High Cold Start Time for GNSS on nRF9151 DK in India

[Dhanesh Baheti]

I am working on a wearable GPS tracking device using the nRF9151 DK and testing the GNSS example code. However, I am facing an issue with the cold start time for acquiring the coordinates. It is taking about 7–8 minutes, which seems quite high.

I am using the onboard embedded antenna and testing the system in Delhi. Is this cold start time normal for the nRF9151 DK? Are there any specific configurations or optimizations I can implement to reduce the cold start time, especially in urban environments?

Any insights or suggestions would be greatly appreciated!

Thanks in advance.

[Ares123]

Hi,
I am trying to work on the GNSS functionality in India as well.
But I am not able to get a fix even after several minutes and an open environment.

I flashed the SLM firmware in the nRF9151 DK board and ran the following series of AT commands:
AT%XSYSTEMMODE=0,0,1,0 //enabling only GNSS
AT+CFUN=31 //airplane mode but GNSS present
AT#XGPS=1,0,0,0 //timeout indefinite

after this I am receiving the output:
#XGPS: 1,1 

But not getting a location fix after this, no further output

Please suggest what you did to get a GNSS fix.

[dejans]

Hi Ares123 ,

You can try to enable CONFIG_SLM_LOG_LEVEL_DBG Kconfig option for getting more information when fix cannot be obtained. As this issue seems to be different from originally posted one, I suggest that you open new ticket and provide your application log there.

Best regards,
Dejan