Litton Systems, Inc.

Ray C Pizzuti

Fred W Erickson

John B Rodwig

The Radar Scan Converter receives range and azimuth data that is generated by a conventional radar and presented in a polar coordinate system, and processes and displays this data, in real time, on a conventional generally rectangular display screen which has a display formed by a relatively large number of pixels organized in the X- and Y-axes of a Cartesian coordinate system. The Radar Scan Converter sequentially updates each pixel in the display by (1) selecting a pixel address in the Cartesian coordinate system, (2) determining the corresponding cell address in a direct display memory interface, (3) reading the video level in this corresponding cell, (4) then responsive to this respective video level, either initially loading or subsequently updating the associated pixel in a screen image memory, and (5) refreshing the display from the screen image memory through respective cycles over repeated radar scans. The Radar Scan Converter System displays shades of gray or color, which may represent one or more video levels. It also has an image decay capability over repeated radar scans through its preferred use of initially rotating video stored in the screen image memory and subsequently unrotating it by an increasing value during the display refresh cycles.

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Woodland Hills, CA, United States of America

Ray C Pizzuti