TAG: ionosphere

Innovation: Galileo cycle-slip detection

September 1, 2016By and
FIGURE 3.  Statistical and absolute thresholds.

How four frequencies help when the ionosphere is disturbed The authors explore how cycle slips in Galileo carrier-phase measurements can be more effectively detected using four frequencies. MORE SATELLITES OR MORE SIGNALS? That was the question put to the delegates at GNSS Election ’08, the stimulating and amusing entertainment provided at the GPS World Leadership Dinner held in conjunction with The... read more

Demonstration tests positioning in the far north

June 23, 2016By

A sea-based test is demonstrating the potential of extending satnav augmentation coverage into north polar regions, offering a safety-of-life standard of navigation performance to users including shipping or aircraft in flight. read more

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Innovation: There’s an app for that

June 13, 2016By
Figure 7. Total electron content in TECu across South America on Feb. 5, 2015, between 19:00 UTC and 19:15 UTC.

Using a smartphone for GNSS ionospheric data collection
In this month’s column, we take a look at the use of a smartphone app to collect GNSS ionospheric data. The authors' app-centric approach provides a software framework and output format that remain the same for different receivers. read more

PlanetiQ signs weather satellite launch contract with India’s Antrix

December 3, 2015By
24 hours of data from 12 PlanetiQ satellites = ~34,000 occultations/day.

PlanetiQ has signed a contract with Antrix Corporation Limited, the commercial arm of the Indian Space Research Organization (ISRO), for the launch of PlanetiQ’s first two weather satellites on a Polar Satellite Launch Vehicle (PSLV) during the fourth quarter of 2016. Ten more satellites are planned for launch in 2017 to complete an initial set of 12 satellites that will... read more

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

GPS Data Show How Nepal Quake Disturbed Earth’s Upper Atmosphere

May 2, 2015By

The April 25 magnitude 7.8 earthquake in Nepal created waves of energy that penetrated into Earth’s upper atmosphere in the vicinity of Nepal, disturbing the distribution of electrons in the ionosphere. These disturbances were monitored using GPS signals received by a science-quality GPS receiver in Tibet, a neighboring region to Nepal. The data show that after the initial earthquake rupture (indicated... read more

Out in Front: Good News for Modern Nav

May 1, 2015By

This year’s European Navigation Conference in Bordeaux, France, got underway with “Good news from up there .…” Galileo’s seventh and eighth satellites launched successfully in late March, the European Space Agency (ESA) plans four more satellites to reach orbit in 2015, and space maneuvers for Galileo 5 and 6 have been completed, with a recovery plan currently under study. ESA... read more

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Project Counters Ionospheric Disturbance for GNSS

April 27, 2015By

After 27 months of intensive research, a project team funded under the European Union’s 7th Framework Programme has come up with a solution to counter the problem of ionospheric disturbance affecting GNSS signals. The CALIBRA project recently showcased a commercially applicable approach to mitigate the phenomenon’s impact on high-accuracy GNSS positioning techniques. In  two demonstrations, the project’s newly developed algorithm was... read more