Accession Number:

AD0261475

Title:

AN ORBIT COMPUTER FOR A SATELLITE POSITION DISPLAY

Descriptive Note:

Interim rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1961-07-31

Pagination or Media Count:

39.0

Abstract:

A display suitable for presenting earth satellite information on shipboard is being investigated. This study investigates the computational phase of the problem. A combination of digital and analog techniques, with servo amplifiers to position the shafts of magnetic resolvers which generate sine and cosine functions, is proposed to implement equations derived for the calculation of satellite height and of subsatellite position as latitude and longitude. Orbital elements and initial conditions are selected for up to ten satellites out of the total in a digital store, and positions are computed for each in turn at any arbitrary time. Computer output appears in digital form and, depending upon display design, may be either placed in a register or displayed directly. Essentially continuous orbits can be computed as a succession of subsatellite positions corresponding to small discrete increments in time through an anomalistic period bracketing the selected epoch. According to display design, the resulting subsatellite track will be either displayed directly or stored in a scan-converter cathode-ray tube. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE