GPS Sample code works, but how do you reduce power?

[stevenminnick]

I got this project to compile and work: https://github.com/NordicPlayground/fw-nrfconnect-nrf/tree/master/samples/nrf9160/gps

I have the latest radio firmware at this time: 0.7.0_29.  I'm actually using a DK 0.8.2 which required an external antenna, but when I use one it works fine.

I measure constant current around 30mA when doing this. 

According to this, there seems to be 2 lower power modes below what this sample is using: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf9160%2F_tmp%2Falta.nRF9160%2Fautodita%2FCURRENT%2Fparameters.id_current_gps.html&resultof=%22%67%70%73%22%20%22%67%70%22%20

Also some information on lower power modes here: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf9160%2Fgps.html&resultof=%22%67%70%73%22%20%22%67%70%22%20

Is there any guidance on getting the radio into these lower power modes?  Are these modes implemented in the radio firmware at this time?

[Martin Lesund]

Hi Steven, 

The new modem firmware supports GPS in PSM mode.
Here is an example code on how you can use it.

From the v1.0.0 release notes:

• GPS L1 C/A receiver during LTE PSM mode

• • Single shot, fixed interval and continuous tracking modes 

[stevenminnick]

Thanks for the link with the example code.  I'm still trying to get the IDE to actually open his project without errors.  There is a lot of GPS stuff in there, but lack of documentation and failing to open is causing me some issue trying to actually compile and run that code.