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Using LR1110 with a GPS simulator

Semtech Transceivers LR1110/LoRa Edge
#1

I have an LR1110 development kit. It works very nicely in GNSS mode (not Wifi mode) with a good view of the sky.

I would like to use it with a GPS simulator instead of the real GPS satellites, but I’ve found that it doesn’t return a location even when the simulator is properly locked to GPS time, and the simulated positions of the satellites match the positions of the real satellites. I get an error from the solver saying:

Error from solver: errors: [‘GNSS solver error {2}: Location fix dropped due to poor accuracy, caused most likely by big timestamp error’], warnings: []

Can anyone suggest why it isn’t working and what I can do about it?

Thank you for your help.

#2

Can you please share the output of the GNSS scan when you’re using the GPS simulator?

#3

Yes, what would you like to see?

#4

The results of this scan - you can normally get it from the serial interface when using the host application.

#5

Dear,

Could you also please ensure that your simulator is using real ephemeris data ?

#6

@mantoine I am using the Semtech LR1110 Development Kit and the example code LR1110demo.

I see from lr1110demo --help that there is a verbose version you can run by calling -v. Is it the output of the verbose version you would like to see?

Thanks again.

#7

@aal7 - yes, this would be great to get this output.