Geodetic reference networks require extremely precise antennas.
Reference networks serve multiple roles, including the performance monitoring of all signals broadcast by each GNSS constellation and producing accurate and precise GNSS measurements. Reference networks, which are used to enable RTK and PPP applications, consist of reference stations that require antennas that have the tight phase centre variation and precisely known phase centre offset.
Geodetic quality antennas require a precise calibration, that estimates the phase centre offset at various frequencies (GPS L1, L2 and L5 are typical). In addition to the phase centre offset, the phase centre variation as a function of azimuth and elevation angle is also calibrated, enabling the observations to be adjusted correctly. Additionally, to minimize multi-path choke ring antennas may be a required option.
Key features include:
- Accurate and precise positioning with Tallysman’s patented antenna technology
- Multi constellation coverage to maximize the number of observations available for position and time estimation (GPS, QZSS, GLONASS, Galileo, and BeiDou)
- Multi-signal and multi-band support
- Multi-path mitigation and/or excellent axial ratio with choke ring option
- Optional pre-filters to enhance out-of-band signal rejection
- IGS and NGS calibrated antennas
- Wide voltage range for broad receiver compatibility
- Various Low Noise Amplifier (LNA) gain options to support long antenna cable runs
- Strong electro-static discharge immunity
- Rugged construction