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22 November 2000 Telecoms, Datacoms, Wireless, IoT

Trimble has announced a new solution for Global Positioning System (GPS) infrastructure. The new Virtual Reference Station (VRS) enables centimeter-level positioning without the need to set up a local reference station. This enables users to achieve long-range, realtime kinematic (RTK) precision over greater distances via wireless communications in the field.

Developed by Spectra Precision's subsidiary TerraSat, the VRS consists of software and a network of Trimble GPS receivers communicating with a control centre. The VRS software uses the data to calculate GPS error corrections that are applicable over a wide area. These error corrections are transmitted via wireless communication devices (radios or cellular phones) to users in the field within the network area. Additionally, users can retrieve stored GPS correction data from the control centre via the Internet for postprocessing.

VRS technology overcomes previous limitations with high precision GPS. According to Trimble the system significantly reduces systematic errors in the reference station data to improve reliability and operating range, allowing a user to increase the distance at which the rover receiver is located from the physical reference stations while improving on-the-fly (OTF) initialisation times. Traditionally, for precise GPS applications-surveying, construction, precision farming and high accuracy GIS-roving receivers required a reference station within 10 km to ensure centimetre-level accuracy. Users can operate at distances up to 50 km without degrading accuracy. Trimble claims this is at least 3 times greater than before.

See www.trimble.com and www.spectraprecision.com

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