Determining the azimuthal distribution of noise and interference across the HF spectrum at the RAE Receiving Station, Cobbett Hill, Surrey, England
Abstract
An increasing interest in techniques for nulling out unwanted signals and interference in the HF band makes it more important to establish not only the magnitude of the signals but the direction from which they are emanating and whether they are of a spasmodic or continuous nature. The Royal Aircraft Establishment (RAE) has been anxious for some time to build up a data base of such information from which statistical trends may be derived and applied to research into more effective HF communications systems for the Royal Air Force. Given here is a simple outline of a measurement system built around a Multi-Vee antenna, a Rohde and Schwarz ESH3 measurement receiver and a Hewlett Packard HP9836 computer all installed at the RAE Receiving Station, Cobbett Hill. The various formats available on the HP9836 computer for displaying the data, for example, Signal versus Time and Signal versus Direction, etc., are given. Data acquired from this system has so far been based upon two measurement methods. The first takes up to five frequencies of interest across the band and measures these at the same time or times on consecutive days in an effort to determine the constancy or otherwise of the direction and magnitude of the interfering signals. The second approach has been to evaluate the measurement system as a means of gathering data on channel occupancy.
- Publication:
-
In AGARD
- Pub Date:
- December 1988
- Bibcode:
- 1988eeni.agarU....S
- Keywords:
-
- Azimuth;
- Data Bases;
- Distribution (Property);
- Frequency Measurement;
- High Frequencies;
- Radio Frequency Interference;
- Radio Spectra;
- Digital Computers;
- Radio Antennas;
- Radio Receivers;
- Communications and Radar