Simple methods for calculating the azimuthal coverage of high frequency directional antennas
Abstract
Spherical trigonometry formulas employing auxiliary quantities because of their suitability for use with hand held electronic calculators are emphasized. The relationships between sides and angles of oblique spherical triangles are listed, and the value of applying tests based on these relationships prior to making detailed solutions of spherical triangle problems is demonstrated. Various approaches to obtaining great circle distances and bearings are examined, and the advantage of the auxiliary quantities method when using an electronic calculator are shown.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 February 1981
 Bibcode:
 1981STIN...8221500M
 Keywords:

 Algorithms;
 Antenna Radiation Patterns;
 Azimuth;
 Bearing (Direction);
 Directional Antennas;
 Elevation Angle;
 Calculators;
 Distance;
 High Frequencies;
 Position (Location);
 Spheres;
 Triangles;
 Trigonometry;
 Communications and Radar