摘要: The relative variation in the pattern function for a 32 element, multi-beam EHF satellite phased array has been incorporated into the equation for downlink margin. The corrected margin is used to determine allowable rain attenuati... 展开 The relative variation in the pattern function for a 32 element, multi-beam EHF satellite phased array has been incorporated into the equation for downlink margin. The corrected margin is used to determine allowable rain attenuation (dB) and predict link availability based on Crane's 8 region world wide rain rate distribution and climate model. Link availability contours are computed for the cases of a 31 beam and 37 beam phased array. Four equi-spaced geostationary satellites are required for either configuration in order to provide 0.99 (or greater) link availability to all points within the 10 deg. elevation angle field of view for the nominal value of downlink margin and a frequency of 20.7 GHz. (Author) 收起