Columns and Editorials

February 13, 2019

Working Papers: Speed Verification in the Smart Tachograph

The Smart Tachograph (ST), the new revision of the Digital Tachograph (DT), aims to improve safety in the transportation sector by monitoring the behavior of commercial drivers. For this purpose, data from several sensors, including a GNSS receiver, are recorded, processed and cross-validated. In this article, the motion conflict procedure adopted by the ST is reviewed and experimentally evaluated using data collected in light urban and highway environments.

Read More >

By Günter W. Hein

International Committee on GNSS-13 Focuses on PNT in High Earth Orbit and Beyond

Since last reported in the November/December 2016 issue of Inside GNSS, significant progress has been made to extend the use of Global Navigation Satellite Systems (GNSS) for Positioning, Navigation, and Timing (PNT) in High Earth Orbit (HEO). This update describes the results of international efforts that are enabling mission planners to confidently employ GNSS signals in HEO and how researchers are extending the use of GNSS out to lunar distances.

Read More >

By Inside GNSS
February 7, 2019

Scalable, Traceable Time for Datacenters Using GNSS and White Rabbit

Accurate and reliable timing and synchronization can be an enabler of diverse new applications in datacenters. Accurate clocks across different nodes make possible key functions like consistency, event ordering, causality and the scheduling of tasks and resources with precise timing. In this article the authors take a close look at scalable and traceable time for datacenters using GNSS and White Rabbit.

Read More >

By Inside GNSS
December 9, 2018

BlueGNSS Project – A Step Towards E-GNSS Harmonization in the Air Navigation Sector

BLUEGNSS is a project developed in the framework of the Horizon 2020 (H2020) program involving four ANSPs of different European countries (Italy, Cyprus, Greece, and Malta) plus one industrial partner, IDS (Ingegneria Dei Sistemi). The project objective is to harmonize the implementation of PBN approach operations among the BLUE-MED FAB States. This article provides an overview of the phases required to reach this goal and focuses on GNSS performance assessment as recommended by ICAO.

Read More >

By Inside GNSS
December 6, 2018

What Is Snapshot Positioning and What Advantages Does It Offer?

Snapshot positioning is a technique for determining the position of a Global Navigation Satellite System (GNSS) receiver using only a very brief interval of the received satellite signal, where the sampling time can be more than 100 milliseconds (ms) or even down to as little as 2 ms. In comparison, a conventional GNSS receiver may require anywhere between a few and tens of seconds of signal tracking before it is able to compute its first position.

Read More >

By Mark Petovello

Innovative Test System for GNSS Signal Performance Analysis in Real Environments Part 2

This article — Part 1 was published in the September/October 2018 issue ­— presents the authors’ experience in setting up an airborne pseudolite (UAVlite) with the needed ground-based infrastructure to perform code and phase ranging performance analysis. UAVlites transmit GNSS-like signals free from any local transmitter multipath (in contrast to ground-based transmitters) and can in principle be localized in real-time through a synchronized network of ground stations which may also broadcast the UAVlite positions in real-time.

Read More >

By Günter W. Hein
December 4, 2018

GPS Investigations in Japan, and Privacy Concerns

The legal and privacy issues surrounding GPS investigations have come to the forefront around the globe in recent years. Recent court rulings in both Japan and the United States provide insights into the future. Here we summarize and examine a decision by the Japanese Supreme Court and relevant lower court’s decisions, as well compare the Japan decision and the mosaic theory from an earlier U.S. court decision.

Read More >

By Ingo Baumann
December 3, 2018

Chris Hegarty – Never A Dull Moment

As anyone who’s been there knows, Boston is one of the best places in America for home-grown Italian cooking. And the city is also home to one of the world’s greatest St. Patrick’s Day parades. Another slightly lesser known but no less impressive product of the Boston melting pot is top-flight GNSS man Christopher Hegarty.

Read More >

By Peter Gutierrez
September 26, 2018

DHS Taking a Risk-Based Look at PNT Resilience

The Department of Homeland Security (DHS) has launched a new effort to ascertain the real-world risks posed by the loss of positioning, navigation and timing (PNT) service and how those risks might be reduced, said James Platt, director of DHS’s PNT Program Management Office. On the table is testing, best practices, partnerships, a new management approach and possibly standards and a backup system.

Read More >

By Dee Ann Divis
September 25, 2018

Innovative Test System for GNSS Signal Performance Analysis in Real Environments | Part 1

This article presents the authors’ experience in setting up an airborne pseudolite (UAVlite) with the needed ground-based infrastructure to perform code and phase ranging performance analysis. UAVlites transmit GNSS-like signals free from any local transmitter multipath (in contrast to ground-based transmitters) and can in principle be localized in real-time through a synchronized network of ground stations which may also broadcast the UAVlite positions in real-time.

Read More >

By Günter W. Hein

GNSS Spoofing and Aviation: An Evolving Relationship

One of the great engineering successes of the International Civil Aviation Organization (ICAO) and its expert panels is the standardization of globally harmonized Communication, Navigation and Surveillance (CNS) systems. These standards, sometimes supported by more detailed industry standards, provide safe and interoperable services between aircraft and the ground and space systems supporting them.

Read More >

By Gerhard (Gary) Berz
1 2 3 … 29