Evolution of a Spacecraft Antenna System
Abstract
Following the original spin-stabilized spacecraft (Syncom, Telstar, Relay), the later series-Applications Technology Satellites and Intelsat spacecraft-feature a mechanically rotatable antenna, capable of counter-spinning and pointing a high-gain beam at earth. This feature is an anachronism in the age of electronically collimated and actuated spacecraft antenna systems. The mechanically despun antenna has evolved from a simple, rotatable planar reflector to a more sophisticated multi-frequency, attitude-sensing, high gain antenna for deep space (galactic) probes, tactical communications, and community broadcast applications. The spur of this evolution has been the goal of a two to five year lifetime in space environment with simple mechanical mechanisms, low power consumption, high communications gain, and low noise and magnetic "spillage". The developmental efforts have yielded precise, pulse-driven motors, instrument bearings, lubrication techniques and high reliability electronic circuits. The proofs of the design concepts are the actual flight experiences of the NASA ATS III mechanical antenna system, which, since its November 1967 launch, has performed admirably to date; the Intelsat III system antenna system derived from the predecessor reflective antenna design, and the extension to a military, high capacity despun antenna platform system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1971
- Accession Number
- ADA376991
Entities
People
- A. Kampinsky
Organizations
- National Aeronautics and Space Administration