Is it possible to get full GPS information at "high" frequency from the build in GPS of the modem?

gauteh / sfy

🌊 A lightweight wave buoy for near-shore deployments.

MIT License

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Is it possible to get full GPS information at "high" frequency from the build in GPS of the modem? #29

Closed jerabaul29 closed 4 months ago

jerabaul29 commented 2 years ago

From our discussion of today; would be possibly useful for generating test data for designing / testing custom 6dof + GPS Kalman filters:

is it possible to get lat, lon, timestamp, velocity, heading, quality indications from the GPS (are there even more quantities we may be interesed in?)
at as high frequency as possible; what kind of frequency is possible with the GPS on the modem? 1hz, 2.5hz, 5hz, 10hz, 25hz, 50hz are common values

gauteh commented 2 years ago

https://discuss.blues.io/t/getting-more-gps-fields-velocity-sensitivity-and-sample-rate/666

Waiting to see if we can get this from the modem, or if we need a separate GPS.

gauteh commented 2 years ago

Velocity and sensitivity is available

jerabaul29 commented 2 years ago

yippi :) .

jerabaul29 commented 2 years ago

We should try to get the GPS datasheet (exact GPS chip?) to be able to check specs.

May want to use for "true real value" a GPS RTK "in addition" if possible, if close to the coast, and RTK signal is available, accuracy is around 1cm.

jerabaul29 commented 2 years ago

(with RTK 1cm is absolute accuracy, wonder if relative accuracy may be even higher (since normal gps has typically 2.5-5m absolute accuracy, but relative accuracy may already there be much better).

jerabaul29 commented 2 years ago

Another way to test against ground truth is to use a wheel like Jim et co, but dataset of field data would still be useful anyways:)