3 ms·
How is this an improvement over other INS like LRG? INS mechanisms suffer from the same problem: that they only detect linear or rotational acceleration. To re
by errcorrectcode 5y ago
How is this an improvement over other INS like LRG?
INS mechanisms suffer from the same problem: that they only detect linear or rotational acceleration. To reach position, double integration must be performed, which rapidly accumulates error (drift) because velocity and position both have to be maintained to calculate the next position.
Disclaimer: Trimble Nav alum
- rjeli 5y agoeven worse, your (single) integrated gyro estimate must then be fed back into your double integrated accel filter to subtract gravity and further compound errors :)
- errcorrectcode 5y agoRelativistic effects suck. GPS has to consider it when determining a fix too.
- snerbles 5y agoWhile I heard that the effect of double integration is bad, attempting it as a student with consumer MEMS devices was quite dramatic. Really underscores the importance of Kalman filters and updates from sensors with fewer derivatives.
- bitwize 5y agoYou mean like... GPS? I used to work on AUVs with inertial navigation, and a Kalman filter accepting input from GPS at the surface and a DVL or similar underwater, as well as the inertial unit, was pretty much standard equipment. The device in the article has to have miraculously low error in order to eliminate the need for GPS.
- errcorrectcode 5y agoMiraculous vaporware hype until proven otherwise. Something working in a lab is vastly different from manufacturable.
- namibj 5y agoNo, you can measure absolute rotation speed. Yes, via a good ring laser gyro. You just can't measure absolute linear speed.