shockie
High Plains Rocketeer
What determines the sampling rate of an altimeter?. For example, the Raven 4 states it has a 400 Hz accelerometer. Does that mean it samples 400 times a second? ELI5.
Yes. That’s is exactly what it means. You will get all 3 axes sampled 400 times per second.
Lots of things can determine the sampling rate: processor speed, processor load, sensor limits, noise, etc. Usually there is some sort of trade off happening, i.e. lower sample rate to reduce noise.
Does higher sample rates equate to higher resolution.
For example, compare and contrast 400 vs 50 for a short time frame say 0.3 seconds
ok Russ you are going to have to show me the math on how you got 120 and 15 from 400 aND 50...eli5Temporal resolution yes, you would get 120 measurements vs 15 respectively. Depending on the sensor, this may give you a lower pressure resolution though. That is the balance, really you want a useful altitude, not just pressure points.
0.3 second * 400 samples/second = ?ok Russ you are going to have to show me the math on how you got 120 and 15 from 400 aND 50...eli5
Hmm, looking at the Featherweight website:Yes. That’s is exactly what it means. You will get all 3 axes sampled 400 times per second.
Lots of things can determine the sampling rate: processor speed, processor load, sensor limits, noise, etc. Usually there is some sort of trade off happening, i.e. lower sample rate to reduce noise.
Will changing the baro sample rate from 20 to 200 give me a more accurate altitude reading?
Not to nitpick, but you took my question out of context. It was purely rhetorical, I wasn't looking for an answer, I was framing it from the perspective of the OP. You'll notice I answered my own question to try and provide prospective on sample rates to the OP.No. That’s not how barometric pressure sensors work. Increased sample rate won’t necessarily increase your accuracy, but it sure will increase the noise. At least in my experience.
Additionally, you will definitely see the shockwave in the data at 20Hz. In fact, you will probably see a difference through the entire supersonic flight region, but it might depend.
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