NovAtel GRIT - GNSS Resilience and Integrity Technology
OEM7 firmware suite for GNSS interference, jamming and spoofing detection with spectrum analysis and mitigation
GNSS Resilience and Integrity Technology (GRIT) is Hexagon | NovAtel's firmware suite for its OEM7 generation of GNSS receivers, developed to give operators a comprehensive understanding of their RF environment and to answer the question every airport, ANSP and timing operator now faces: is my GNSS under attack, and from what? GRIT combines two toolkits. The Interference Toolkit (ITK) continuously measures RF spectrum levels around the GNSS bands, using spectral analysis to detect in-band, near-band and strong out-of-band interference, plus a complementary statistical detector for out-of-band interference that distorts signals beyond the analog passband. When a threat is identified, software-applied signal processing and digital filters built into every OEM7 board - HDR mode, notch filters and bandpass filters - can mitigate the interference so GNSS signals keep tracking and the receiver continues to operate normally.
The Spoofing Detection Toolkit (SK) runs a selection of single-antenna detection metrics across multiple frequencies and constellations onboard the receiver; at the Norwegian JammerTest 2023, NovAtel's publicly published results show the SK unit monitoring GPS L1/L5, Galileo E1/E5a/E5b and BeiDou B1C/B2a observations at a 0.5 Hz detection rate with a spoofing decision every two seconds, detecting the event's complex jamming and spoofing scenarios. Galileo OSNMA navigation message authentication adds a cryptographic protection layer. For deeper analysis, GRIT can capture time-tagged snapshots of analog-to-digital samples to characterise jamming signals or feed user-developed interference-location algorithms.
The free GRIT Monitor application (part of NovAtel Application Suite) presents everything in a single dashboard: a Mitigation Assistant, interactive spectrum and waterfall viewers across all GNSS bands, a per-constellation Signal Matrix, and a map-based Position Overview with interference points of interest and event history. Critically for Gulf procurement, GRIT is a non-controlled, firmware-only product - no specific export licensing is required - and it runs on receivers from the compact OEM719 board to the PwrPak7 enclosure, making it straightforward to deploy detection-grade GNSS monitoring at airports, GBAS sites and timing-critical infrastructure.
Technical specifications.
| Platform | runs on NovAtel OEM7 receiver family - OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2 |
| Components | Interference Toolkit (ITK) + Spoofing Detection Toolkit (SK), surfaced in the GRIT Monitor app of NovAtel Application Suite |
| Interference detection | spectral-analysis detection of in-band, near-band and strong out-of-band interference, plus statistical-analysis detection of out-of-band interference distorting the analog passband |
| Spectrum monitoring | RF power spectral density across all GNSS bands with interactive spectrum and waterfall views (ITSPECTRALANALYSIS / ITPSDFINAL) |
| Spoofing detection | single-antenna, multi-frequency multi-constellation detection metrics; at JammerTest 2023 the SK unit monitored GPS L1/L5, Galileo E1/E5a/E5b and BeiDou B1C/B2a at a 0.5 Hz detection rate with a spoofing decision every 2 seconds |
| Authentication | Galileo Open Service Navigation Message Authentication (OSNMA) supported as a complementary protection layer |
| Mitigation (activatable options) | HDR mode signal processing, notch filters for narrowband interferers, bandpass filters for band-edge interference, programmable filters (ITBANDPASSCONFIG / ITFRONTENDMODE / ITPROGFILTCONFIG) |
| Jamming characterisation | time-tagged snapshots of analog-to-digital samples for characterising jamming signals and developing user interference-location algorithms |
| GRIT Monitor dashboard | Mitigation Assistant, Spectrum Viewer (spectrum + waterfall), Signal Matrix by constellation and band, Position Overview map with interference points/areas of interest and event history |
| Field validation | jamming and spoofing detection/classification performance published from Norwegian JammerTest 2023 (Bleik, Norway) |
| Receiver interface | ITDETECTCONFIG / ITSPECTRALANALYSIS / ITWARNINGCONFIG commands and ITDETECTSTATUS / ITPSDFINAL / ITFILTTABLE logs |
| Export status | non-controlled, firmware-only solution - no specific export licensing required (per NovAtel) |
Available variants.
Use cases.
- ›Airport and aerodrome GNSS interference monitoring at runways, approach corridors and GBAS sites
- ›Continuous RFI situational awareness for ANSPs and airport operators in jamming-affected regions
- ›Spoofing detection for GNSS timing receivers in ATC, telecom and airport IT infrastructure
- ›Jamming signal characterisation and evidence capture for spectrum-enforcement investigations
- ›Interference-source localisation research using time-tagged ADC sample snapshots
- ›Hardening survey, mapping and UAV ground-reference receivers operating near conflict-adjacent airspace