Gimbal angle rate feedback by cage coil demodulation

摘要

A circuit for applying rate feedback to the pitch and yaw canard commands of a guided projectile or missile to stabilize the airframe. The circuit demodulates and differentiates the signal from the gyro cage coil to obtain a signal representative of the airframe movement at its natural frequency. Phase detectors provide a phase reference by comparing the cage signal carrier with the output of hall effect elements in the speed sensing circuitry. The rate amplitude from the differentiator is then multiplied by the phase references to resolve the rate into pitch and yaw command components. Summation circuits then scale and subtract the rate commands from the guidance commands to provide negative rate feedback.