The Effect of Monitor Type and Display Orientation on the Classification of Targets on a Simulated Dynamic Passive Sonar Display.
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With current sonar technology the operator must handle large quantities of data. The primary medium for displaying these data is the CRT. Because of the limited space available on the CRT, the operator must scan multiple pages of data rapidly if he or she is to monitor all of the information. Thus, signal visibility is critical. To ensure good visibility, it is necessary to understand the impact of display characteristics on the processing of sonar information from visual displays. The current study examined the impact of two display characteristics on the classification of targets on a Frequency-Time-Intensity FTI display. The first was type of monitor - multichrome or monochrome. Many systems use a monochrome monitor because its resolution to addressability ratio is usually superior to that of a multichrome display at an equivalent addressabllity. The second was orientation of the signals relative to the orientation of the CRT raster. Currently, the signals on an FTI display are perpendicular to the CRT raster. The study examined the benefit of having target lines on an Fri display fall along the scan lines of the CRT. There were no significant differences in classification performance as a function of monitor type or display orientation. However, trends in the data supported the use of a VP display format in which targets lines fall along the scan lines of the CRT.
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