The non-driven structure micromachined gyroscope can not only sense the angular rate of rotating but also sense input angular rate（picth and yaw angular rate）at the same time of high-speed-rotating airframe.In order to demodulate yaw and pitch angular rate

the space benchmark is set up based on accelerometer.The deflexion orientation of the rotating airframe is ascertained according to the difference of phase between gyroscope and accelerometer output signals.The principle of this method is illustrated and the error is analyzed.Moreover

the composite math model of main effect of rotating angular rate and input on phase-difference is set up to compensate the error.The results show that the method can determine the deflexion orientation of the rotating airframe

so the yaw and pictch angular rate can be demodulated.