Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1975-02-10
1976-08-17
Wilbur, Maynard R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315398, H01J 2978
Patent
active
039756629
ABSTRACT:
In a radar PPI display, digital techniques are utilized to allow an operator to move the point about which the radial trace beam rotates to a point remote from the center of the radar viewing screen and including movement off the screen without actually moving the display beam off the screen. A sweep signal generator detects the location of the operator positioned off-center point from the settings of off-center controls and is responsive to radar range scale and antenna position signals to generate appropriate ramp deflection signals in the proper time sequence to accurately display a selected portion of the plan position indication upon the entire area of the viewing screen. A beam control circuit is responsive to the same signals as the signal generator and to a radar start pulse to determine the exact time the PPI display beam is to be turned on to display selected portions of the plan position indication. In this manner, the display beam is never deflected off the screen but is selectively blanked and unblanked and swept across the viewing screen to display the selected portion of the plan position indication upon the viewing screen as if the radar trace originated off the screen. The signal generator and control circuit cooperate such that when a target under study is in the middle of the screen when range scale is changed, the target will still be in the middle of the screen except that it will be expanded or contracted according to the range scale change.
REFERENCES:
patent: 2717330 (1955-09-01), Meagher et al.
patent: 2720645 (1955-10-01), Sherwin
patent: 2768323 (1956-10-01), Schonover
patent: 2950475 (1960-08-01), Hance
Blum T. M.
Etlinger Louis
Funk Joseph E.
Sanders Associates Inc.
Wilbur Maynard R.
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