. Airborne radar. Airplanes; Guided missiles. 648 DISPLAY SYSTEM DESIGN PROBLEMS the subjects were required to report the number of concentric circles that were on a large display that subtended an angle of 14° at a viewing distance of 12 ft. An experiment such as this is typical of the type of basic investigations made for tactical display systems to determine the operator's ability to report bearing and range information as a function of display and system parameters. This kind of display problem would be involved in CIC and AEW installations. The data reported were obtained at two levels of
. Airborne radar. Airplanes; Guided missiles. 648 DISPLAY SYSTEM DESIGN PROBLEMS the subjects were required to report the number of concentric circles that were on a large display that subtended an angle of 14° at a viewing distance of 12 ft. An experiment such as this is typical of the type of basic investigations made for tactical display systems to determine the operator's ability to report bearing and range information as a function of display and system parameters. This kind of display problem would be involved in CIC and AEW installations. The data reported were obtained at two levels of brightness and two viewing distances. It appears that there is an interaction between the number of circles, the size of the display, and the illumination. It is also obvious that if the number of circles could be kept below five, the effect of size and brightness can be minimized and the reaction time will be a negligible factor as a human engineering problem. An important characteristic of the human operator is his ability to receive and act upon information. This characteristic is predicated on the fact that all the characteristics of the signal are well above the threshold of the observer and he has merely to extract the information from the symbol and act upon it. In this class of behavior, the operator is acting as a digital device in that he absorbs information and acts upon it in serial fashion. There is a separate response to each signal even though the signals may be in sequence. This last statement is to differentiate this form of activity from that which exists when the operator is acting as an error detector in a tracking system. This case will be considered in a subsequent 1 23456789 10 INFORMATION PRESENTED (H,in bits/sec) Fig. 12-31 Information Transmitted as a Function of Speed of" Presentation and Mode of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - co
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