Thank you David for the return,... 
 
Detailed information of the orientation systems and positioning is what I look 
for,  
but it is reasonable that some information is reserved.  
  
I will try to find all the information that is possible to help me to guide my 
own experiments about this matter..  
  
Thank you again   

73..Luis
CX2AN
  ----- Original Message ----- 
  From: g0...@aol.com 
  To: j...@fing.edu.uy 
  Sent: Saturday, March 06, 2010 3:07 PM
  Subject: Re: [amsat-bb] help, LEO navigational question


  In a message dated 06/03/2010 16:31:40 GMT Standard Time, j...@fing.edu.uy 
writes:
    Hi all,...

    I want to learn about horizon detection, orientation and automatic control 
of attitude of LEO. satellites.  
    Can somebody guide my search of information about this topic?

    73..Luis
    CX2AN

  Attitude control is usually done in LEO with "magnetorquer coils", or 
"reaction wheels" or "attitude thrusters"

  Attitude determination can be done in several ways By "sun sensor" "horizon 
sensor" "Star tracker" or by comparing the detected magnetic field on the 
satellite against a model of the earths magnetic field stored in memory.

  If you search for the above topics you will find papers from teams who have 
implemented satellite control using these methods. Of course the computer 
algorithms to process the data collected and calculate attitude is complex.

  You will not get detailed information from the USA due to their ITAR laws.

  73

  David
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