How to find azimuth and elevation from satellite of a ground station when yaw, pitch, roll, lat, long position of satellite and lat, long position on ground are given?

aflong = 10.3082;% Earth Station Longitude (degrees)
aflat = -6.0636; % Earth Station Latitude (degrees)
lslong = 0;      % Satellite Longitude (degrees)
lslat = 0;       % Satellite Latitude (degrees)
lspol = 0;       % Satellite Polarization (degrees)
alt = 700;       % Satellite altitude (Km)    
yaw = 0;         % yaw(degrees)
pitch = 54.7356; % pitch(degrees)
roll = 0;        % roll(degrees)
  • 3
    $\begingroup$ Seems like you would need to know the satellite's altitude as well. $\endgroup$ – Steve Linton Oct 12 '18 at 12:01
  • $\begingroup$ I almost posted an answer based only on deviations from the nadir line, but it didn't use pitch, roll, and yaw. Can you explain how your "altitude-azimuth" coordinate system uses satellite attitude, if it does? $\endgroup$ – uhoh Oct 13 '18 at 2:10
  • 1
    $\begingroup$ @kartheek I would love to help, but your question is not clear. The terms Altitude and Azimuth apply to a surface with a horizon, like the Earth. Satellites do not have these terms. Please add some more information about this. If it is a written problem, include some more text. If it is in a different language, I think that's fine as long as we work to translate some of it into English. The Altitude and Azimuth of a satellite is your idea, then please try to explain further what you need. Don't worry about imperfect English, just somehow add something further. Thanks! $\endgroup$ – uhoh Oct 13 '18 at 9:27
  • 1
    $\begingroup$ @kartheek The pitch/roll and yaw are the attitude of the satellite with respect to something, e.g. the flight path. If you know where that is facing then its easier to say whether one should look left or right to find the ground station. Thereafter you need to know where the Antenna is located, or more specifically how its Alt/Azimuth relates to the pitch/roll/yaw body axes. $\endgroup$ – Puffin Oct 13 '18 at 10:06
  • 1
    $\begingroup$ As others have said, you need to define what you mean by Az/El in this context. I'm guessing you are referencing Az/El to the spacecraft's body. In that case you need to transform the pointing vector (from the s/c to the g/s) to the spacecraft's body coordinate frame via a rotation matrix based on Yaw/Roll/Pitch. Once you have the pointing vector in the body reference frame, you can convert it to an Az/El (based on that same body reference frame) $\endgroup$ – Carlos N Oct 15 '18 at 21:23

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.