Accession Number:

AD0614887

Title:

A PROPOSED SPACECRAFT-TO-EARTH COMMUNICATIONS LINK; THE UNIFIED CARRIER APPROACH,

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Report Date:

1963-08-28

Pagination or Media Count:

11.0

Abstract:

This paper documents the design and performance of a proposed unified carrier, range-tracking, and communications system for cislunar ranges in which phaselocked loop techniques are used in the spacecraft to relate received and transmitted carriers coherently. The design of the composite angle-modulated carrier waveform for the spacecraft-to-ground link has been accomplished by using a statistical method of waveform design. The pseudonoise ranging code is biphase telemetry is pulse-code modulated PCM and voice is frequency modulated FM. The best selection of modulation parameters and frequency locations for the various functions has been determined by a method of successive iteration. The unified carrier system has been tested for a simulated lunar mission for spacecraft velocities of 36,000 ftsec feet per second, and the results indicate that the statistical method of waveform design used is practical for this case. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE