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Detecting False Signals with Automatic Gain Control

April 1, 2012 - By

A component of most GPS receiver front-ends, the automatic gain control (AGC) can flag potential jamming and spoofing attacks. The detection method is simple to implement and accessible to most GPS receivers. It may be used alone or as a complement other anti-spoofing architectures. This article presents results from a baseline AGC characterization, develos a simple spoofing detection method, and demonstrate the results of that method on receiver data gathered in the presence of a live spoofing attack. read more

This article is tagged with , , , , , , and posted in Defense, Mobile

Expert Advice: Soldiers and Civilian GPS: Dangerous (and Deadly?) Expediency

April 1, 2012 - By

An old adage says, “Be careful what you wish for, you might get it.” That is particularly relevant in today’s world of GPS and the positioning, navigation, and timing (PNT) dependencies it has created. In business, it’s all about location, and in military circles, something called real-time situational awareness, driven by the ready availability of PNT from GPS. However, it has been reported (and validated by experience) that U.S. soldiers believe that the GPS equipment they are issued through official channels is too big, too heavy, uses too many batteries, and is old-looking and not sexy like the multi-color, multi-app personal electronics and smart phones they are accustomed to at home. read more

This article is tagged with , , , and posted in Defense, Opinions

Out in Front: Independence: A National Value

April 1, 2012 - By

Advanced low-frequency (LF) signals are back on the air in North America, with live testing of a wide-area precise-timing solution. Initial tests include a comprehensive pallet of signals, including eLoran, that are being evaluated for their ability to provide a robust, wide-area, wireless precise-timing alternative that can operate cooperatively with GPS, or during periods of GPS unavailability. read more

This article is tagged with , , , and posted in From the Magazine, Opinions

Innovation: Ionospheric Scintillations

April 1, 2012 - By

How Irregularities in Electron Density Perturb Satellite Navigation Systems
In this month’s column, the international Satellite-Based Augmentation Systems Ionospheric Working Group presents an abridged version of their recently completed white paper on the effect of ionospheric scintillations on GNSS and the associated augmentation systems. read more

This article is tagged with , and posted in From the Magazine, Innovation, OEM

Personal Privacy Jammers: Locating Jersey PPDs Jamming GBAS Safety-of-Life Signals

April 1, 2012 - By

When jamming interfered with GPS signals at Newark Airport, a three-month effort determined that low-power, mobile personal-privacy devices were responsible. This article describes how they were found and outlines how the observable parameters of such devices encompass a wide variation in RF spectra and internal modulation. read more

This article is tagged with , , , , , , , and posted in Mobile
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