CONTENTS

Annex 1 - Method for calculating the minimum angle, subtended at the Earth’s surface, between a HEO satellite within its active arc and the visible portion of the geostationary orbit     
Annex 2 - Calculation of increase in GSO link noise due to interference from a HEO satellite at the start of its active arc     
Annex 3 - Iterative implementation of the methodology in Annex 1     
Annex 4 - Examples of application of the methodology of Annex 1     
Annex 5 - Method for calculating the minimum angle, subtended at the Earth’s surface within the footprint of a beam of a geostationary satellite at a given longitude, between that satellite and a HEO satellite within its active arc     
 1     Plane geometry of an elliptical orbit      
 2     Calculation of geographical coordinates of an “active” HEO satellite  
 3     Calculation of minimum separation angle          
Annex 6 - Examples of applying of the methodology of Annex 5