Specifically for high altitude amateur rocketry, how is altitude determined when you get too high(too low pressure) for barometric altimeters to work? I heard about GPS, however, COCOM limitations seem to make this impossible.
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The discussion in the Raspberry Pi forums is actually quite helpful. It mentions the Adafruit Ultimate GPS which states the 515 m/s velocity limit. While the PDFs state 18,000 meter altitude limit, the VIDEO (found here) states 50 kilometers. – uhoh Mar 11 '19 at 23:31
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There is [additional discussion in community.balloonchallenge.org of GPS units which work at high-altitude, but at low speed. These are high altitude balloon applications. Also in this post in Ars Technica Openforum See also Current situation with CoCom regulations and GPS receivers for balloons and cubesats – uhoh Mar 11 '19 at 23:33
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1Measuring distance and doppler speed relative to a radio control ground station as well as direction and compute altitude using these values? – Uwe Mar 12 '19 at 10:41
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2A serious amateur can build their own, unrestricted, GPS receiver or hack an off the shelf module to bypass the restrictions. – Dragongeek Mar 12 '19 at 11:24
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@Dragongeek references to hacking of firmware at the end of this post and in comments below this post. "partial hacking" discussed in this post. – uhoh Mar 13 '19 at 06:51