NEO-M8U dead reckoning on a train - how to calibrate

GPS/GNSS Development Boards
1

I would like to use NEO-M8U for tracking positioning on a train - especially in tunnels and other poor GPS signal areas.

I read that the NEO-M8U needs to be calibrated for each vehicle it is used in. Could the NEO-M8U be calibrated for/on a train?

2

Hi,

Unfortunately the calibration procedure is for vehicles (cars and scooters). I think it is unlikely to work on a train. There is some relevant information in this post: viewtopic.php?p=243109#p243109

Best wishes,

Paul

3

Paul, Thank you. I read through the topic on the link and followed it on thru to the ublox forum. As you suggested, it will not work on a train. It has been tried and was unsucessful.

4

Support for wrist, bike, scooter, etc is not entirely consistent across product lines. The dynamics do infer velocity/acceleration expectations both of the GNSS and IMU

Doing the type of motion good for cars (figure 8, sharp turns) are not really reproducible on a train carriage. Wheel ticks should be something the railroad could acquire, but doesn’t help the casual user.

Having ones own IMU and algorithm / filtering would seem like the most robust approach. Available center-line track data would also be very helpful.