Jamming signals often originate at low elevations from ground-based transmitters. By carefully designing the radiation pattern of a GNSS antenna such that it is less sensitive to signals arriving between -10° to +15° from horizon provides an effective mechanism for suppressing this interference.
Helix Geospace have developed a high-performance GNSS/GPS antenna that does just that. The Horizon Nulling Antenna (HNA) utilises a conical directivity pattern to minimise signals received at elevations below 15° (providing 15dB rejection) whilst supporting multiple constellations & bands for maximum satellite tracking (GPS L1/L5, Galileo E1/E5, and QZSS L1/L5).
Through utilising Helix's patented DielectriX technology, Helix's HNA is also very compact (ø75mm x 52mm) thereby providing the highest available signal-to-noise ratio in contested environments per unit of size/volume.
Helix's HNA is suitable for all GNSS applications including high-precision carrier-phase GNSS, and resilient PNT for telecoms networks and other critical national infrastructure (CNI).
Find out more here.
Patented DielectriXTM antenna technology provides sharp frequency selectivity that tightly tunes to the GNSS bands whilst blocking adjacent band interference
Excellent circular polarisation purity (low axial ratio) without the need for a ground-plane, reduces multipath interference significantly
Balanced and isolated from platform ground ensures high immunity to common-mode noise and very low proximity de-tuning caused by nearby objects
Tight phase centre and consistent group delay over wide azimuth variations enables use with carrier-phase GNSS (e.g., RTK)