nRF9160 GPS configurations and fixing issues

RE: nRF9160 GPS configurations and fixing issues

xuan0802 — Sat, 06 Jun 2020 17:21:01 GMT

I got the same problem, I run sample GPS alone, I can get a fix in a short time. But when combining with LTE, it can not get fix even a lot of satellites are being tracked. We prototype several circuit using nrf9160, but no circuit is running :(.

RE: nRF9160 GPS configurations and fixing issues

Hakon — Wed, 20 May 2020 12:44:36 GMT

[quote user="Grigor"]Do you have any estimation when the NCS official release will be? [/quote]

End of Q2 2020.

RE: nRF9160 GPS configurations and fixing issues

Grigor — Mon, 18 May 2020 14:48:28 GMT

[quote userid="73166" url="~/f/nordic-q-a/61326/nrf9160-gps-configurations-and-fixing-issues/250483"]For better GPS performance, you should consider using A-GPS. You can try the nrf_cloud_agps sample project and see if it helps. Also if you haven't done it, you should upgrade the modem firmware to the latest release.[/quote]

We have just upgraded the modem firmware to the latest one. Actually we tried to use AGPS available in your development branch, but it seems it's not an official release version, right?. Do you have any estimation when the NCS official release will be?

RE: nRF9160 GPS configurations and fixing issues

Grigor — Mon, 18 May 2020 14:42:29 GMT

[quote userid="73166" url="~/f/nordic-q-a/61326/nrf9160-gps-configurations-and-fixing-issues/250483"]You should follow the guidelines in this document. It is recommended that you use a separate antenna for GPS and LTE.[/quote]

Yes, we are using 2 different antennas for GPS and LTE.

RE: nRF9160 GPS configurations and fixing issues

Grigor — Mon, 18 May 2020 14:36:21 GMT

[quote userid="73166" url="~/f/nordic-q-a/61326/nrf9160-gps-configurations-and-fixing-issues/250483"]The link is working perfectly fine, at least in my browser(Firefox).[/quote]

Something is strange with this link. I'm also using Firefox and it's not opening. I tried to open in another PC with Chrome not opened. Tried to open in another PC with both firefox and chrome, the same result not opening. I tried to connect to another network to change my IP, also no result. But the same link opened in my phone without any problem:) Will try to clarify the issue in my side.

RE: nRF9160 GPS configurations and fixing issues

Hakon — Mon, 18 May 2020 14:25:59 GMT

[quote user="Grigor"]Actually the link that you've provided is not working, it can't open.[/quote]

The link is working perfectly fine, at least in my browser(Firefox).

[quote user="Grigor"]Is it possible to change the mode of GPS operation through AT commands?[/quote]

Not that I'm aware of.

[quote user="Grigor"]As for antenna I mean these note from the datasheet[/quote]

You should follow the guidelines in this document. It is recommended that you use a separate antenna for GPS and LTE.

[quote user="Grigor"]Currently I'm facing one more issue. When LTE mode is in PSM I'm trying to fix GPS coordinates, but even keeping in this mode more than 2 hours I'm not getting any fix.[/quote]

For better GPS performance, you should consider using A-GPS. You can try the nrf_cloud_agps sample project and see if it helps. Also if you haven't done it, you should upgrade the modem firmware to the latest release.

RE: nRF9160 GPS configurations and fixing issues

Grigor — Fri, 15 May 2020 15:03:35 GMT

Hi Hakon. Thanks a lot for your reply.

[quote userid="73166" url="~/f/nordic-q-a/61326/nrf9160-gps-configurations-and-fixing-issues/250230"] You can find information about the gps modes here. There is no "default" mode as far as I understand though. The modes can be set in nrf_setsockopt().[/quote]

Actually the link that you've provided is not working, it can't open.

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrfxlib/bsdlib/doc/api.html#gnss-socket

Is it possible to change the mode of GPS operation through AT commands?

[quote userid="73166" url="~/f/nordic-q-a/61326/nrf9160-gps-configurations-and-fixing-issues/250230"]Can you clarify what you mean by "configure the antenna type"?[/quote]

As for antenna I mean these note from the datasheet

I have one more question.

Currently I'm facing one more issue. When LTE mode is in PSM I'm trying to fix GPS coordinates, but even keeping in this mode more than 2 hours I'm not getting any fix.

The nRF9160 captures up to 12 satellites but GPS is not fixing. Once I disable LTE it fixed within 6-7 mins.

What is wrong in my operations?

I can send you the AT commands that I'm using to configure the module if required.

Thank you.

RE: nRF9160 GPS configurations and fixing issues

Hakon — Fri, 15 May 2020 14:45:27 GMT

Hey,

[quote user=""]Could you please inform me which mode is default one? How I can change the operation mode an which mode will provide the best performance for GPS fixing?[/quote]

You can find information about the gps modes here. There is no "default" mode as far as I understand though. The modes can be set in nrf_setsockopt().

[quote user=""]Do I need to configure the antenna type that I’m using in my device and if yes, how to do this?[/quote]

Can you clarify what you mean by "configure the antenna type"?