| 摘要 |
An optical tracking system wherein a first control means tends to lock a nutation electron beam upon and within the image of a target which has been projected upon a screen and constitutes a dark body upon a light background. A second control means functions to expand the nutating scanning pattern of the electron beam until it cuts across the light background in at least two different places to generate a signal whose frequency is equal to the second harmonic of the nutating scanning pattern. Said second control means maintains the amplitude of this second harmonic within certain limits to thereby insure that the scanning pattern always remains approximately the same size as the target.
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