Real-time authentication of ublox GNSS data using OSNMA and python
For MSc thesis GNSS Safety and Handling
Tested with Ublox ZED-F9P
Will write the following configurations to RAM
• 42, CFG-NMEA-PROTVER • 1, CFG-ITFM-ENABLE • 2, CFG-ITFM-ANTSETTING • 1, CFG-MSGOUT-NMEA ID GBS USB • 1, CFG-MSGOUT-UBX MON RF USB • 1, CFG-MSGOUT-UBX NAV CLOCK USB • 1, CFG-MSGOUT-UBX NAV PVT USB • 1, CFG-MSGOUT-UBX NAV SIG USB • 1, CFG-MSGOUT-UBX NAV TIMEGAL USB • 1, CFG-MSGOUT-UBX NAV STATUS USB • 1, CFG-MSGOUT-UBX RXM RAWX USB • 1, CFG-MSGOUT-UBX RXM SFRBX USB • 0, CFG-SIGNAL-GLO ENA • 0, CFG-SIGNAL-QZSS ENA • 0, CFG-SIGNAL-BDS ENA
Monitors following messages:
['<NMEA(GAGSV', '<NMEA(GNGBS', ['<NMEA(GNGGA','<NMEA(GAGGA','<NMEA(GPGGA'],
'<NMEA(GNGLL', '<NMEA(GNVTG', '<NMEA(GPGSV',
'<UBX(MON-RF', '<UBX(MON-SPAN', '<UBX(NAV-CLOCK',
'<UBX(NAV-PVT', '<UBX(NAV-SIG', '<UBX(NAV-TIMEGAL',
'<UBX(RXM-RAWX', '<UBX(NAV-STATUS', '<UBX(RXM-SFRBX']
Load from CSV file or record live data, Log to CSV file
Able to plot and monitor
Automatic Gain Control (AGC) from - MON-RF (Average) Carrier to noise (CNO) from - RXM-RAWX Pseudorange and doppler measurement consistency from - RXM-RAWX RAIM status from - NMEA-Standard-GBS Position and velocity consistency from - NAV-PVT Time from: rcvToW from RXM-RAWX; galTow (Gallileo) and iTOW (gps) from UBX-NAV-TIMEGAL; iTOW, other estimates from NAV-CLOCK
Spectral diagram of U-blox Spetrum analyzer
Satellite Measurements (RXM - RAWX)
SFRBX DATA - OSNMA
- Convert page bits according to Galileo ICD
- Split pages by satellite PRN
- Filter satellite which are actively transmitting OSNMA
- Locate and store DSM-KROOT and TESLA root key, digital signatures
- Assemble hash message and authenticate using ECDSA
- Authenticate chain root key
- Authenticate navigation tags
- Read Galileo data words
Test OSNMA performance
TTFAF benchmarks
Time Mangement with NTP request
