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Thread: SR71 Astral Navigation ?
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Old 3rd October 2003 | 20:56
  #9 (permalink)  
avioniker
 
Joined: May 2002
Posts: 132
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From: USA
The GPS takes the four strongest signals. At altitudes above 70K it may be confused by having six or more with equal strength and two or more may be very low on the horizon. The system gets what it sees as an impossible solution.
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