Global Navigation Satellite System (GNSS) testing is essential on the product level since the GNSS RF front-end design, including Low-Noise Amplifier (LNA) and filtering, is the integrator's responsibility.
The following table shows recommended test cases for conducted GNSS signaling mode. The expected results include the contribution of external GNSS LNA.
| Mode | Test item | Test spec./ ID | Band/ Channel | Temp/ Voltage | Signaling parameters | Expected result | Note |
|---|---|---|---|---|---|---|---|
| GNSS RX | GNSS sensitivity / CN0 (SNR) | NA | GNSS | TYP/TYP | GNSS in receive mode GNSS signal level −135 dBm |
CN0>34 dB1 | ARB signal generator can be used for GNSS signal. The GNSS CN0 data can be recorded from Universal Asynchronous Receiver/Transmitter (UART) trace information. For details on CN0 data tracing, see nRF Connect SDK code examples. |
| Adjacent frequency band selectivity | ETSI EN 303 413 v1.1.1 | GNSS in receive mode GNSS signal level −128.5 dBm 1 satellite min |
CN0 degradation <1 dB (vs. without blocker) | Requires GNSS and blocker signal (AWGN) generators. | |||
| Spurious emissions | GNSS in receive mode | Below emissions limit | Limit: 30 MHz…1 GHz: –57 dBm/100 kHz 1 GHz…8.3 GHz: –47 dBm/1 MHz |
Receiver blocking tests verify the GNSS filtering's compliance against GNSS blocking requirements in ETSI EN 303 413 V1.1.1.
1 Assuming that an external LNA is used. The external LNA's Noise Factor (NF) is less than 2 dB, and minimum gain is 15 dB.