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ThomasScherrer

GPS some times fail

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I sit and develop sw for GPS almost everyday,

I have several GPS units located both indoor and outdoor,

I see quite often a huge difference in time to aqure, and the number of sats and NF change from day to day.

I think this can be one of the reasons:

http://gps.ece.cornell.edu/spaceweather.html

also I see a drop when overcasted and rain is also causing signal drops

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I also noticed a difference from time to time in GPS performance. But never looked at more than one unit at a time.

Interesting idea about sun effects.

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I noticed last dec29th a total loss of GPS signal (normally bettwen 8-9 fixes when flying). Is there any URL to see if this day the Sun has any anomalous activity to justify that?

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