CONTENTS

RECOMMENDATION  ITU-R  SF.1649-1     2
Guidance for determination of interference from earth stations on board vessels to stations in the fixed service when the earth station on  board vessels is within the minimum distance     2
Scope     2
Annex 1   Guidance for identifying and using points on the operating contour for the determination of interference from emissions from an ESV in motion to a station in the fixed service (critical contour point method)     5
1 Introduction  5
2 Considerations in determining the CCP  6
        2.1 Stationary operation  6
        2.2 In-motion operation  6
                  2.2.1 Identification of the CCP for each potentially-affected FS receiver 6
                  2.2.2 Consideration of long-term interference  8
                  2.2.3 Consideration of short-term interference  8
3 Application of CCP methodology in identifying available spectrum   9
Annex 2  The calculation of interference from ESVs     9
1 Introduction  9
2 Minimum required propagation loss for a fixed percentage of time with stationary stations  10
3 Implications of time variations in parameters other than propagation loss  12
        3.1 Short-term interference consideration  12
       3.2 Long-term interference consideration  13
4 Detailed consideration of long-term interference  14
        4.1 Contribution from a main beam passage to the average interference power 14
        4.2 Contribution to the average interference power from a segment without a main beam intersection     17
        4.3 Aggregate average interference power from an operating contour 18
5 Detailed consideration of short-term interference  19
6 Summary  21
Annex 3   Alternative method for calculation of interference from ESVs     21
1 Introduction  21
2 Simulation procedure  22
3 Determination of the occurrence of short-term interference through simulation  22
4 Determination of long-term interference through simulation  23
5 Fast simulation procedures  24
6 Determination of full interference power distribution through simulation  24
Annex 4  Technical parameters required for smaller antenna compliance in the 14 GHz band     25
 1     Compliance with intersystem coordination agreements  25
2 Effect on the minimum distance given in Recommendation ITU-R SF.1650-1  26