. The Bell System technical journal . esent the com-plete scene is reviewed in the following sections. In this section the charac-teristics of the presentation will be reviewed from the standpoint of therequirements imposed by the various radar applications. The electro-optical characteristics of the display device are also discussed. Classification of Radar Display Types The number and types of display methods which have been developed formilitary radar systems during World War II are the result of the variedspecific applications to which radar has been subjected. These types ofdisplays
. The Bell System technical journal . esent the com-plete scene is reviewed in the following sections. In this section the charac-teristics of the presentation will be reviewed from the standpoint of therequirements imposed by the various radar applications. The electro-optical characteristics of the display device are also discussed. Classification of Radar Display Types The number and types of display methods which have been developed formilitary radar systems during World War II are the result of the variedspecific applications to which radar has been subjected. These types ofdisplays are in general related directly to the functional classification ofmilitary radar systems previously discussed. It is of interest to considerat this time the various types of indicators which have become common inthe radar field. Figure 37 illustrates the basic characteristics of the mostimportant types of radar presentations. Basically the three coordinates which determine the position of the target 758 BELL SYSTEM TECHNICAL JOURNAL. AMPLITUDE THE RADAR RECEIVER 759 in space and which are determinable from a single radar observation loca-tion are the range to the target, azimuth angle with respect to a chosendirection axis, and elevation angle as measured from a convenient referenceplane. The classification of radar displays shown in Fig. 37 results from thefact that the only available and convenient display device has the propertyof resolving only two such coordinates simultaneously. The radar displayproblem is then one of selecting the most important two coordinates for thespecific radar application and choosing the presentation means example, if the radar system under consideration is to be employed on asurface naval vessel against similar naval vessel targets, it follows thatelevation angle radar information is redundant and, therefore, type-A or Bdisplay patterns are quite satisfactory and are in fact the typical presenta-tions which have been universally
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