Strange behavior during position acquisition

[Tron]

We are testing  GPS capabilities for our hardware, using mfw 1.1.0 in the field. We have the following test conditions

• The unit is ackquiring position every 5 min
• the unit is outdoors, in an open field in a rural area
• the operating temperature is around 0 (measured by a temp sensor on the pcb)
• The unit had a battery change

We see the following: 

• After battery change, the unit did not send position on 73 tries, 
• After a restart, the unit started to send positions with almost 0 ackquisition time, and it sent 15 positions with hot fix
• It then seemed to loose the hot-fix capability, and after that, the hot fix capability seems to go on and off with an interval of around 15-20 acquisitions.  
• This periodic behavior seems to be present also prior to the battery change, but the data is not analyzed that thoroughly. 

Yours, 

Tron

[Martin Lesund]

Hi Tron,

This sounds interesting and needs to be investigated.

Could you possibly take some modem traces when this issue occurs so we could see what the cause maybe?

Best regards,

Martin L.

[Tron]

Hi martin

This is on my bucket list, but unfortunately it's a bit down. I will come back to you when this is done.