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can anyone source an explicit formula for calculating the elevation angle for a GPS satellite as seen from a receiver. I can't seem to find one. Even a text reference would be great. I couldn't quite find anything posted already that does the same thing.

I'm also looking for something similar for calculating elevation but for Glonass satellites as well.

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Is the GNSS receiver providing NMEA data? If so, is the GSV sentence provided? If so, the elevation in degrees is provided in that specific sentence.

http://aprs.gids.nl/nmea/#gsv

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I found this image that hints at the formula: enter image description here

(the original image is at http://help.agi.com/stk/Content/stk/images/xconstraints-1.gif.pagespeed.ic.YpPTo2N_zh.png)

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