Download MIT RadLab {complete set} Vol 20 - Electronic Time by B. Chance, et al., PDF
By B. Chance, et al.,
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Extra info for MIT RadLab {complete set} Vol 20 - Electronic Time Measurements
Sample text
For most purposes the lack of range resolution has been a great handicap to continuous-wave systems used for speed measurement. For isolated objects—for example, a bomb or projectile—accurate speed measurements are possible without the need for range resolution. In fact, continuous-wave systems would seem to be particularly useful for this purpose, and frequencies of 10,000 Me/see would be expected to give good results by direct recording of the doppler frequency. A reading accuracy of roughly one-quarter cycle at this frequency would give velocities accurate to a fraction of a per cent provided a reasonable number of cycles were recorded.
The doppler beat note between these two reflectors is 2V/X sin A/2. —Differential doppler shift due to difference of motion of portions of reflector spectrum approaching the above A and B toward the aircraft. expression as a maximum value is obtained from the doppler beats of all the reflectors illuminated by the beam. The general form of this spectrum is indicated by Fig. 15. Another possible geometry is indicated by position B in which the beam is directed at an angle @ with respect to the ground path of the aircraft, and a portion of the ground at a considerable distance from the airplane is illuminated.
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. Examples of this system are Loran and Gee.