Magazine Section Archives - Inside GNSS

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June 14, 2018

(In)Feasibility of Multi-Frequency Spoofing

Recent presentations and publications have suggested that multi-frequency spoofing is infeasible using low-cost, off-the-shelf equipment, and that a good defense against any but well-funded and technically competent adversaries would be to use a multi-frequency capable survey grade receiver. The authors of this article wish to demonstrate that this is definitively false.

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By Inside GNSS
April 4, 2018

GNSS Analysis Tools from Google

Authors: Frank van Diggelen and Mohammed Khider
Google has publicly released GNSS Analysis Tools to process and analyze GNSS raw measurements from your phone. These tools enable manufacturers to see in detail how well the GNSS receivers are working in each particular phone design and thus improve the GNSS design and performance in their phones. Also, with the tools publicly available there is significant value for app-developers, researchers and educators. Here, the authors show what these tools do, and how they reveal details of receiver and signal behavior that are not possible to observe without raw measurements.

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By Inside GNSS
January 26, 2018

GNSS Hotspots

1. Last Remaining Peatlands
County Kerry, Ireland

√ Ireland is known for its lush green wetlands and raised bogs, also known as peatlands. But most of these areas have been lost due to drainage associated with peat cutting or conversion to agricultural land, according to Wetland Surveys Ireland (WSI). There’s a big push from Europe to conserve the remaining peatlands

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By Inside GNSS
January 24, 2018

GSA’s GNSS Opinion Leaders

Michael Ritter is president of Hexagon Positioning Intelligence and also serves as president and CEO of NovAtel Inc. “One of the businesses we are in is making high-end, very-high-signal-quality, very-low-group-delay GNSS receivers,” Ritter told us.

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By Inside GNSS
January 1, 2018

The Persistence of Quality

After spending a career as a GNSS advocate and critic, technical interpreter and PNT raconteur, our colleague, Glen Gibbons, begins his transition to Editor Emeritus status this month. And while his daily GNSS activities cease, his contribution for thoughtful analysis, cogency and a reasoned perspective are retained—his imprimatur, gratefully accepted.

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By Inside GNSS

What is navigation message authentication?

Q: What is navigation message authentication?  

A: As of today, all open civil GNSS signals are transmitted in the clear, conforming to interface specifications that are fully available in the public domain. Receivers will accept any input that conforms to the specifications and treat it as if it came from a GNSS satellite. Combined with the extremely low power levels of GNSS signals this makes it almost trivially simple to spoof a GNSS receiver.

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By Inside GNSS

Spectral Transparent Adhesive

In the past two decades, satellite navigation systems have undergone great development. The development of new generations of global navigation satellite systems (GNSS), represented by GPS III, Galileo, and the BeiDou global system (BDS), is rapidly advancing.

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By Inside GNSS

How Effective Are Signal Quality Monitoring Techniques

Multipath is a major phenomenon that degrades the integrity of GNSS-based navigation services. Under multipath, a receiver Delay-Lock Loop (DLL) does not correctly estimate the actual peak of the correlation curve, resulting in ranging errors. To overcome this effect, mitigation techniques have been developed, a detailed discussion of which

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By Inside GNSS
November 27, 2017

Unfinished Business

All good things must come to an end. At which point, if Fortune smiles on us, other good things begin or continue.

Case in point: as of year-end 2017 I am promoting myself to Editor Emeritus of Inside GNSS and turning to some unfinished business that I have with life. Of course, after 28 years I still have some unfinished business with GNSS, this amazing technology and industry that has more growth ahead of than behind it, more prospects for innovation, more unfinished business than ever.

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By Inside GNSS
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