Toby wrote: ↑
Sat Jan 05, 2019 10:12 pm
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).
First unit rotates coordinate axis to earth and calculates accelerations by earth coordinates. Sensor can be oriented any direction like board inverted. It still calculates direction to center of earth. Then it evaluates on that axis forces up and down to get acceleration component for height. (Unit also does other signal processing like filtering sensor inputs etc)
Unit integrates over time the acceleration to get speed. Speed is integrated again over time to get position. Position is the woo-meter height.
Like basic physics formula
y = y0 + vy*t + 0.5*ay*t*t
but here the sensor signal is constantly changing every 0.001s (if 1000hz sampling). But actual formula is double integrated over time to get area of acceleration to get the speed and then area of speed to get distance (height).
This is why the hangtime must be correct because it is evaluated on speed and then on position calculation. And checking the hangtime from video against leaderboard is the minimum requirement.