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Stemming from ten years (1998 to 2008) of close association with the Australian AirService’s GRAS (discontinued) and GBAS (Sydney) projects, the company has performed a broad variety of consultancy, project support and system R&D activities.

Leveraged from this previous work, and after many years of joint research with both ACSER (UNSW) and UniAdelaide, we are please to announce arrival of our GRIFFIN product range for the automatic detection and geo-location of RF Interference signals affecting mission critical GNSS operations.

GRIFFIN an acronym for “Gnss Rf InteFerence FINder, is a family of products specifically designed to quickly detect and geo-located both RF Jamming and/or Spoofing sources quickly and easily. Comprehensive 24/7 RF spectral monitoring (both jamming and spoofing), for protecting regional GNSS frequencies used in high safety / integrity mission critical navigation applications.

Further additions to the GRIFFIN product range and modernised versions to both GBAS GMMR and GVT Emulator products are to be announced Q4 2015. 





threeboxes_title.pngGRIFFIN system consists of several Sensor/ Monitoring Nodes installed within a regional area encompassing the mission critical GNSS infrastructure requiring protection. Typically, several networked Sensor Nodes are evenly installed around the required coverage area, such as, an airport or major communications hub. Controlled from a single command location, the system Central Processing Unit coordinates each Node’s RF spectrum 360deg azimuth scanning searches using the antenna arrays and advanced signal processing techniques. When any RF interference or Spoofing instances are detected, the Central Processing Unit quickly tasks each remote Node to optimise beam forming for the required direction to intercept the target RFI signal(s), then collects and processes spectral data for geo-location function.

Using the combination of AOA data generated by each Node and combined TDOA processing of Node spectral data at the Central Processor location, any RFI source in the GPS L1 frequency band is quickly detected and geo-located to accuracies of a few metres within seconds.  The location and type of interference is quickly and automatically passed to the appropriate authorities to deliver the required remedial action.

Dealing with Jammers, by harnessing the synergies between AOA and TDOA processing, the system is able to both detect and geo-locate a broad variety of RFI signal types with accuracies of a few metres, these being:

  • Narrow and Wide Band Noise sources (e.g. Personal Privacy Devices)
  • Swept/Carrier Wave (CW), Pulsed CW, and, Comb/CHIRP Signals
    • civilianAntennaWithSky.jpg


For detecting Spoofers, malicious PRN signals are typically transmitted from one direction, while the genuine GPS signals arrive from many directions, accordingly;

  • Signal AOA estimates from antenna array can be used to separate spoofers from genuine GPS signals.
  • Genuine GPS satellites continue to be tracked and removed from input data allowing improved TDOA geo-location of multiple spoofer signals.

GRIFFIN 1000 is fully automatic for unattended operation and remote access support. Detailed remote supervisory displays of real-time operational performance and spectral processing are also provided.

For more detailed information:





Automated control interface that bridges the dynamic outputs from any number of popular PC simulation applications, (Xplane, FlightSIM, etc,) to automatically drive Spirent’s simulation SimGEN’s vehicle motion interface. In essence, using RTRemote the GNSS simulator becomes completely slaved to the output of the PC simulation. Any GPS receiver connected to the simulator experiences all the dynamics as commanded by the operator of the PC Simulation through the attached gaming joy stick, thus eliminating the need to prepare time consuming motion files manually within the SimGEN environment.

For more detailed information:

RTRemote Product Information

 GVT Emulator

Aviation GVT EmulatorPrior to permanent GBAS infrastructure installation, many engineering issues associated with proper site selection and signal propagation characteristics need to be thoroughly investigated. Deficiencies in pre-installation testing can lead to expensive project overruns and costly delays. The GVT Emulator is designed for use by aviation authorities as a low cost test solution to assist in GBAS /GRAS pre-installation engineering risk mitigation studies. Employing a survey NovAtel OEM6 Receiver loaded with specialized API firmware, it directly controls a Telerad EM-9009A D8PSK VHF Transmitter (80 watts) and generates in real time either RTCA DO-246C GBAS Type 1, 2, 4 and GRAS 101 messages for any defined D8PSK slot.

Given its simplicity, (uncertified, limited RAIM only integrity, no redundancy), the GVT Emulator delivers aviation test authorities an efficient and easily deployable GBAS /GRAS support tool for generating engineering GBAS VHF test transmissions, in advance of future deployed final DO-278 approved vendor equipment. It supports industry demonstrations, system performance analysis, VHF propagation investigations and verifying aircraft avionics functionality. Also the GVT Emulator can be used as the ground static Reference Station (truth) when post processing aircraft trajectory for 2cm accuracy, (refer NovAtel GrafNAV software). 

For more detailed information:

GVT Emulator Product Information

IMM Receiver

Aviation GMMRFor both pre & post certified GBAS ground system installation, ongoing “user” GNSS signal verification and validation performance monitoring for provides for improved system confidence. The GNSS Multi Modal Receiver (IMMR) is designed as an adaptable low cost Airborne or Ground monitoring solution for continuous reception of VHF GBAS / GRAS signal transmissions. Using industry leading NovAtel OEM6 Receivers loaded with specialized API firmware, IMMR directly controls Telerad RE-9009A D8PSK VHF Receiver, while also differentially processing in real time incoming RTCA DO-246C messages, GBAS Type 1,2,4 and GRAS Type 101.

IMMR can deliver a variety of reception solutions either during aircraft flight surveys, (refer NovAtel GrafNAV 2cm post processing software), OR, in a static ground monitoring roles deliver continuous GBAS / GRAS system data 24 hours a day over the internet or 3G networks using the internal Ethernet ports. Given its simplicity, (uncertified, RAIM-only integrity, no redundancy), the IMMR delivers an efficient low cost GBAS signal monitoring utility/tool suitable for use during all phases of a GBAS /GRAS system deployment.

For more detailed information:

GMMReceiver Product Information