Accession Number:

AD0602003

Title:

SYSTEM STUDY FOR SUPER MOBILE COMMUNICATIONS SATELLITE GROUND STATION.

Descriptive Note:

Quarterly rept. no. 3, 1 Jan-31 Mar 64

Corporate Author:

PENNSYLVANIA UNIV PHILADELPHIA MOORE SCHOOL OF ELECTRICAL ENGINEERING

Report Date:

1964-04-30

Pagination or Media Count:

118.0

Abstract:

The work included analyses of certain digital modulation systems which are potential competitors to the analog systems reviewed earlier, analysis of antenna noise, further develop ment of antenna array systems, a development of a method for field calculation of antenna pointing directions, and a survey of existing and potential low noise receiving systems. The modulation studies indicate that only scant improvement over the capability of angle modulation feedback techniques are possible with digital systems - assuming the published results on the former are correct. The conclusion is based on analyses carried out on several multistate PCM transmission systems. One of these, using a weighted pulse duration, the weighting being dependent on the significance of the information represented by the pulse does not appear to have been studied before. It gave better results than a single error coded system, a deltasigma system, and of course, an unweighted system. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE