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Inside GNSS magazine • Volume 1, Number 4

May/June 2006

Online News, Articles, and Features

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Cover Story

GNSS Album: Images and Spectral Signatures of the New GNSS Signals

There are lots of radio signals out there carrying modernized GNSS navigation messages of crucial importance to users and product designers. The authors of this article use RF monitoring technologies to capture and characterize tehse new signals in space from GPS, GLONASS, Galileo, and Beidou.


Galileo Light Show: First Laser Range Measurements to GIOVE-A

Ground tracking networks typically calculate GNSS orbits based on differences between the ground stations’ precisely known locations and the ranging signals received from the satellites. However, researchers also can use another method of precise orbit determination: satellite laser ranging. This article from authors at the UK Space Geodesy Facility describes the technique and the first results from tracking the Galileo spacecraft now in orbit.

Human Engineering

Karen Van Dyke: Re-Engineering the Airways

Someday, coordinates will be part of every product and process in our lives, says GPS innovator Karen Van Dyke of the Volpe Transportation Systems Center. As one of the engineers working towards that goal, she uses GNSS to make the air transportation infrastructure more reliable, less vulnerable, and easier to monitor.

Technical Article

Attitude Adjustment: Devising and Flying a Low-Cost GPS-Based Backup

General aviation pilots often find themselves caught between a desire to keep equipment costs low and yet ensure redundancy in case of failure of a critical flight instrument. This article describes the implementation and test of a low-cost, GPS-based backup attitude indicator that relies on a $150 GPS receiver board, a popular PDA and an algorithm originally developed at MIT.

Technical Article

Mobile RTK: Using Low-Cost GPS and Internet-Enabled Wireless Phones

An ever-increasing number of mobile handsets come equipped with GPS and some with inertial sensors. However, these single-frequency units do not exploit the higher accuracy possible with real-time kinematic (RTK) techniques. Now a group of Nokia researchers are developing a software-only RTK solution using the hardware and wireless connections already existing in mobile phones.

Columns & Editorials
Thinking Aloud

GNSS Marketplace

When one GNSS system needs to gets up to speed, the others pick up the slack

In an industrious and cooperative surge of activity, we have seen three sets of draft specifications reach fruition in the last few weeks: publication of a joint recommendation for design of new civil signals on GPS and Galileo, the Galileo Interface Control Document, and the GPS L1C interface specification.

Working Papers

MBOC: The New Optimized Spreading Modulation

Recommended for Galileo L1 OS and GPS L1C

This article introduces the multiplexed binary offset carrier (MBOC) spreading modulation recently recommended by the GPS-Galileo Working Group on Interoperability and Compatibility for adoption by Europe’s Galileo program for its Open Service (OS) signal at L1 frequency, and also by the United States for its modernized GPS L1 Civil (L1C) signal. The article provides information on the history, motivation, and construction of MBOC signals. It then shows various performance characteristics and summarizes their status in Galileo and GPS signal design.

GNSS Solutions

New GNSS Frequencies, Advantages of M-Code, and the Benefits of a Solitary Galileo Satellite

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