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Inside GNSS magazine • Volume 6 Number 3

May/June 2011

Online News, Articles, and Features

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Modernization Times

Col. Bernard Gruber and the GPS Enterprise

A year into the job, the commander of the GPS Directorate tells how the nation’s leading PNT program is working to synchronize modernization of the space, operational control, and user equipment segments.

Technical Article

Keeping the Spoofs Out

Signal Authentication Services for Future GNSS

A review of anti-spoofing methods and a proposal for a new approach that is based on signal authentication sequences that can be integrated into GNSS. The article describes the necessary receiver architecture and BOC modulation, as well as a protocol implementation example for a specific GNSS system.

Columns & Editorials
Thinking Aloud

A Target — Possibly Moving

Who is responsible for protecting mobile satellite services?

The FCC’s new report repudiates the principle that latecomers to an RF band must ensure their operations do not harm existing users.

Working Papers

Finding the Interference

Karunhen-Loeve Transform as an Instrument to Detect Weak RF Signals

In GNSS, signal interference and jamming is difficult to solve because of low signal power on the ground and the large distance the satellite signals must travel. However, a mathematical tool — the Karhunen-Loève Transform — can help detect interfering signals with power levels even lower than those usually received on earth from GNSS satellites today.

GNSS Solutions

How do you compute relative position using GNSS?

This time, column editor Mark Petovello answers your question himself.

Washington View

Homeland Security Steps Up to Protect GPS (But Not from LightSquared)

The Washington View

DHS may pick up the pace on its six-year-long stroll for meeting mandates on GPS interference, while the FCC presses on with LightSquared broadband plan in L1 spectrum.

GNSS Hotspots

GNSS Hotspots

GNSS Data Points and Factoids to Amuse and Inform

GNSS factoids from Humboldt-Tolyabe National Forest, Bolivia, Kourou, Xichan Launch Center, Space...the Final Frontier

Thought Leadership Series

RF Spectrum Allocations, Interference, and GNSS Receiver Design

Here’s a cold, hard fact about radio frequency spectrum: it’s finite, and no one is making any more of it. And here’s another fact: It’s crowded.

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