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…
Autor: Patric
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…