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Inside GNSS magazine • Volume 9 Number 4

July/August 2014

Online News, Articles, and Features

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Cover Story

GPS Receiver Performance On Board a LEO Satellite

The Navigation and Occultation eXperiment
A test and evaluation program demonstrates that a commercial GPS receiver can operate as a spaceborne research tool.
Articles
Technical Article

Environmental Sensing

A Revolution in GNSS Applications
Increasingly sophisticated uses of GNSS observables have led to a new era in remote sensing. A team of researchers describe the results of the applications of interferometric reflectometry to measure snow depth, vegetation water content, and soil moisture.
Technical Article

A Universal GNSS Software Receiver Toolbox

For Education and Research
GNSS software defined radio receivers and associated research are proliferating rapidly as computer processing power increases and costs decline. The author describes the latest version of a universal GNSS SDR processing toolbox that is distributed as a plug-in for high-level algorithm development.
Columns & Editorials
Washington View

New Leaders at the GPS Helm

Changes across the board as a new threat to spectrum emerges
Changes across the board as a new threat to spectrum emerges
Thinking Aloud

The Next Big Mac

The ISEE-3 Reboot Project
The ISEE-3 Reboot Project is probably the best use of an abandoned McDonald’s hamburger stand that I’ve heard of.
GNSS Solutions

GNSS Position Estimates

How do measurement errors propagate into GNSS position estimates?
Working Papers

Assessing the Performance of GNSS Signal Acquisition

New Signals and GPS L1 C/A Code
The low power and spread spectrum nature of GNSS signals make their detection and acquisition a key, but challenging aspect of receiver processing designs. A team of researchers investigated the performance of four new GNSS signals and the legacy GPS L1 C/A code, comparing their probability of detection at a specific level of received signal strength. Factors of particular interest included the bit sign transition, acquisition bin size, and uncompensated code Doppler.
GNSS Hotspots

GNSS Hotspots

Hotspots in Portland, Oregon; Cape Canaveral and Kourou; Greenwich, UK; Barcelona and London; Beijing and Cupertino, California
Adidas introduces a smart soccer ball; Another GPSII-F and two Galileo FOC ready to go; Longitude Prize Redux; Yahoo Labs algorithm identifies the most pleasant route; and China calls iPhone location function a security concern
Thought Leadership Series

GNSS & Geohazards

Early Warning for Life on the Faultline
For at least 20 years, GPS experts, geodesists, and public agencies have been working together to develop high-accuracy, large-scale continuously operating GPS reference stations that provide them the capability to monitor and model crustal deformation, tectonic plate movement, and the effects of geohazards such as earthquakes and volcanic eruptions. Now, GNSS-augmented advance warning systems are going into place that can give us a crucial margin of safety in the event of an earthquake.
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