Accession Number:

AD0276696

Title:

INVESTIGATION OF DIGITAL TECHNIQUES FOR RADAR LAND MASS SIMULATION

Descriptive Note:

Corporate Author:

PENNSYLVANIA RESEARCH ASSOCIATES INC PHILADELPHIA

Personal Author(s):

Report Date:

1962-02-19

Pagination or Media Count:

1.0

Abstract:

The extent to which digital computing techniques may afford improved performance in the real-time simulation of airborne radars is investigated. It is desired to reproduce the display formed by a scanning ground-mapping radar having a range of 200 miles and a resolution of 100 feet. The simulated radar is mounted in an aircraft that flies at a maximum speed of mach 3 at any altitude up to 60,000 feet. To simulate such a radar in real time without advance knowledge of the flight path or maneuvers of the aircraft, a conventionally organized computer would need bit rates in the order of nanoseconds to perform the required calculations. Reductions in this requirement can be effected by a reorganization of the logic for this special-purpose application, such as predicting where along the terrain the radar will be looking at a future time and instituting the appropriate calculations on a large region rather than on each discretely resolvable point of the terrain. Then if advantage is taken of known characteristics of the terrain and the radar, analog devices may be assigned under control of the digital computer for the highfrequency pattern- and function-generation. Thus the economically feasible method, using present components and devices, is to use a hybrid computer which performs the storage and decision-making functions and sets parameters into analog devices for construction of the intensity-modulated display waveform. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE