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Real-Time Graphics in Command/Control Situation Displays

IP.com Disclosure Number: IPCOM000131487D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Nov-11
Document File: 9 page(s) / 36K

Publishing Venue

Software Patent Institute

Related People

Marvin Fry: AUTHOR [+3]

Abstract

The real-time situation display represents a distinctly more complicated system than that required to solve the typical off-line graphics problem. Real-time graphics applications are becoming more significant as overall interest in graphics increases and the performance of available hardware improves. The definition of a ";real-time"; system is somewhat open to debate since the inevitable introduction of processing delay results in few, if any, actual real-time systems. In this case, we are using the term to mean systems that are designed to portray a real environment as surveyed by sensors such as radars, direction-finders, or visual observers. These systems seek to indicate positions, speeds, identities, and intents of moving air, ground, and naval objects. Real-time graphics applications offer challenges distinct from static presentations common to CAD/CAM

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This record contains textual material that is copyright ©; 1982 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Contact the IEEE Computer Society http://www.computer.org/ (714-821-8380) for copies of the complete work that was the source of this textual material and for all use beyond that as a record from the SPI Database.

Real-Time Graphics in Command/Control Situation Displays

Marvin Fry

Sanders Associates

The real-time situation display represents a distinctly more complicated system than that required to solve the typical off-line graphics problem.

Real-time graphics applications are becoming more significant as overall interest in graphics increases and the performance of available hardware improves. The definition of a "real-time" system is somewhat open to debate since the inevitable introduction of processing delay results in few, if any, actual real-time systems. In this case, we are using the term to mean systems that are designed to portray a real environment as surveyed by sensors such as radars, direction- finders, or visual observers. These systems seek to indicate positions, speeds, identities, and intents of moving air, ground, and naval objects.

Real-time graphics applications offer challenges distinct from static presentations common to CAD/CAM

installations because of their timeliness requirements and input data variability. These factors are important because the current graphics literature, which addresses a variety of manipulations, seldom considers the restrictions imposed by the typical real-time processing environment. For example, if a radar provides new input every n seconds, it will not be acceptable to update the display refresh file at a rate slower than every n seconds.

Graphics problems of this nature are commonly termed "situation display" problems. Examples include military command/control and civilian air traffic control applications or simulations of these applications. The typical display presentation in these instances consists of three

classes of information. First, there is background data which serves as the "anchor" or reference frame. The background will often consist of one or more maps which give geographic meaning to overlaid information.

The second class of data consists of the real-time information received via an interface to sensors or other processing systems. This data will generally convey information to the viewer through its orientation to the background or other intrinsic characteristics such as the symbology employed in its representation. An example of real-time data would be aircraft positions as portrayed in an air traffic control system. In this case, appropriate symbology is used to depict certain types of aircraft.

The third data type concerns "status information." System status information includes all data of interest to the viewer which is not presented relative to t...