Example of a hardware connection diagram for over-the-cable testing:
- External GNSS antenna with an embedded preamplifier
- SDR EtttusResearch B2x0 with installed GPSDO module
https://www.ettus.com/product-categories/usrp-bus-series/
https://www.ettus.com/all-products/gpsdo-tcxo-module/ - Reference GNSS receiver UBLOX M8T
https://www.u-blox.com/en/product/evk-8evk-m8 - GP-Divider - GNSS splitters for sharing one antenna between receivers
- RF directional coupler to mix the fake signal with the real one.
Do NOT use an RF power divider instead of a coupler to avoid self-spoofing of the reference receiver and GPSDO.
https://www.pasternack.com/directional-20-db-sma-coupler-1-2-ghz-50-watts-pe2201-20-p.aspx - Attenuators and adapters
- Device under test
- SDR USB 3.0 and UBLOX USB connection
Minimum hardware set to launch GP-Simulator
To run the application minimally you need to have the following devices:
- SDR EtttusResearch B2x0 with installed GPSDO module connected to a computer via USB 3.0
- Reference GNSS receiver UBLOX M8T connected to a computer via USB
- One GNSS antenna + GNSS splitter OR two GNSS antennas
to connect to USRP SDR and reference UBLOX receiver