CONTENTS

RECOMMENDATION  ITU-R  F.1819     1
Protection of the radio astronomy service in the 48.94-49.04 GHz  band from unwanted emissions from HAPS in the  47.2-47.5 GHz and 47.9-48.2 GHz bands     1
Scope     1
Annex 1  Methodology to determine the minimum separation between a RAS antenna  and the nadir of a HAPS platform     2
1 Introduction  2
2 System characteristics  2
        2.1 The HAPS system   2
        2.2 Threshold levels of interference detrimental to the radio astronomy service  2
        2.3 Interference mitigation techniques  3
        2.4 Interference scenario  3
        2.5 Basic transmission loss  4
        2.6 Study results  5
3 Minimum separation distance of RAS antenna and nadir of HAPS platform station for protection of radio astronomy service     7