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.
Mitigates adjacent band interference
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Patented DielectriXTM antenna technology provides sharp frequency selectivity that tightly tunes to the GNSS bands whilst blocking adjacent band interference
Reduces multipath interference
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Excellent circular polarisation purity (low axial ratio) without the need for a ground-plane, reduces multipath interference significantly
Platform independent
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Balanced and isolated from platform ground ensures high immunity to common-mode noise and very low proximity de-tuning caused by nearby objects
Suitable for high accuracy applications
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Tight phase centre and consistent group delay over wide azimuth variations enables use with carrier-phase GNSS (e.g., RTK)
