Bruce
Well-Known Member
- Joined
- Feb 20, 2019
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I'd like to eventually try for a Tripoli altitude record and was wondering what GPS might be the best for extremely high flights?
I realize that a lot of research and hard work goes into every record attempt. Even if I never do make it above 150,000 feet, I'd still like to have a GPS that's capable of it.
I read of the COCOM Limits,
https://en.wikipedia.org/wiki/Coordinating_Committee_for_Multilateral_Export_Controls
"a limit placed on GPS tracking devices that disables tracking when the device calculates that it is moving faster than 1,000 knots (1,900 km/h; 1,200 mph) at an altitude higher than 18,000 m (59,000 ft).[3] This was intended to prevent the use of GPS in intercontinental ballistic missile-like applications."
How is this dealt with for high altitude rocket flights?
Ideally I'd like to have a GPS that saves the flight data onboard as well as sends it back to the ground in real time. Just to cover all the bases...
It seems like a fast rocket would have the best chance of a straight vertical flight. I would think that the fins stabilizing effect would diminish as the rocket ascends since the air is getting thinner as you go up. So a fast rocket with its greater momentum would hopefully stay on course better than a slower rocket.
But normal GPSes don't work if you go too fast. What's the solution?
I realize that a lot of research and hard work goes into every record attempt. Even if I never do make it above 150,000 feet, I'd still like to have a GPS that's capable of it.
I read of the COCOM Limits,
https://en.wikipedia.org/wiki/Coordinating_Committee_for_Multilateral_Export_Controls
"a limit placed on GPS tracking devices that disables tracking when the device calculates that it is moving faster than 1,000 knots (1,900 km/h; 1,200 mph) at an altitude higher than 18,000 m (59,000 ft).[3] This was intended to prevent the use of GPS in intercontinental ballistic missile-like applications."
How is this dealt with for high altitude rocket flights?
Ideally I'd like to have a GPS that saves the flight data onboard as well as sends it back to the ground in real time. Just to cover all the bases...
It seems like a fast rocket would have the best chance of a straight vertical flight. I would think that the fins stabilizing effect would diminish as the rocket ascends since the air is getting thinner as you go up. So a fast rocket with its greater momentum would hopefully stay on course better than a slower rocket.
But normal GPSes don't work if you go too fast. What's the solution?