Columns and Editorials

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April 19, 2019

Working Papers: Electric Propulsion Technology Overview

Efforts in the realm of electric propulsion have been both steady and cutting-edge. Past, present, and future projects are discussed along with both realized and potential mission benefits arising from this recent technology.

Electric Propulsion (EP) is a class of space propulsion, which makes use of electrical power to accelerate a propellant by different possible electrical and/or magnetic means. The use of electrical power enhances the propulsive performances of the EP thrusters compared with conventional chemical thrusters. Unlike chemical systems, electric propulsion requires very little mass to accelerate a spacecraft.

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By Günter W. Hein
matt-1248038-unsplash
March 21, 2019

Budget Brawl Could Impact GPS

The GPS community made real progress during 2018. The first GPS III satellite was launched, the contractor for the GPS IIIF satellites was chosen and work on the new ground system appeared to be on a good track. In addition, after years of waiting, two of three requested Galileo signals were approved for official use in the United States and Congress ordered the building of a backup system for GPS timing.

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By Dee Ann Divis
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March 14, 2019

European Space Sector Gets Defensive

Officials representing the European Union are now publicly advancing the use of EU space assets, including the Galileo satellite-based navigation system, for military purposes. Galileo has traditionally been touted as a purely civil, purely nonmilitary system, but times and circumstances are changing.

The theme of the EU Space Week session Security and Defense was established by the introductory text that appeared in the event’s program: “The development of the European space sector has, from the outset, been linked to security, either that of the Member States or the EU itself.”

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By Peter Gutierrez
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Marco-Thinking
March 6, 2019

Galileo in 2019 … and Yet it Moves

Thinking Allowed

In the GNSS race launches are often quoted as the main event for the coming year — there won’t be another launch for Galileo until 2020. Despite this, in 2019 new capabilities are going to be introduced that will allow users to profit even more of the unique features offered by the Galileo system. As Galileo Galilei used to say “e pur si muove” (and yet it moves).

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By Inside GNSS
zheng-at-ION
February 15, 2019

Zheng Yao: Currents, Influence and Due Diligence

Zheng Yao was born in Beijing and grew up in a house full of books. His parents provided the foundation but didn’t push him in a particular direction. When he was a teenager, a video game changed his course forever. Zheng found his own way in life, ultimately distinguishing himself as an academician, a top-flight GNSS engineer, and as a son, husband and father.

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By Peter Gutierrez
gnsslaw

Impact of Geospatial Data Act of 2018 in U.S. – Time Will Tell

On October 3, 2018, the Geospatial Data Act of 2018 (GDA) was passed by Congress as part of the Federal Aviation Administration (FAA) Reauthorization Act of 2018. Two days later it was signed into law by the President. The GDA has been well received by the U.S. geospatial community. However, it will be several years before one can determine the impact that it will have on geospatial information management in the U.S.

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By Ingo Baumann
Transports Truck Driving in Tunnel
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.

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By Günter W. Hein
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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.

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By Inside GNSS
Server room interior in datacenter
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.

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By Inside GNSS
bluegnss
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.

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By Inside GNSS
mark-petovello
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.

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By Mark Petovello
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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.

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By Günter W. Hein
gnsslaw
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.

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By Ingo Baumann
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