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remove imu, only uwb, tdoa position

Posted: Wed Mar 21, 2018 10:42 am
by justinleeyang
hi, arnaud:

if disable imu, only uwb, can we get the right and stable position ?

Re: remove imu, only uwb, tdoa position

Posted: Mon Mar 26, 2018 10:49 am
by arnaud
Maybe, it depends of what is your expectation of 'stable'. In theory the absolute position quality should be the same, but the dynamic performance should be worse since the IMU is used for short-term movement.

If you test I am interested to hear about the result ;-).

Re: remove imu, only uwb, tdoa position

Posted: Wed Apr 04, 2018 3:11 am
by justinleeyang
hi,

ok, I will try, and can 4 anchors get the tag's 2D position, no need z axis ?

Re: remove imu, only uwb, tdoa position

Posted: Wed Apr 04, 2018 8:59 am
by arnaud
This can be done by feeding a fixed (roughly accurate) Z position input to the kalman filter. For an example of how to feed Z position you can look at the z-ranger deck driver.

Re: remove imu, only uwb, tdoa position

Posted: Wed Apr 04, 2018 12:04 pm
by justinleeyang
with hyperbolic method, I have geted the tag's position, thanks.
and I also try your method