown decoupling technology for rolling missile using RF interferometer seeker

Because strapdown seeker is fixed on the missile body, the guidance signal for proportion navigation law can not be directly got. And the outputs of strapdown seeker are not appropriate to be directly used in the control system of the missile, for it couples with the missile body angular motion, Aim at a strapdown seeker using RF interferometer for guidance, this article presents a decoupling method that a dynamic gyro is used to decouple from the body angular motion of the missile, The dynamic gyro is used for tracking line of sight, and at the same time line of sight rate and gimbal angle outputs are available for autopilot command application. The guidance signal for proportion navigation law is derivation from outer gimbal´s precessing current of the dynamic gyro. First, the angle-measure principle of phase interferometer is analyzed in the paper; second, the decoupling principle from body angular motion is advanced in the paper. It is proved that the guidance signal, namely line of sight rate in inertial space can follow the input signals well, and the effect of body angular motion can be effectively isolated.