Tallysman is pleased to introduce patented technology which produces the highest performing GNSS antennas in the World. The VeraPhase® technology provides:
- The lowest axial ratios from horizon to horizon across all GNSS frequencies
- The most stable and tightest Phase Centre Variations across all frequencies (+/- 1mm)
- The highest gain across all GNSS frequencies (1164 – 1300MHz + 1559 – 1610MHz)
This technology has proven to have a more stable PCV through all elevations and azimuths than any other antenna technology available today. For elevation angles greater than 15 degrees, the PCV varies less than 1mm making this technology ideal for RTK and PPP systems without having to rely upon antenna calibration data (such as RINEX files). Please refer to this document: VeraPhase Antenna for Survey Use
The stability and tightness of the PCV with respect to elevation and azimuth angles is unrivaled by any other antenna technology. As a result, the VeraPhase antennas are essentially insensitive to mis-orientation to North and not being level. This makes the antennas ideal for measuring movement and in moving situations, such as a rover in an RTK system.
The basic antenna structure has crossed driven dipoles which are fed in quadrature and tuned to the L2 frequency and a coupled radiating element dimensioned to resonate at L1. These components are positioned in an unusual circular waveguide with the back end tapered and shorted and with the upper edge formed as a non-uniform saw tooth shape. The upper part of the waveguide is built of many vertical strap conductors on a fixed radius and one circumferential strap conductor. This unusual structure allows the equalization of the magnitude and the achievement of quadrature phase of the z directed current and phi directed currents.
Please download our White Paper which provides much more technical detail about this exciting new technology: Tallysman Veraphase 6000 – White Paper
Dr. Richard Langley and Ryan White of the University of New Brunswick have compared the performance of the VeraPhase antenna to choke ring antennas. Their study results can be downloaded here.