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TAG: surveillance

Image: GPS World

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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Image: GPS World

North Korea Jamming Incident; LightSquared Issue

September 14, 2011

My mailbox is currently overflowing with comments and questions concerning rampant rumors that in the March 2011 time frame a U.S. military reconnaissance aircraft was forced to land during an annual major east Asian military exercise, known as Key Resolve, due to GPS jamming. The jamming reportedly took place along the northern portion of the 684-mile long Korean peninsula, with the jamming supposedly originating with the North Koreans. The jamming scenario should come as no surprise, but it is the emergency or forced landing due to loss of a GPS signal among other supposed “facts” with which I take issue.


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

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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Image: GPS World

Assessing the Spoofing Threat

January 1, 2009

A portable spoofer implemented on a digital signal processor mounts a spoofing attack, characterizes spoofing effects, and suggests possible defense tactics. GNSS users and receiver manufacturers should explore and implement authentication methods against sophisticated spoofing attacks.


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This article is tagged with , , , , and posted in Defense
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A view from the location of an unintentional GPS jammer across Moss Landing Harbor to the Monterey Bay Aquarium Research Institute. A GPS receiver with its antenna on the other side of the roof was continuously jammed for months.

The Hunt for RFI: Unjamming a Coast Harbor

January 1, 2003

A team of engineers tracked down three rogue television antennas guilty of jamming GPS for months.


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