GPS CN0 Test

[Bruce Chen]

If you have tested the nRF9151's GPS with the CMW100 or IQ station. We need to know:
1. What test waveform file is required?
2. Should we use the ARB file or the CW waveform?

[Syed Maysum Abbas Zaidi]

Hi,

For full GNSS signaling CN0 test, you may use a GNSS ARB signal from a signal generator (conducted GNSS signaling mode, typically around -135 dBm), and read CN0 from the GNSS logs / UART traces as described in the documentation. And as in this case you requires a GNSS‑modulated signal, the testing should be done using an ARB GNSS waveform or a GNSS simulator rather than a CW tone.

Best Regards,
Syed Maysum

[Bruce Chen]

Hi,

Any recommended ARB files for GPS testing with the CMW100/CMW500?

[Syed Maysum Abbas Zaidi]

Hi,

We are checking internally if there are any recommended reference ARB files for GPS testing and will get back to you shortly. Thank you for your patience.

Best Regards,
Syed Maysum

[Syed Maysum Abbas Zaidi]

Hi,

R&S CMW systems typically include GNSS ARB files such as GPS_single.wv or GPS_default.wv, which are usually available under the CMW waveform directory (...\Rohde-Schwarz\CMW\Data\waveform\, depending on the device model and installation). These can be used for this purpose.

Best Regards,
Syed Maysum

[Bruce Chen]

Hi,

I previously tried using the GPS_single.wv or GPS_default.wv waveform files on the CMW100 or CMW500 for conducted GPS L1 testing, but the CN0 values kept fluctuating, jumping between the original 40 and 0.