Land survey / geodetics
Geodetic observing systems can provide significant benefits to our society in a wide variety of different applications in military, scientific research, and commercial areas, including landscape and sea level change monitoring, precision mapping for autonomous driving, precision agriculture, land surveying, etc.
Recognizing the growing reliance of a wide range of scientific and societal endeavors on infrastructure for precise geodesy, and recognizing geodetic infrastructure as a shared national resource, many organizations have evolved to contribute to a growing body of research and development to support the infrastructure needed to meet the demands for increasingly greater precision. Modern geodetic methods have enabled the positions of geodetic stations to be determined within a well-defined frame of reference; as a result, the long-term movements of the Earth’s surface can now be monitored at a level of approximately one millimeter per year. GNSS is used to position instruments on the Earth’s land and sea surfaces. Dense networks of GNSS stations are used to map the strain in the Earth’s crust at plate boundaries and to observe plate tectonics.
Reference networks serve multiple roles, including the performance monitoring of all signals broadcast by each GNSS constellation and producing accurate and precise GNSS measurements. Such geodetic reference networks require extremely precise antennas. Reference networks, which are used to enable RTK and PPP applications, consist of reference stations that require antennas that have the tight phase center variation and precisely known phase center offset. Geodetic quality antennas require a precise calibration, that estimates the phase centre offset at various frequencies (GPS L1, L2, L5 & L6 are typical). In addition to the phase center offset, the phase center variation as a function of azimuth and elevation angle is also calibrated, enabling the observations to be adjusted correctly.
Unictron has been serving GNSS industry for more than 25 years. With well-established R&D facilities and engineering team, Unictron has released a large variety of high precision positioning antennas with various dimensions and level of accuracy. If you have any needs in high precision positioning antennas, please feel free to contact our engineering or customer service teams.
