Thingy91 GPS questions

[anderkee]

Hi!

We are developing a tracker based on Thingy91 using GPS and LTE.
We're using the latest Modem firmware 1.2 and Zephyr/NCS v1.2.0

The GPS cold start until receiving a FIX is rather long, our test measurements in open air is approx 67 seconds until we reach a GPS FIX (the nRF9160 GPS specification states as low as 36 seconds cold start)
How is the progress regarding improvements of the GPS driver?

Our use case is to have GPS positions preferable every 5 seconds.

Questions:

• We're using the GPS driver, is there anything that we could do to speedup the cold start GPS FIX?
  I saw on

• When both GPS and LTE is activated how long is the duration switching back and forth from LTE to GPS?

Best regards
Kenneth

[Brian Kim]

Hello Kenneth,

Please find below comment per each questions.

-. Assisted GPS would be a good option. I recommend you to test it under NCS v1.3.0 or master branch which has cloud assisted GPS for asset tracker application.

-. The switching time depends on allowed PSM and eDRX interval. if 5 second is preferred, you can set it eDRX internal properly.

//Brian