Ah, ok.
Twice is just way too much.
Never mind this.
So how is Woo measuring height?
Woo is IMU (inertia motion unit) which uses electric sensors to measure jump. 3 axis Gyroscope to detect rotation and 3 axis accelerometer to detect acceleration on different axis. Also clock is used (hangtime clock).
Except for all those submarines out there that have been using inertial navigation for about 70 years...
I just linked a basic video to show drift.joriws wrote: ↑Tue Jan 08, 2019 1:37 pmSwimmer, I wonder why your linked video does not use Madgwick AHRS filter or does it? This video shows better results in terms of drift compared to your linked video?
https://www.youtube.com/watch?v=6ijArKE8vKU
Except subs don't just use accelerometer data and double integrate it to find positionMossy 757 wrote: ↑Tue Jan 08, 2019 2:31 pmExcept for all those submarines out there that have been using inertial navigation for about 70 years...
Kiteboards and submarines aren't the same, but inertial navigation is one of the core backbones of tactical military navigation systems that buttress GPS during periods of interrupted service.
it's not all doom and gloom as you presented:swimmer wrote: ↑Tue Jan 08, 2019 3:14 pm
I just linked a basic video to show drift.
Yes you can absolutely do some sort of filtering (Kalman filtering) to reduce drift but you have to know the approximate profile of the motion or use another sensor (sensor fusion) to essentially do a weighted average for a better estimate.
3D foot tracking may work a little better as each step is under 1sec in most cases, so the amount of drift that can happen with each step small but over many steps you will still accumulate some error. Also the step motion has a somewhat predetermined profile so you can use filtering to get a decent estimate.
Now estimating the profile of a kiteboaring jump that can last greater than 2sec is much more complex!
There is a reason why Woo doesn't state the accuracy of it's devices
I don't doubt that people have jumped 25m or more especially in capetown conditions it's just Woo numbers are a bit meaningless.
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