Perspective radar display system: TV-like presentation on CRT provides higher lateral position and lateral motion sensitivity than a PPI

The data rate and display format of a conventional navigation radar/PPI display are adequate for most purposes but have limitations in certain close-range applications such as precision maneuvers in low-visibility conditions. At close ranges the PPI format bunches the close targets near the center of the scope where the inherent azimuth resolution is poorest. Close targets may make several degrees of change in relative bearing before the change is noticeable on the PPI display. Also, a small change in heading of "own ship" is not immediately apparent on a PPI display. Radar Systems Company has developed a Perspective Radar Display System which provides a perspective presentation on a cathode ray tube of the volume of space being scanned by an electromechanical scanning (nonrotating) radar antenna. This type of display has higher lateral position and lateral motion sensitivity than a PPI display. It has the additional capability of varying the apparent altitude of perspective. This report covers a technical and operational evaluation of the Perspective Radar Display System to determine its effectiveness as an aid to piloting; for precision maneuvers in low-visibility conditions; for collision avoidance, intercept solution, and shadowing; and for aiding SEAL team cast and recovery operations.