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RECOMMENDATION ITU-R RS.1166-4    2
Performance and interference criteria for active spaceborne sensors    2
Scope    2
Annex 1 Performance and interference criteria for spaceborne active sensors    5
1    Introduction 5
2    Altimeters 5
       2.1    Performance criteria 5
       2.2    Interference criteria 5
3    Scatterometers 6
       3.1    Performance criteria 7
       3.2    Interference criteria 8
4    Precipitation radars 9
       4.1    Precipitation radars based upon TRMM    10
                 4.1.1    Performance criteria 10
                 4.1.2    Interference criteria 10
       4.2    Precipitation radars based upon TRMM follow-on 11
                 4.2.1    Introduction 11
                 4.2.2    TRMM follow-on and 35 GHz band precipitation radar 11
                 4.2.3    Technical characteristics of the 35 GHz precipitation radar 11
                 4.2.4    Performance and interference criteria 12
5    Synthetic aperture radars 12
       5.1    Performance criteria of SARs 13
       5.2    Interference criteria of SAR   13
                 5.2.1    Processing gain of noise 14
                 5.2.2    Range processing gain of interference signals 15
                 5.2.3    Azimuth processing gain of pulsed interference signals 16
                 5.2.4    Calculation of allowable interference 17
                 5.2.5    Input/output signal characteristics of SAR operating in the bands 432-438 MHz and 1 215-1 300 MHz    18
                 5.2.6    Input/output signal characteristics of SARs operating in the bands 3 100-3 300 MHz and 5 250-5 570 MHz    18
                 5.2.7    Input/output signal characteristics of SARs operating in the bands 8 550-8 650 MHz and 9 300-9 900 MHz    19
                 5.2.8    Interference criteria 20
                 5.2.9    Availability criterion 20
6    Cloud profile radars 20
       6.1    Performance criteria for 94 GHz cloud profile radar 20
       6.2    Interference criteria of the cloud profile radar 20
       6.3    Availability criteria of the cloud profile radar 20

CONTENTS