Accession Number : AD0282787

Title :   LUNAR TRACKER MATHEMATICAL TECHNIQUES AND DIGITAL SIMULATION

Corporate Author : NORTHROP AIRCRAFT INC HAWTHORNE CALIF

Personal Author(s) : GOODMAN,G.J. ; FREUND,R.B. ; KENNEDY,H.B.

Report Date : DEC 1962

Pagination or Media Count : 1

Abstract : Optical techniques for lunar flight midcourse tracking of the center of the partially illuminated moon were studied and an experimental model of a complete tracking system based on one of the techniques was designed, fabricated and tested. Consideration is given to the mathematical techniques and the digital simulation of the experimental tracker whose axis is directed toward the center of the moon by means of three measurements of the distance from the axis to the image of the bright limb. The scanning system analytical model, control computer equations, closed-loop servo equations, random errors, and certain hardware nonlinearities included in the simulation are discussed and simulation results are presented in graphical form. Also presented are two promising methods for extension of the mathematical techniques of the experimental model to close range planet tracking. (Author)

Descriptors :   *CELESTIAL NAVIGATION, *LUNAR PROBES, *OPTICAL TRACKING, DIGITAL COMPUTERS, GEOMETRY, ILLUMINATION, MOON, SIMULATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE