Passive measurements from EESS satellites near the water vapor absorption line at 22.2 GHz are essential not only for measuring atmospheric water vapor but also for reducing error in other geophysical parameters due to the presence of water vapor, especially in moist atmospheres. For example, the accuracy in measuring sea surface wind speed, sea surface temperature, liquid cloud water or precipitation would significantly degrade if the 22 GHz water vapor channel was not present or unusable due to RFI contamination.

Conclusion: The primary concern regarding a possible space research service (Earth-to-space) uplink within the band 22.55-23.15 GHz is the EESS primary allocation at 22.21-22.5 GHz. To protect EESS satellite observations from interference, ITU-R RS.1029 recommends a maximum interference level in the 22.21-22.5 GHz band of -249 dBW/Hz, with this interference level not to be exceeded for more than 0.1% of the sensor viewing area or measurement time.

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