PPI Display for radar and synthetic symbology
First Claim
1. In a radar system including an antenna scannable in azimuth for receiving radar return data, apparatus for displaying said radar return data, comprisingradar data memory means for storing radar return data corresponding to a complete scan of said antenna,display means including a display face,rotating scan generation means coupled to said display means for generating a PPI display scan with respect to said display face rotating at a rate independent of the azimuth scanning rate of said antenna,addressing means for addressing said radar data memory means in synchronism with the generation of said PPI display scan for providing said radar return data stored therein, andmeans for applying said stored radar return data addressed by said addressing means to said display means for displaying said addressed radar return data in synchronism with said rotating scan.
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Accused Products
Abstract
A complete frame of radar data is stored in radar real time addressed in accordance with antenna azimuth. The PPI rotating display scan is generated by deflecting the beam along the azimuth sweeps thereof under control of X-rate and Y-rate signals provided for each sweep. The X-rate and Y-rate signals are applied sequentially to X and Y binary rate multipliers which generate clock signals at a frequency proportional to the rate signals. The clock signals are applied to X and Y position counters respectively for generating the X and Y deflection signals via digital-to-analog converters. Sequential application of the X and Y rate signals to the X and Y rate multipliers generates the rotating scan. The radar data stored in memory is accessed in accordance with the azimuth address in synchronism with the generation of the azimuth display sweeps. The stored data provides the video signal for the display tube so as to generate the radar display. The rotating scan is generated in non-real radar time at a rapid rate. X-rate and Y-rate signals are also applied to the binary rate multipliers for generating concatenated straight line strokes to display synthetic symbology. ΔX and ΔY signals are utilized to control the lengths of the strokes.
17 Citations
19 Claims
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1. In a radar system including an antenna scannable in azimuth for receiving radar return data, apparatus for displaying said radar return data, comprising
radar data memory means for storing radar return data corresponding to a complete scan of said antenna, display means including a display face, rotating scan generation means coupled to said display means for generating a PPI display scan with respect to said display face rotating at a rate independent of the azimuth scanning rate of said antenna, addressing means for addressing said radar data memory means in synchronism with the generation of said PPI display scan for providing said radar return data stored therein, and means for applying said stored radar return data addressed by said addressing means to said display means for displaying said addressed radar return data in synchronism with said rotating scan.
Specification