Inside GNSS magazine • Volume 4, Number 5
Online News, Articles, and Features
A Secure Civil GNSS for Today
Stanford University researchers teamed with a provider of on-chip,
in-system validation technology to develop new signal authentication
software that uses hidden attributes fundamental to the GPS satellite
broadcast, rather than predictable characteristics of the GPS signal.
These attributes are cross-compared between receivers to authenticate
received signals and the location solutions they generate.
GNSS-R Data Processing Software and Test Analysis
Authors from a leading Chinese university describe how reflected GNSS signals can be used in sea-wind retrieval, seawater salinity detection, ice-layer density measurement and other remote sensing applications. They introduce the GNSS-R concept, demonstrate the characteristics of the GPS reflected signal, and describe their data-processing method for exploiting the reflected signals.
A Recipe for a Multi-System, Multi-Frequency GNSS Receiver
The step-by-step design of a modular software GNSS receiver developed at the University of Calgary. The article examines challenges, trade-offs, results, and next steps. The authors describe how the PLAN software receiver worked as a signal-monitoring tool to analyze the L5 signal broadcast by GPS satellite SVN 49.
In this installment of the series, the author uses Matlab to illustrates aspects of aviation navigation using EGNOS signals to augment GPS.
Columns & Editorials
Enlarging the GNSS pie is better than fighting over the size of the pieces.
It's hard to imagine that 20 years can embrace nearly the entirety of the
public presence of a phenomenon such as the Internet or GNSS.
More and more mobile devices integrate GNSS —and this increases the pressure to improve positioning capabilities indoors, in urban canyons and other difficult environments. Working Papers examines a novel use of peer-to-peer transfer of position information that combines GNSS and dead reckoning technologies with Bluetooth communications to assist positioning indoors.
GNSS data points and factoids to amuse and inform.
Cape Canaveral; Portland, Maine; Washington D.C.; SE of Los Barrios, Jaén, Andalusía, Spain; Ciompino, Italy; Baikonur space center, Beijing and Brussels
František Vejražka, Chris Rizos and Giancarlo Varacalli each review a new book in this issue.
The three books cover GPS fundamentals; the four GNSS systems; and GPS signals, measurement and performance.
Global Positioning System: Signals, Measurements, and Performance, Second Edition, by Pratap Misra and Per Enge
Second edition adds new information with didactical mastery and good literary sense.
Introduction to GPS: The Global Positioning System, Second Edition, by Ahmed El-Rabbany
GPS theory, hot topics clearly discussed without formulas or figures.
Global Navigation Satellite Systems: GPS, GLONASS, Galileo and More, by Bernard Hofmann-Wellenhof, Herbert Lichtenegger and Elmar Wasle
Authors of well-known GPS books address GNSS in a new textbook series.