Geodetic Reference Networks

Geodetic Reference Networks – History – Survey markers

Historically, the location object or building on earth was triangulated by measuring the distances/angles from known points, Survey Markers, set on the earths surface. Benchmarks were one type of Survey Marker, gaining their name from being a horizontal mark chiselled into a stone structure where a surveyor could place a piece of angled metal in order to ‘bench’ a levelling rod.

Geodetic Reference Networks - Today

The technology may have become more advanced, using the triangulation from satellites to determine a location on earth, however, when looking for accuracy of this location, the principle of using a fixed survey point hasn’t changed.

Surveying with a ‘rover’ or using a drone and your own ‘base station’ combination will achieve CM accuracy relative to where the base is placed.

To achieve absolute results, a surveyor will need to conduct their survey in relation to a known point.

While setting up a base on these locations would work well in theory, it isn’t ideal to stand one on the edge of a public bridge for 8 hours while a local survey is carried out.

Instead corrections can be used. Sent over the Internet from a ‘local’ known point within 60km of the survey location, a Geodetic Reference Station.

Geodetic Reference Networks – Importance of accuracy

Geodetic Reference Networks require extremely precise GNSS equipment. They have several vital roles which include monitoring of all broadcast GNSS signals (from all constellations) as a result of this they produce highly accurate, precise GNSS measurements.

Antennas used for Geodetic Reference Networks have to have a tight phase centre variation and a very accurate measurement of phase centre offset.

Geodetic Reference Stations - How can we help?

Given the critical nature of the information provided by the Geodetic Reference Networks and the requirement for high precision, high accuracy antennas.

Innovelec are pleased to offer All Band All Constellation GNSS Antennas providing low axial ration from horizon to horizon and very tight phase centre variation as low as less than 1mm.

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