Adaptive Antenna Control
Abstract
The Adaptive Antenna Control (AAC) program seeks to improve the performance and availability of DCS troposcatter and diffraction links by means of adapting the antenna response to compensate for variations in the angle of arrival of the received radio signal. Particular emphasis is to be placed on AAC techniques which mitigate aperture-to-medium coupling loss. The program consists of a study phase, the development of AAC equipment, and a test phase. This interim technical report summaries the program activities during the first 6 months of the 18 month contract effort. The major accomplishments in this initial period were: identification of vertical angle diversity as the most cost and performance effective AAC technique for troposcatter systems; Identification of an electronically controlled movable feedhorn system as the most effective method of tracking angle of arrival variations in trans-horizon systems dominated by diffraction propagation; development of a comprehensive troposcatter computer model for prediction of multipath spread, aperture to medium coupling loss, and angle diversity parameters. The report presents the theoretical basis for the troposcatter model and presents results of multipath and aperture to medium coupling loss calculations.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1977
- Accession Number
- ADA044416
Entities
People
- John N. Pierce
- Peter Monsen
- Steen Parl