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bearing rate and change of range data, and passes them back to the observer, typically by a "follow the pointer", indicator of predicted target elevation and bearing or by remote power control of the observer's optical instruments. The observer then corrects the estimate, creating a feed back loop, by comparing the observed target motion against the computer generated motion of his optical sights. When the sights stay on the target, the estimated speed, range, and change of rate data can be considered correct.
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An alternative, non-tachometric, gonometric method of AA prediction is for specially trained observers to estimate the course and speed of the target manually and feed these estimates, along with the measured bearing and range data, into the AA fire control computer which then generates change of
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utilizing gears and levers to physically perform the calculations of protractors and slide rules, using moving graph charts and markers to provide an estimate of speed and position. Variation of target position over time was accomplished with constant-drive motors to run the mechanical simulation.
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generates target position, speed, direction, and rate of target range change, by computing these parameters directly from measured data. The target's range, height and observed bearing data are fed into a computer which uses the measured change in range, height and bearing from successive
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observations of the target to compute the true range, direction, speed and rate of climb or descent of the target. The computer then calculates the required elevation and bearing of the AA guns to hit the target based upon its predicted movement.
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The term tachymetric should more properly be spelled as "tachometric" which comes from the Greek "takhos" = speed, and "metric" = measure, hence tachometric, to measure speed.
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Weapon
Control in the Royal Navy 1935-45, Pout, p126-127, from The Application of Radar and other Electronic Systems in the Royal Navy in WW2 (Kingsley-editor)
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Weapon
Control in the Royal Navy 1935-45, Pout, p127, from The Application of Radar and other Electronic Systems in the Royal Navy in WW2 (Kingsley-editor)
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BRITISH MECHANICAL GUNNERY COMPUTERS OF WORLD WAR II, Bromley, p17
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An example of tachometric AA fire control would be the USN
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The RN Pocket
Gunnery Book, p153-154, paragraphs 432-435
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The RN Pocket
Gunnery Book, p153-154, paragraphs 432-435
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BRITISH MECHANICAL GUNNERY COMPUTERS OF WORLD WAR II
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Control in the Royal Navy 1935-45, Pout, p104
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143:Weapon Control in the Royal Navy 1935-45, Pout
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