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May 14th, 2015, 08:31 AM  #1 
Newbie Joined: May 2015 From: Denmark Posts: 3 Thanks: 0  Trigonometry question in satellite communication
Hello everybody, I need help in finding the right position on the globe of an observer that looks on a geosynchronous satellite (the ones that fly right above the equator line). I know the position of the satellite, and the unit vector of the antenna pointing (azimuth and elevation) and I need to find latitude and longitude of the observer. Here I have the reverse way. The knowns are the satellite position and latitude and longitude of the observer and the unknown is the unit vector or the way the antenna looks in relation with a tangent plane of the given position. https://drive.google.com/openid=0B7D...X3c&authuser=0 I don't get the way they used the rotational matrix for transfering the values between the systems. Here I have a representational picture: Any help will be appreciated. BR, Andrian Buchi 
May 14th, 2015, 08:33 AM  #2 
Newbie Joined: May 2015 From: Denmark Posts: 3 Thanks: 0  Trigonometry problem for satellite communication
Hello everybody, I need help in finding the right position on the globe of an observer that looks on a geosynchronous satellite (the ones that fly right above the equator line). I know the position of the satellite, and the unit vector of the antenna pointing (azimuth and elevation) and I need to find latitude and longitude of the observer. Here I have the reverse way. The knowns are the satellite position and latitude and longitude of the observer and the unknown is the unit vector or the way the antenna looks in relation with a tangent plane of the given position. https://drive.google.com/openid=0B7D...X3c&authuser=0 I don't get the way they used the rotational matrix for transfering the values between the systems. Here I have a representational picture: Any help will be appreciated. BR, Andrian Buchi 
May 18th, 2015, 12:39 AM  #3 
Senior Member Joined: May 2015 From: Varanasi Posts: 110 Thanks: 5 Math Focus: Calculus 
I am unable to understand if you want to calculate the unit vector from the tangent at the observers coordinate to the position of the satellite. Then i think that the vector would always be perpendicular to this tangent plane.Pardon me if i am wrong.

May 18th, 2015, 05:18 AM  #4 
Newbie Joined: May 2015 From: Denmark Posts: 3 Thanks: 0 
Yes you're right about that. But I'm looking for the observer position in latitude and longitude terms. 

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