The levels are calculated under specific assumptions given in Recommendation ITU-R RA.769, in * particular with an integration time of 2 000 s. (1) are the frequency bands listed in Recommendation ITU-R RA.769; eight further bands are allocated to the radio astronomy service on a primary basis via RR No. 5.555. (2) Not listed in Table 2 of Recommendation ITU-R RA.769. (3) Not listed in Table 1 of Recommendation ITU-R RA.769. 3 Earth exploration-satellite and meteorological-satellite passive sensing (Recommendation ITUR SA.1029) The permissible interference levels in Table 9 are based on Recommendation ITUR SA.1029. They refer to power levels at the receiver input and do not include characteristics of the receiving antenna. The gain of the receiving antenna may be inferred from the values of resolution (km) given in Table 2 of Recommendation ITU-R SA.515 and the knowledge that a typical orbital altitude for spaceborne remote sensors can be taken as 500 km. Note that for spaceborne remote sensing, the sensor antenna is normally directed at the Earth’s surface. Note that the levels in Table 9 are described as permissible in the context that they meet the interference criteria of passive sensors. However, use of permissible may not necessarily conform with a strict regulatory definition. TABLE 9 Permissible interference levels at the receiver input for passive sensing Interference reference Frequency Interference level bandwidth (GHz) (dBW) (MHz) 1.4-1.427 27 –171 2.69-2.7 10 –174 4.2-4.4 100 –161 6.5-6.7 100 –164 10.6-10.7 20 –163 15.2-15.4 50 –166 18.6-18.8 100 –155(1) 21.2-21.4 100 –163 22.21-22.5 100 –160 23.6-24 100 –163 31.3-31.8 100 –163 36-37 100 –156 50.2-50.4 100 –161/–166(2) 52.6-59 100 –161/–166(2) 60.3-61.3 100 –161/–166(2) 86-92 200 –153 100-102 200 –160
* The levels are calculated under specific assumptions given in Recommendation ITU-R RA.769, in particular with an integration time of 2 000 s. (1) are the frequency bands listed in Recommendation ITU-R RA.769; eight further bands are allocated to the radio astronomy service on a primary basis via RR No. 5.555. (2) Not listed in Table 2 of Recommendation ITU-R RA.769. (3) Not listed in Table 1 of Recommendation ITU-R RA.769. 3 Earth exploration-satellite and meteorological-satellite passive sensing (Recommendation ITUR SA.1029) The permissible interference levels in Table 9 are based on Recommendation ITUR SA.1029. They refer to power levels at the receiver input and do not include characteristics of the receiving antenna. The gain of the receiving antenna may be inferred from the values of resolution (km) given in Table 2 of Recommendation ITU-R SA.515 and the knowledge that a typical orbital altitude for spaceborne remote sensors can be taken as 500 km. Note that for spaceborne remote sensing, the sensor antenna is normally directed at the Earth’s surface. Note that the levels in Table 9 are described as permissible in the context that they meet the interference criteria of passive sensors. However, use of permissible may not necessarily conform with a strict regulatory definition. TABLE 9 Permissible interference levels at the receiver input for passive sensing Frequency (GHz) Interference level (dBW) Interference reference bandwidth (MHz) 1.4-1.427 –171 27 2.69-2.7 –174 10 4.2-4.4 –161 100 6.5-6.7 –164 100 10.6-10.7 –163 20 15.2-15.4 –166 50 18.6-18.8 –155(1) 100 21.2-21.4 –163 100 22.21-22.5 –160 100 23.6-24 –163 100 31.3-31.8 –163 100 36-37 –156 100 50.2-50.4 –161/–166(2) 100 52.6-59 –161/–166(2) 100 60.3-61.3 –161/–166(2) 100 86-92 –153 200 100-102 –160 200