| 摘要 |
An inductive look angle sensor for a guided missile radiation seeker in which the optical system of the seeker is secured to a gimbal ring that is mounted by bearing mounts to a gimbal post that is stationary with respect to the missile airframe, and the gimbal ring is adapted for rotating back and forth relative to the airframe during a missile roll cycle when the look angle of the radiation seeker relative to the airframe is not zero degrees, is disclosed. The sensor includes a first coil wound on the gimbal post; a second coil wound on the gimbal ring for inductive coupling to the first coil; a signal generator coupled to one of the two coils for providing a first alternating signal having a predetermined frequency; and a demodulator coupled to the other coil and the signal generator. The first and second coils are located relative to each other for enabling the other one of the two coils to inductively respond to the first signal by providing a second signal. The demodulator is coupled to the signal generator and the other coil for demodulating the second signal to provide a look angle signal having an amplitude that is proportional to the look angle, a relative phase that indicates the direction of the look angle, and a frequency that is equal to the roll frequency of the missile.
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