. Airborne radar. Airplanes; Guided missiles. 14-17] SYSTEM CONSIDERATIONS 775 the problems of atmospheric attenuation (see Chapter 4) and the generation of large amounts of power become increasingly difficult. The maximum size of the antenna obviously will be limited for airborne installations. Range resolution may be improved by decreasing the pulse length. Here again there is a minimum limit, since the average power transmitted is a direct function of pulse length. Also to be considered in this connection is the altitude at which the system will operate, since the length of the pulse, as pr
. Airborne radar. Airplanes; Guided missiles. 14-17] SYSTEM CONSIDERATIONS 775 the problems of atmospheric attenuation (see Chapter 4) and the generation of large amounts of power become increasingly difficult. The maximum size of the antenna obviously will be limited for airborne installations. Range resolution may be improved by decreasing the pulse length. Here again there is a minimum limit, since the average power transmitted is a direct function of pulse length. Also to be considered in this connection is the altitude at which the system will operate, since the length of the pulse, as projected on the ground, is a function of the radar altitude as shown in Fig. 14-18. The packet dimensions for a typical beamwidth and pulse. 350 en 250 200 Q 150 o 100 < Chord Subt by Beamw snted dth^ ZP^ ^ F rejected -3db 1 1 Pu Beamwidth = sewidths 5° " ^ -3db Pulsev /vidth = : Msec 50 0 I J_ ^ ^ ^ ' . 0 5 10 15 20 25 30 35 40 45 50 55 SLANT RANGE, 1000 ft Fig. 14-19 —3-db Packet Dimensions vs. Slant Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Povejsil, Donald J. Princeton, N. J. , Van Nostrand
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