COVER STORY


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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ARTICLE


How the Parallel Use of GPS and Galileo Benefits Railway Applications

This article focuses on the research project Galileo Online: GO! – which with support from the Federal Ministry for Economic Affairs and Energy (grant number 50NA1510) designs and develops a reliable and high-precision receiver for multi-constellation and dual-frequency GNSS whose suitability and capabilities are tested in railway applications. Project results showcase the advantages of GPS and Galileo if used simultaneously in railway applications.

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SERIES


GNSS Opinion Leaders

Manuel Del Castillo – Broadcom pushing GNSS chipset boundaries

High-tech standout Broadcom has sold over one billion GNSS chipsets worldwide, leveraging all major global satellite navigation constellations and the full range of GNSS features, including Galileo’s dual-frequency and innovative BOC modulation capabilities.

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COLUMNS & EDITORIALS


Ligado Decision May Be At Hand

The federal government is rumored to be nearing a decision about Ligado Networks’ request to repurpose its satellite frequencies to also support a ground-based telecom network. Those frequencies neighbor the band used by GPS. Testing done both several years ago and more recently has shown such a system could seriously interfere with GPS receivers.

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How does Earth’s rotation affect GNSS orbit computations?

GNSS positioning is premised on the idea that the satellite positions are known, or can be calculated. Errors in the computed satellite position will manifest as ranging errors that degrade the positioning accuracy.

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Munich Hot Licks: Satellite Navigation 2018

This year’s Munich Satellite Navigation Summit featured pointed debates on high accuracy, integrity and authentication, exploring the trade-off between GNSS performance and security. And, as usual, there were some new products and systems looking to make a splash.

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Navigation Integrity for Land Users Robust Positioning in Challenging Environments

Integrity for Navigation Land Users (INLU) addresses the difficult task of adapting air-based position integrity solutions to land-based activities such as vehicle and rail travel. An end-to-end simulation is presented using the Positioning and Integrity Performance Evaluator (PIPE). The simulation includes side by side comparison of a vehicle path in the presence of spoofing as evaluated by the authors’ Generalized Pseudo Bayesian 1 (GPB1) algorithm and a snapshot least squares algorithm.

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GNSS HOTSPOTS


360 DEGREES


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