The PRECURSOR satellite is scheduled to be launched into a sun synchronous orbit with an 10:30 right ascending node. The attitude profile needs to fullfill these high level requirements: Point solar generator toward sun when outside eclipse. Also minimize angle between downlink antenna and nadir During eclipse point antenna toward nadir for best communication and…
LNB attenuation
By principle the helix antenna will blank out a certain amount of signal as it is mechanically located in front of the receiving element. A geometrical analysis illustrates why and gives a good indication of the attenuation order of magnitude.Assume an opening angle of the LNB of 50 deg. The helix shade from the LNB…