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TAG: spoofing

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Letter to the Editor: Automatic Gain Control, Spoofing

July 1, 2012

Just for the record: what is reported in “Detecting False Signals With Automatic Gain Control” (April GPS World) is what we introduced a long time ago and is reflected in one of our videos, and implemented in all of our GNSS receivers. AGC information is one of the four ways, and the least significant way, that we show interferences. There is a big difference between showing something in the laboratory and in some receivers, compared with having technology in mass production that everyone can understand and use. — Javad Ashjaee


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This article is tagged with , , , and posted in OEM, Opinions
Image: GPS World

Detecting False Signals with Automatic Gain Control

April 1, 2012

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.


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This article is tagged with , , , , , , and posted in Defense, Mobile
Credit: Ryan H. Mitch, Ryan C. Dougherty, Mark L. Psiaki, Steven P. Powell, Brady W. O’Hanlon, Jahshan A. Bhatti, and Todd E. Humphreys

Innovation: Know Your Enemy

January 1, 2012

Signal Characteristics of Civil GPS Jammers
GPS jamming is a continuing threat. A detailed understanding of how the available jammers work is necessary to judge their effectiveness and limitations. A team of researchers from Cornell University and the University of Texas at Austin reports on their analyses of the signal properties of 18 commercially available GPS jammers.


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This article is tagged with , , , , and posted in From the Magazine, Innovation, OEM
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Straight Talk on Anti-Spoofing: Securing the Future of PNT

January 1, 2012

Disruption created by intentional generation of fake GPS signals could have serious economic consequences. This article discusses how typical civil GPS receivers respond to an advanced civil GPS spoofing attack, and four techniques to counter such attacks: spread-spectrum security codes, navigation message authentication, dual-receiver correlation of military signals, and vestigial signal defense. Unfortunately, any kind of anti-spoofing, however necessary, is a tough sell.


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This article is tagged with , , , , , and posted in Defense, OEM
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Expert Advice: Test-Based Civil Receiver Certification

December 1, 2011

Disaster-preparedness plans recognize the individual’s role in his or her own survival. When storms approach, have water, food, and basic survival gear on hand. It takes time for help to arrive. The civil GPS industry faces an oncoming storm of interference, and the receiver is the first line of defense. As we integrate GPS into all facets of our lives and infrastructure, we become more subject to disruptions, both unintentional and intentional. Newark International Airport now sees several jamming events per day. In Taiwan, one airport experiences an average of 117 events per day!


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This article is tagged with , , , , and posted in OEM, Opinions
Image: GPS World

Car Jammers: Interference Analysis

October 1, 2011

Open-field tests of jamming signals from widely available in-car jammers, measured with an experimental software receiver that records the intermediate frequency (IF) samples, enable a detailed analysis of interference effects from these looming threats.


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This article is tagged with , , , and posted in Transportation
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Tamper Resistance

April 1, 2011

Modern GNSS will provide access control to the signal through spreading-code encryption and/or authentication at the navigation data level. This will require support within the receiver for secure cryptographic keys and the implementation of security functions. This article reviews vulnerabilities of these security functions, and reviews design considerations to mitigate attacks.


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This article is tagged with , , and posted in Defense, Transportation
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Spoofing Detection and Mitigation with a Moving Handheld Receiver

September 1, 2010

A single spoofing source has a different spatial signal distribution from the authentic GPS signal. An antenna array can estimate the spatial distribution of the received signal and thus discriminate the spoofing signal from the authentic one. Moving a handheld receiver with a single antenna during signal capture snapshots produces a form of a synthetic array, highly effective in discriminating spoofing signals sourced from a point-source jammer.


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