GSP seems not working

[TigerD]

Hi,

I compiled and downloaded GPS sample, I got the following messages:

    Tracking: 0 Using : 0 Unhealthy : 0

Seconds since last fix: 600

Scanning [ _ ]

Over 10 minutes, it has not received any GPS data. Did I miss some thing?

The gps project running on nRF9160 Development Board.

Thank you,

David

[Carl Richard]

Hi, David!

Which version of the DK are you using? GPS is only supported for 0.8.5 and above. 

Note that you will achieve best performance for the GPS outside(no roof), on a flat surface. 

Hope this helps!

-- Carl Richard

[TigerD]

Hi Carl,

The dev board 0.8.3.

But the gps messages are read with asset tracking example.

But the GPS position doesn't reflect the true position. The position read from the modem as

6325.330N, 01026.200E

Is the location as Nordic Semiconductor Header Quarter?

Thank you,

David

[TigerD]

Hi Carl,

I want to confirm with you that the modem version 1.0.1 doesn't support concurrency of LTE and GPS.

It is not efficient and error-prone to the system without concurrency. If this is true, not supported on the current version of modem, do you have any target plan that it will be supported in the near future?

Thank you,

David

[Carl Richard]

Hello again, David!

TigerD said:

The dev board 0.8.3.

As mentioned you must have DK 0.8.5 or higher for on board GPS support. I recommend that you get hold of an external antenna, as described here. 

TigerD said:

Is the location as Nordic Semiconductor Header Quarter?

That's right. The asset tracker example on the V1.0.0 tag uses spoofed GPS data. 

------

TigerD said:

I want to confirm with you that the modem version 1.0.1 doesn't support concurrency of LTE and GPS.

The modem version 1.0.1 does support concurrent use of GPS and LTE, given that the modem is running in PSM(Power Saving Mode). Concurrency using eDRX will also be possible in the future I believe. 

Hope this helps! 

[TigerD]

Hi Carl,

Thank you for your prompt reply.

One more question: I found there is similar dev board with LTE-NB/GPS functionality:

Nordic Semiconductor Thingy:91 Multisensor Prototyping Kit

Compare to nRF9160-DK: both support LTE-NB/GPS. Which is a better board (nRF9160-DK or Thingy 91)? For Thingy 91: which revision supports GPS and LTE?

Last time, we got DK, but not 0.8.5 revision of DK. I want to make sure that we are getting the right board.

Thank you,

David

 

[Carl Richard]

My pleasure, David!

I cannot give a definitive answer on which board is better, as that depends on application and other factors.

The nRF9160 DK is a classic development kit, with lot's of I/O for your use, several buttons and switches for user input, and several leds user feed back. In other words it's a good platform for testing the capabilities of the nRF9160. Furthermore it is easily programmable(as there is a programmer on board), and you have easy access to the BLE capabilities of the on board nRF52840 as well. But, except for the GPS, it lacks any sensors. So you either have to "fake" some data, or connect and interface with external sensors yourself. Furthermore it's quite bulky, and does require some kind of external power. 

The Thingy:91 is as you say a multisensor prototyping kit, so it gives you great possibilities for testing with real data(also GPS) while also being quite portable and handy. It has one button and a RGB led as UI, but it  still lacks some of the versatility of the DK as you have less I/O, while also being a bit more of a hassle when it comes to programming it(though there are good guides on doing this).

So to be clear, all revisions of Thingy:91 supports GPS out to the box to my knowledge. The same is true for revisions of the DK including 0.8.5 and up. But I would still recommend getting hold of an external antenna as both boards as of now don't have fantastic GPS performance regardless of revision.

If you want to make sure that you get the right revision of the DK I suggest that you contact your supplier or Nordic staff to make sure that they give you the right one. 

All the best

Carl Richard