TAG: jamming

South Korea to build eLoran system after jamming incident

May 3, 2016By
SouthKorea-Seoul

South Korea will award a contract this month to secure technology required to build an eLoran system as an alternative to GPS, reports the Australian Broadcasting Company (ABC). The announcement follows South Korea pointing the finger at North Korea for jamming its GPS signal reception in late March. The South Korean eLoran plan envisions setting up coastal transmitters by the end... read more

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GNSS has bad days, too

April 27, 2016By
(courtesy Ursanav)

“Even the best technology has a bad day,” Charles Schue told the New York Stock Exchange (NYSE), which relies very heavily on the best technology to keep the world’s financial edifice afloat. Vulnerabilities in the stock market were pointed up during a demonstration on April 19, showcasing how one positioning, navigation and timing (PNT) system can cover the chinks in... read more

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State Department issues notice on North Korean jamming

April 8, 2016By

On April 7, the U.S. Department of State issued a notice about the recent jamming experienced in South Korea. Korean Peninsula GPS Jamming Notice A continuing series of incidents have been reported in the general location of Incheon, Republic of Korea and the surrounding Gyeonggi and Gangwon provinces out to approximately 100 nautical miles beginning on or about 0000Z31March16. The... read more

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South Korea issues warning over suspected North Korean GPS disruption

March 31, 2016By
SouthKorea-Seoul

South Korea issued a warning Thursday after detecting satellite signal disruptions that appeared to be coming from North Korea, according to the Korea Herald. The capital city of Seoul appeared to be the target. Officials said North Korea discharged a large amount of radio waves to jam GPS signals in the region. “We’ve detected signs that North Korea has been... read more

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GPS recruits: Uncle Sam wants your ideas!

January 27, 2016By
Uncle_Sam_(pointing_finger)

The GPS modernization funding picture cannot be called bright, yet neither can it be characterized as dim. While big money for big projects appears hard to come by, the U.S. government and military offer many smaller allocations to help fill the chinks in GPS armor. Such initiatives concern jamming, PNT solutions in GPS-denied environments and other conundrums. A run of... read more

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US Coast Guard issues GPS jamming alert

January 23, 2016By

The U.S. Coast Guard issued a safety alert on Jan. 16, warning mariners of the potential detrimental impact to navigation caused by GPS interference or jamming. The warning emphasizes the importance of understanding how vessel equipment could be impacted by the loss of a GPS signal. The Coast Guard states that this past summer, multiple outbound vessels from a non-U.S.... read more

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Combat jamming with adaptive notch filtering or wavelet mitigation: a comparison

January 14, 2016By
Power Spectral Density comparison (fs=112 MHz; fif=28.42 MHz; Bif=30 MHz).

Wavelet Packet Decomposition (WPD) shows promise as an anti-jamming tool. The WPD is derived from the wavelet transform, which provides a representation of the signal components in a domain spanned by a set of functions that can be seen as band-pass filters with a bandwidth decreasing as their central frequency increases, thus granting a uniform resolution in the decomposition of... read more

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PNTAB and eLoran in the People’s Republic

November 11, 2015By
Boulder Colorado Flatirons. (Courtesy of Wikipedia)

That is, in the People’s Republic of Boulder, Colorado. To those of us who live in Colorado, Boulder is known by this seemingly timeless but absolutely accurate appellation. This stunningly beautiful city located in the foothills of the Rocky Mountains, known as the Flatirons, is where the National Space-Based Positioning, Navigation and Timing Advisory Board (PNTAB), which provides independent advice to... read more

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