Accession Number : ADA304494

Title :   Modular Reflector Concept Study.

Descriptive Note : Contract rept. Apr 79-Feb 80,

Corporate Author : GENERAL DYNAMICS CORP SAN DIEGO CA

Personal Author(s) : Vaughan, D. H.

PDF Url : ADA304494

Report Date : MAR 1981

Pagination or Media Count : 120

Abstract : A study was conducted to evaluate the feasibility of space-erecting a 100-meter paraboloidal R.F. reflector by joining a number of individually deployed structural modules. Three module design concepts were considered: (1) the Deployable Cell Module (DCM), (2) the Modular Paraboloidal Erectable Truss Antenna (Mod-PETA), and (3) the Modular Erectable Truss Antenna (META). With the space shuttle (STS) as the launch system, the methodology of packaging and stowing in the orbiter, and of dispensing, deploying and joining, in orbit, were studied and the necessary support equipment identified. The structural performance of the completed reflectors was evaluated and their overall operational capability and feasibility were evaluated and compared. The potential of the three concepts to maintain stable shape in the space environment was determined. Their ability to operate at radio frequencies of 1 GHz and higher was assessed assuming the reflector surface to consist of a number of flat, hexagonal facets. A parametric study was performed to determine figure degradation as a function of reflector size, flat facet size and f/D ratio.

Descriptors :   *MODULAR CONSTRUCTION, *SPACECRAFT ANTENNAS, DEPLOYMENT, PARAMETRIC ANALYSIS, DEGRADATION, SIZES(DIMENSIONS), SPACE ENVIRONMENTS, STRUCTURAL PROPERTIES, SPACE SHUTTLES, LAUNCHING, PACKAGING, TRUSSES, ELECTROMAGNETIC WAVE REFLECTIONS, REFLECTORS, ULTRAHIGH FREQUENCY, SUPERHIGH FREQUENCY, PARABOLIC ANTENNAS.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE