TABLE 2.10 Data from WMO Preliminary Position Paper, September 28, 2009


Frequency Band MSS Direction Meteorological Applications Concerned

4 400-4 500 MHz DL or UL
4 800-4 990 MHz UL
5 150-5 250 MHz DL
7 055-7 250 MHz DL Passive sensing
7 750-7 900 MHz UL MetSat
8 400-8 500 MHz UL
10.5-10.6 GHz DL, but UL might also be considered Passive sensing (adjacent band)
13.25-13.4 GHz DL Active sensing
14.8-15.35 GHz DL or UL

NOTE: DL, downlink, UL, uplink.

There are a number of active applications of EESS in the frequency range of interest, including 5.4 GHz which is used by the ESA ASCAT for ocean wind and ocean current measurement, and 13.4 GHz which has been used by NASA for ocean wind sensing. These sensors are used operationally in weather and storm prediction. Interference degrades the measurement accuracy, resulting in loss of coverage and adversely impacting forecasting capability. Other examples of active applications are spaceborne synthetic aperture radars (SARs) such as RADARSAT2 (5.355-5.455 GHz) and TerraSAR-X (9.05-10.05 GHz).

Recommendation: Per International Footnote 5.458, “Administrations [are urged to] bear in mind the needs of the Earth exploration-satellite (passive) and space research (passive) services in their future planning” of this frequency range to protect current and future spaceborne observatories.



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