GPS SNR testing

The command executes an GPS SNR test.

GPS L1 frequency is 1575.42 MHz and this test expects the CW in signal generator to be 1575.750 MHz, i.e. 330 kHz offset. The measurement duration is 1 ms.

The command parameter and its value are the following:

<test>
2 – GPS SNR

GPS SNR

<operation>
1 – ON
Note: Automatic stop, i.e. no "OFF" needed.

GPS SNR ON has one parameter:

<param0>
RX signal power at antenna [dBm]
Valid range from −128 to −25 or 0 = default gain −105 dBm.

Response syntax when <operation> is ON:

%XRFTEST: <snr>

The response value is the following:

<snr>
Result of the SNR measurement in q4 dB. q4 means that dividing the result by 24 = 16 gives dB.

The example command executes an GPS SNR test:

%XRFTEST=2,1,0
%XRFTEST: 514
OK
Note: 514/16 = 32.125 dB