Patent
Reference signal generating apparatus
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TLDR
In this paper, an optical transducer and electronic circuitry coupled with optical transducers were used to produce the reference signals from a signal generated by the transducers in response to rotation of the ring with the nutator.Abstract:
Apparatus for generating elevation and azimuth reference signals for use in demodulating a tracking error signal to provide elevation and azimuth error components for use in adjusting the position of a tracking conical scan radar antenna, includes a template ring having a notched periphery and being attached to a rotatable nutator of the antenna such that its peripheral notches are in a predetermined angular phase relationship with a reference position on a feed horn attached on the nutator, during rotation of the feed horn with the nutator. The apparatus further includes an optical transducer and electronic circuitry coupled thereto for producing the reference signals from a signal generated by the transducer in response to rotation of the ring with the nutator. As the ring rotates with the nutator, its notched periphery makes or breaks a photon path between light beam generating and sensing elements of the transducer. The sensing element then generates the signal which is received by the electronic circuitry. In addition to the two reference signals produced by the circuitry, a sync signal is generated and used internally within the circuitry to insure that the reference signals produced are in a proper phase relationship to the reference position on the feed horn of the nutator during rotation thereof.read more
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References
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Patent
Absolute incremental hybrid shaft position encoder
TL;DR: An incremental type shaft position encoder which provides a distinguishable signal at each of a plurality of predetermined shaft rotational positions, and further provides a unique electrical signature associated with each of predetermined ones of the signals was proposed in this paper.
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Magnetic-electronic position encoder
Castrovillo S,Smollin H +1 more
TL;DR: In this article, a radar antenna scanning in a horizontal plane is affixed to a rotating shaft with a cammed disc and gearwheel mounted on it, which actuates a switch at the same azimuth on each revolution of the shaft.
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TL;DR: In this paper, the rotational velocity of a shaft is monitored by a retriggerable multivibrator, which switches to a first binary state if in a second binary state at the time of an applied pulse.