A Scintillating Project

August 1, 2015By
Setting up the receiver antenna for the offshore trial on board the Geograph vessel.

Countering Ionospheric Disturbances Affecting GNSS in Brazil By Marcio Aquino After 27 months of intense research, the CALIBRA project ended successfully in February 2015, with the project team devising solutions to tackle the effects of perturbations typical of the Brazilian ionosphere on high-accuracy GNSS positioning. CALIBRA was funded by the European Union and the European GNSS Agency. Kicked off in 2012, CALIBRA first confirmed the vulnerability of... read more

UNB’s PPP Software Centre v2.0 Beta Now Available

June 17, 2015By

The PPP Software Centre, an email-based Online PPP comparison utility hosted by the University of New Brunswick, is once again functioning with its release of version 2.0 Beta following an extended hiatus while being rewritten. The centre is a convenient method for the GNSS community to compare results from several online precise point positioning services. For a more detailed description, including submission instructions, see the homepage at http://www2.unb.ca/gge/Resources/PPP/. Note that... read more

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DeepOcean Hires Fugro for Fleet Positioning

May 28, 2015By

Fugro has been awarded a contract by subsea contractor DeepOcean for the provision of precise satellite positioning for its fleet. The contract is valid for three years and also includes the new vessels in DeepOcean’s expanding fleet. The DeepOcean fleet will be equipped with hardware and software developed by Fugro, providing independent positioning solutions on each vessel. Under the contract, Fugro will... read more

Navcom StarFire – Precise Point Positioning (PPP)

NavCom’s StarFire Network is a global satellite-based augmentation system (GSBAS) that provides five centimeter positioning accuracy on a worldwide basis. read more

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Tallysman GPS/GNSS Antennas Available in Australia, New Zealand

April 7, 2015By
TW4421 wideband dual-feed GPS/GLONASS antenna.

Two dual-feed GPS/GLONASS antennas from Tallysman’s GNSS antenna range are now available in Australia and New Zealand through M2M Connectivity. Tallysman is a Canada-based developer of high-performance GNSS antennas focused on the requirements for precision and multi-constellation GNSS receivers. Featuring a dual-feed wide-band patch element, Tallysman’s TW2410 and TW4421 antennas cover the GPS L1, GLONASS G1 and SBAS (WAAS, EGNOS and MSAS) frequency band... read more

Innovation: Carrier-Phase Ambiguity Resolution

April 3, 2015By
FIGURE 9. Network used for the triple-frequency PPP study.

Handling the Biases for Improved Triple-Frequency PPP Convergence
Precise point positioning (PPP) can be considered a viable tool in the kitbag of GPS positioning techniques. One precision aspect of PPP is its use of carrier-phase measurements rather than just pseudoranges. But there is a catch. Often many epochs of measurements are needed for a position solution to converge to a sufficiently high accuracy. In this month’s column, we look at how using measurements from three satellite frequencies rather than just two can help. read more

Veripos Offshore PPP Services Improve Accuracy

March 11, 2015By

Veripos, a supplier of high-precision GNSS positioning facilities to offshore and associated industries, has upgraded its Apex and Apex² precise point positioning (PPP) services. The services now typically provide users with a horizontal position accuracy of better than 5 cm and 12 cm in the vertical at the two sigma (95 percent) confidence level. The enhanced levels of performance, now available to... read more