Measurements

Get MIT RadLab {complete set} Vol 20 - Electronic Time PDF

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By B. Chance, et al.,

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Sample text

Automatic frequency demodulation is carried out by variation of df/dt in two ways: first by variation of the repetition rate of the timing wave, and second by variation of the extent of frequency modulation at a constant repetition rate. The use of this technique in distance and speed measurements is given in greater detail in Sec. 12. Target selection and discrimination in frequency-modulation systems must depend upon frequency selection. 3 The distance of any target corresponds to a particular value of frequency, and the total frequency shift corresponding to the maximum value of At must be sufficient to permit frequency selection with reasonable circuits, that is, bandwidths of approximately 10 cps or greater.

21, Sec. 3). A specialized navigational computer, which has been developed for the solution of these problems, presents a direct indication of course to and time of arrival at a destination (see Sec. 28 and Vol. 21, Chap. 7). Associated equipment may often greatly decrease the accuracy requirements of prediction. For example, airborne radar simplifies the problem of Ground Control of Interception, GCI. Similarly, proximity fuses and guided missiles decrease the accuracy required of antiaircraft fire control and bombing systems.

For example, if the transmissions of Station 2 are synchronized with those of Station 1, the time difference in reception at A gives the difference of distances to the two stations. A constant difference of dl and dt defines a hyperbolic line of position The intersection of this line of having Stations 1 and 2 as its foci. position with another similarly derived from Stations 1 and 3 gives the Although this system has geometry that yields somewhat position of A. less accuracy than a system employing circular lines of position, it is of extreme importance because it permits the position of A to be found by receiving equipment alone.

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MIT RadLab {complete set} Vol 20 - Electronic Time Measurements by B. Chance, et al.,


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