ART21 – 64 – Section V − Limits of power flux-density from space stations MOD TABLE 21-4 (continued) (Rev.WRC-15) Frequency band Service* Limit in dB(W/m2) for angles of arrival (δ) above the horizontal plane Reference bandwidth 0°-5° 5°-25° 25°-90° 8 025-8 500 MHz Earth exploration-satellite (space-to-Earth) Space research (space-to-Earth) −150 −150 + 0.5(δ − 5) −140 4 kHz 9 900-10 400 MHz Earth exploration-satellite (active) 0°-5.7° 5.7°-53° 53 -90 1 MHz −11314A −109 + 25 log(δ − 5) 14A −66.614A 10.7-11.7 GHz Fixed-satellite (space-to-Earth) (geostationary-satellite orbit) 0°-5° 5°-25° 25 -90 4 kHz −150 −150 + 0.5(δ − 5) −140 _______________ 14A 21.16.8 The pfd values given for EESS (active) are mean pfd values defined as follows: pfd()P 10log()10log(PRF)30 10log(Bc)Gt ()10log 4 d 2 () where: P: RF peak power at the input of the antenna of the SAR satellite (dBW) τ: SAR pulse length (μs) PRF: SAR pulse repetition frequency (kHz) δ: elevation angle of the EESS SAR satellite above ground, in the vertical plane (perpendicular to the satellite orbit) (°) Bc: SAR emission bandwidth (MHz) Gt(δ):transmit antenna gain of the SAR satellite in the vertical plane (perpendicular to the satellite orbit) for the elevation angle considered (dBi) d(δ): distance between the SAR satellite and the ground for the elevation angle δconsidered (m). (WRC-15)