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Inside GNSS magazine • Volume 7 Number 3

May/June 2012

Online News, Articles, and Features

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Cover Story

Truth on the Range

USAF's New Reference System

How do you tell when close is close enough? That depends. If you’re referring to a friendly game of horseshoes the answer could be several feet. However, if it’s the United States Air Force’s new-generation “gold standard” for GPS test capability — the Ultra High Accuracy Reference System — the answer is “mere centimeters.” This article describes the operational requirements, design, installation, and demonstration testing of the non-GPS–based positioning system (NGBPS)subsystem of the UHARS for the Central Inertial and GPS Test Facility in New Mexico.

GNSS Forum

GPS Receiver Specifications

Compliance and Certification

What emerged during the LightSquared controversy as an effort to protect GPS spectrum has evolved into a wider discussion about receiver standards and certification. But its not the first time the latter subject has come up. In the following commentary, a long-time GPS policy expert suggests an approach to framing the issue.

Technical Article

Demystifying GLONASS Inter-Frequency Carrier Phase Biases

Digital versus Analog

Where do GLONASS inter-frequency carrier phase biases in GNSS receivers come from? The authors show that the well-known decimeter-level linear biases affecting GLONASS carrier phase measurements are a function of the digital signal processing methods used in receivers.

Columns & Editorials
Thinking Aloud

IP Rights and Wrongs

Encroaching upon the commonwealth of GNSS

people have tried to reinvent the wheel, but no one has gotten into a patent
fight over it.

Washington View

USPTO Nears Approval of Troubling British Patent on New GPS Civil Signal

The U.S. Patent and Trademark Office (USPTO) is weeks away from approving a controversial British patent that could force American consumers to pay more for navigation devices and affect the operations of the American military.

Washington View

A European Perspective on Patent Dispute over GPS-Galileo Civil Signal

Sidebar to Washington View: USPTO Nears Approval of Troubling British Patent on New GPS Civil Signal
Working Papers

Difference Correlators

Does Indoor Carrier Phase Tracking Allow Indoor RTK?

Difference correlators represent effective means to remove signal dynamics from correlator values and to dramatically increase the coherent integration time, thus, also increasing the carrier phase tracking sensitivity. In tests described here, a difference correlator software algorithm shows promising results both indoors and in a forested area.

GNSS Solutions

How do GNSS-derived heights differ from other height systems?

GNSS Hotspots

GNSS Hotspots

Sierra Nevadas grow and Venice sinks, GLONASS-K testing, traffic updates, jamming, ships at sea and more

In this issue: GPS and InSar together tell more about Venice and the Sierra Nevada range, GLONASS-K testing delayed, Indian airports to install GAGAN, North Korea jams GNSS,  Chinese fishing boats use Compass, SatNavs for elderly drivers

Thought Leadership Series

Multi-GNSS Integration

The Challenges of Diversity

With GNSS, the more, the merrier — true or false?

360 Degrees
Industry View
Jammer Dectector
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