Using A-GNSS to improve TTFF

[carl239955]

Hello 

I am interested at looking at the Teseoo-LIV3F for a application but I require a very fast TTFF. Having read up on the A-GNSS option will this be available any where or any location in the world as long as the server is accessible ?

So no matter where you are as long as you can access the A-GNSS server the TTFF speed should improve considerably from up to 35s for COLD START to a few seconds after accessing and relaying the relevant data / information ?. The ephemeris data obtained from the server will be valid for your location and your sky ?

thanks

cab

[Francesco Virlinzi]

Hi 

with LIV3F supports you have the autonomous AGNSS (which doesn't need any extra data)... the modules will learn the satellites orbit and it will use the prediction to provide a fast TTFF.

The Real-Time AGNSS is based on data coming on the internet server and it's for free on LIV3F. From the server you will download all the satellites information for all locations

[carl239955]

Thank you Francesco - is there an App note on this feature ?

[Francesco Virlinzi · Accepted solution]

Hi

On Autonomous AGNSS there is no AN (but it's enabled by default in the module)

On Real-Time AGNSS you can have a look at:

https://www.st.com/resource/en/application_presentation/teseo-3-quick-testing-guide.pdf

https://www.st.com/resource/en/application_note/an5160-rxnetworks-assisted-gnss-server-interface-specification-stmicroelectronics.pdf

Regards

 Francesco