SIM7070G unable to find a GNSS fix

[sw-dev-code]

I have a SIM7070G module with which I’m trying to get a GNSS fix but without success. Below you can see my sequence of AT commands and responses.

AT+CGNSPWR=1
OK

AT+CGNSINF
+CGNSINF: 1,,,44.060004,20.920002,-37.592,,,1,,0.1,0.1,0.1,,,,155976.0,6000.0
OK

AT+CGNSINF
+CGNSINF: 1,,,44.060004,20.920002,-37.592,,,1,,0.1,0.1,0.1,,,,155976.0,6000.0
OK

AT+CGNSINF
+CGNSINF: 1,,,44.060004,20.920002,-37.592,,,1,,0.1,0.1,0.1,,,,155976.0,6000.0
OK

AT+CGNSINF
+CGNSINF: 1,,,44.060004,20.920002,-37.592,,,1,,0.1,0.1,0.1,,,,155976.0,6000.0
OK

…

I keep getting the same response with always the same latitude and longitude which aren’t correct. Can you tell me what can be wrong?

Thank you in advance.

[LilyGO]

Hello，What is your correct latitude and longitude ? Is it very different from the latitude and longitude you ge t?

[sw-dev-code]

It's very different, my real location is about 150 km away from the reported one. And other parameters are also very strange, like timestamp and number of satellites.

[LilyGO]

Judging by the results of your GPS. Time has not been obtained, the information obtained is not complete. You need to keep positioning. Did you get a location outside? Sometimes it's affected by the weather. Slow positioning .

[sw-dev-code]

I'm testing it outside with a clear weather and open sky. Still getting the same results.

Below you can see a picture of my setup.

[LilyGO]

You may have fewer satellites in your area. You need to stay outside and wait a little longer .

AT+CGNSINF +CGNSINF: 1,,,44.060004,20.920002,-37.592,,,1,,0.1,0.1,0.1,,,,155976.0,6000.0 OK

The results show that there is data, but it is not complete.

[Mr-HaleYa]

You need to go outside where there are few trees. A roof works really well, try it there. Also, it can take up to 5 min to get the first location. Do that then report your results.

[xyzzy42]

It should work inside just fine if near a window. Avoiding trees or being a on a roof is not necessary.

@sw-dev-code, your problem may be that the SIM7070G GPS antenna power is on a different GPIO that the documentation states, as it only covers SIM7000G.

Try this command:

AT+SGPIO=0,5,1,1

Then you should be able measure ~3V on the pad of the GPS connector and top pad of the capacitor directly below it.

[OrnellaBenzi]

i'm having a similar problem, when using AT+CGNSINF i get inaccurate and incomplete data. And when using AT+SGNSCMD I keep getting +SGNSERR: 10 after a minute or two: