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Inside GNSS magazine • Volume 5 Number 4

June 2010

Online News, Articles, and Features

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Cover Story

Going Deep

Blending GNSS with 3-D Sonar Imaging for Underwater Applications

A robust and precise navigation system uses multiple sensors. This article explores a 3-D sonar image technology that works deep underwater in times and places where high security is key and GNSS cannot go.

Articles
Technical Article

The GPS Assimilator

Upgrading Receivers via Benign Spoofing

Interference, jamming, and spoofing are hot topics in the GNSS community. How do you trust your receiver? The authors use work they’ve done on spoofing to upgrade existing GPS user equipment for improved accuracy, robustness, and resistance to deceptive signals.

Technical Article

CAPS — China’s Regional Navigation Satellite System

A good deal of attention is focused on Compass (Beidou-2) GNSS. But China also has a regional system called CAPS — for Chinese Area Positioning System. Here’s the story about its history, system architecture, problems and advantages.

Series

Easy Suite II

easy17—Visualizing Satellite Orbits, easy18—Computing Range and Range Rate Corrections

In the final two installments of the series, the author describes what
GPS orbits would look like from various perspectives and
explains how to solve for range and range-rate corrections at a GPS
base station.

Columns & Editorials
Working Papers

Aviation Applications

Part I: Hybrid Navigation Techniques and Safety-of-Life Requirements

The publicly-funded German UniTaS IV project investigates problems in the application of satellite navigation for aviation.  The authors studied adaptive beamforming antennas, a GNSS landing system that incorporates inertial sensors with a ground-based augmentation system (GBAS), multi-constellation RAIM (receiver autonomous integrity monitoring), and jamming, spoofing, and authentication of signals. Here are their results. (Part I of II)

Thinking Aloud

Deselecting Unavailability

The ten year anniversary of the death of Selective Availability

In 2000 the United States turned off GPS selective availability. The consequences of that decision — probably immeasurable at that moment — are still rippling through the world today as the number of GPS receivers in use soars toward the billions.

GNSS Solutions

The Math of Ambiguity

What is the acquisition ambiguity function and how is it expressed
mathematically?

GNSS Hotspots

GNSS Hotspots

GNSS data points and factoids to amuse and inform

Nassau County, New York; Slettestrand, Denmark; Trieste, Italy; Abuja, Nigeria; Kiev/Kyiv, Ukraine; NASA solar observatory

360 Degrees
Industry View
China Satellite Navigation Conference
Signals
Trimble
Trimble
Jammer Dectector
Sensonor
Spectracom
CAST
NovAtel
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