From the Magazine

Tracking RFI: Interference localization using a CRPA

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A controlled radiation-pattern antenna can preserve GNSS positioning while providing at least an azimuth angle towards an interference source. If integrated with an attitude and heading reference system, only a few lines of position pointing towards the RFI source could provide a fast indication of the probable ground location. read more

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System of Systems: FCC seeks comments on Galileo use in US

February 4, 2017By
Galileo satellites 15–18 being deployed from their dispenser, two at a time. (Artist’s rendering: ESA)

FCC seeks comments on Galileo use in US The Federal Communications Commission (FCC) is inviting public comments on the European Commission’s request for a waiver of licensing requirements applicable to Galileo receivers in the United States. Comments are due Feb. 21. Read the notice here. If the waiver is approved, Galileo-capable receivers won’t need to be licensed in the U.S.... read more

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Qualcomm Research: Robust positioning from visual-inertial and GPS

Figure 2: Part of the walk trajectory, passing through a building, where GPS is unavailable.

Presented at ION GNSS+, September 2016 GPS positioning in urban scenarios is challenging because of large numbers of non-line-of-sight outlier measurements. We propose a robust positioning algorithm that combines GPS observations with visual-inertial odometry information to handle such outliers. We demonstrate the effectiveness of our algorithm in a simulation scenario with close to 80-percent outliers. In experiments in a mild... read more

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Robotic riverbed survey reveals unseen depths

January 17, 2017By
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The Ribble River flowing through Preston in Lancashire, United Kingdom, has hidden depths. “The challenge with rivers is that much of the beauty and interest is hidden from view beneath the surface,” said Jack Spees, CEO of the Ribble Rivers Trust. “To reveal this beauty, we undertook a bathymetric survey of a section with particularly interesting features that is adjacent... read more

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Innovation: Correlator beamforming for low-cost multipath mitigation

January 13, 2017By , and
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GNSS Pest Control
A new solution for GNSS multipath employs a multi-element antenna with RF signal switching and a single front end to reduce complexity, power consumption and cost. Correlator beamforming, initially used in the 2.4 GHz frequency band where it has proven effective at mitigating multipath in heavy industrial environments, has been successfully adapted for GNSS use. read more

Case study: Firms collaborate on product development

January 12, 2017By
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Professional GNSS users now expect lightweight, easy-to-use receivers optimized for their particular workflows. Meanwhile, a streamlined manufacturing process means design and production of sophisticated instruments now takes months rather than years, and relies on global teams of networked specialists. Carlson Software approached Hemisphere GNSS in early 2015 with the goal of bringing a new GNSS receiver to market, one optimized... read more

Galileo declares: Open for business!

January 11, 2017By
Galileo Goes Live! ceremony in Brussels: European Commission Vice-President Maroš Šefčovič, responsible for the Energy Union, and Commissioner Elżbieta Bieńkowska, responsible for Internal Market, Industry, Entrepreneurship and SMEs, count down to hit the “Go” button.

At a Dec. 15 ceremony in Brussels titled “Galileo Goes Live,” two high officials of the European Commission issued the Galileo Initial Services Declaration. Plus: Ground control upgrade for GPS III approved; GPS funded at $847 million for FY 2017. read more

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Research: RTK with tight coupling of 6 low-cost sensors

January 10, 2017By and
Performance of RTK positioning, a fusion of GNSS and inertial sensors, in the city center of Munich.

A tight coupling of GNSS and inertial measurements is needed for both accurate and reliable positioning. The use of multi-GNSS is recommended to obtain a sufficient number of visible satellites in any outdoor environment. read more

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