Set command

GNSS L1 frequency is 1575.42 MHz. This test expects the Carrier Wave (CW) in the signal generator to be 1575.750 MHz, which means that the offset is 330 kHz. The measurement duration is 1 ms.

Syntax:

%XRFTEST=<test>,<operation>,<param0>,<param1>,<param2>

The set command parameters and their defined values are the following:

<test>

2 – GNSS SNR

<operation>

1 – ON

Note: OFF <operation> is not needed due to automatic stop.

<param0>

RX signal power at the System in Package (SiP) GNSS port

Valid range from −127 dBm to −25 dBm or 0 = default gain −105 dBm

<param1> v1.2.x pti_v1.1.x≥1

AFC correction

1 – Enable AFC correction in measurement

0 – Disable AFC correction in measurement

<param2> v1.2.x pti_v1.1.x≥1

Frequency. Manually give RF frequency for nRF9160 in 100 kHz format. Accepted value is +/- 10 MHz from the default GNSS frequency of 1575.42 MHz. Set the signal generator to f = <param2> + 330 kHz.

Note: If <param2> is not given, nRF9160 uses the default GNSS L1 frequency 1575.42 MHz.

Response syntax:

%XRFTEST: <snr>,<antenna_power>

The response parameters and their defined values are the following:

<snr>

The result of the SNR measurement in q4 dB. q4 means that dividing the result by 2⁴ = 16 gives dB.

<antenna_power>

Measured signal power at the SiP GNSS port in q8 dBm. q8 means that dividing the result by 2⁸ = 256 gives dBm.

The following command example executes a GNSS SNR test at –80 dBm level with AFC disabled:

AT%XRFTEST=2,1,-80,0
%XRFTEST: 364,-20506
OK

The following command example executes an GNSS SNR test for –80 dBm. AFC correction is enabled and uses the result of the previous AFC measurement or AFC set. Instead of the default, the receiver frequency is set to 1575.0 MHz:

AT%XRFTEST=2,1,-80,1,15750
%XRFTEST: 364,-20506
OK