Leuven, Belgium – With threats to GNSS increasing daily, Septentrio has responded with a whole suite of defensive technologies which enable reliable positioning when Septentrio receivers encounter interference. These counter-measures include adaptive notch filtering, pulse blanking and GLONASS L2 band remapping. Working in concert, these and other analog and digital countermeasures, form Septentrio’s AIM+ (Advanced Interference Mitigation) technology. The effectiveness of AIM+ has been recently demonstrated in a number of real world interference mitigation demonstrations:
RUSSIA A farming community near Tuymen upgrading to high precision Real Time Kinematic (RTK) GPS systems for autosteer and precision-farming was having trouble bringing up the service. Local base stations for RTK corrections were suffering high levels of local interference. Equipping the base stations with Septentrio AIM+ technology, and activating the adaptive notch filtering feature, suppressed the interference and cm positioning became possible.
NETHERLANDS GNSS receivers in Hilversum had trouble maintaining an RTK fix, but Septentrio traced this to an amateur radio digipeater which was interfering with GLONASS L2. Once the adaptive notch filter was enabled, the interfering signal was identified and actively suppressed. More importantly the C/N0 of the L2 signal was much less affected.
BELGIUM The GNSS L5 band is also used by Distance Measuring Equipment (DME) beacons and Tactical Air Navigation (TACAN) beacons. High-power pulses from the “BUB” DME beacon at Brussels Airport (Belgium) fell directly into the GNSS L5 band. The AIM+ pulse blanking unit was able to suppress the interfering pulses, showing that the AIM+ pulse blanking unit is indispensable for any receivers operating near DME stations.
Construction and piling work on the dyke in Ostend had to be interrupted as all GNSS signals were heavily disturbed by nearby radio/TV amateur equipment. Septentrio’s unique L2 band remapping feature effectively tackled this problem. All harmful signals were filtered out, eliminating compromised GLONASS signals, and dual-frequency GPS signals remained fully usable.
In many cases, Septentrio multi-constellation receivers are able to maintain position accuracy and availability even when a whole GNSS band is jammed, thanks to the redundancy of GNSS signals.
Peter Grognard, Founder and CEO of Septentrio Satellite Navigation said, ‘Recent incidents involving Unmanned Aircraft have highlighted the need for serious countermeasures and fortunately Septentrio’s receivers with AIM+ are ready now! Septentrio’s AIM+ technology, combined with our commitment to offer receivers using all navigation signals in the sky, ensures customers of the highest attainable performance – even in the most challenging conditions.’
Septentrio Satellite Navigation NV designs, manufactures, markets and supports high-end OEM GNSS receivers for demanding professional navigation, positioning and timing applications. Septentrio is Europe’s leading manufacturer of professional GNSS receivers. Septentrio has an international team of experts in all areas of satellite navigation receiver design and applications. For more information about Septentrio, and in particular to access our White Paper ‘GNSS Interference’, please visit our website at www.septentrio.com