CHAPTER 20
CHAPTER 20HEIGHT FINDING AND 3DRADARDavid J. MurrowGeneral Electric HEIGHTFINDINGRADARSANDTECHNIQUESEarly radar Techniques for Height Finding. Early radar techniques em-ployed to find target height were classified according to whether or not theearth's surface was used in the measurement. The practice of using the earth'ssurface for height finding was quite common in early radar because antennaand transmitter technologies were limited to lower radio frequencies and broadelevation beams. The first United States operational shipborne radar , laterdesignated CXAM and developed in 1939 by the Naval ResearchLaboratory (NRL), used the range of first detection of a target to estimate itsheight, based on a knowledge of the shape of the pattern near the horizon dueto the primary multipath null. Later a refinement was made as the targettraversed the higher- elevation multipath nulls or "fades.
MG. 20.1 (Loniinued) tiarly radar height finding techniques, (e) Electromechan-ical beam scanning. (/) 2D antenna with vertical line array. Of course, it is possible to rapidly scan a horizontal fan beam in elevation …
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