TAG: interference

Turbulence not the culprit for Northern Lights’ effect on GNSS

March 14, 2017By
Untitled-12

Researchers at the University of Bath, U.K., have gained new insights into the mechanisms of the Northern Lights, providing an opportunity to develop better satellite technology that can negate outages caused by the natural phenomenon. Previous research has shown that the natural lights of the Northern Lights — also known as Aurora Borealis — interfere with GNSS signals. Plasma turbulence within the Northern... read more

Research Online: Narrowband interference mitigation, spoofing interference classification

February 27, 2017By
Spectrum of the Adaptive Notch Filter output signal for various interference levels

Get a rundown on two GNSS presentations: one on narrowband interference mitigation and on on spoofing, jamming and multipath interference classification. read more

Innovation: Mitigating interference with a dual-polarized antenna array in a real environment

FIGURE 2. CW interference scenario.

Double Take
A diversely polarized antenna array combines signal processing in the spatial and polarization domains for significant improvement in receiver robustness against interference. The C/N0 of line-of-sight components is improved since the receiver can use the power present in the left-hand circularly polarized channels, and also interference mitigation improves. read more

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New NovAtel firmware for OEM7 offers interference toolkit, RTK Assist

February 6, 2017By

NovAtel has launched its OEM7 7.200 version firmware. Version 7.200 firmware introduces powerful new positioning functionality including the company’s Interference Toolkit (ITK). The ITK allows users to detect and mitigate intentional interference such as the adversarial jamming of GNSS signals, as well as the unintentional interference from external sources. The new RTK Assist corrections service assures continued high-accuracy positioning when signals from a... read more

Interference mitigated with CRP and dual-polarized antennas: Free webinar

January 30, 2017By
February cover story.

Two new topic areas and presentations have been added to this Thursday’s free webinar on Signal Interference: Detection and Mitigation. The speakers will explore anti-jamming protection with controlled radiation pattern antennas (CRPAs) and with dual-polarized antennas. The latter topic is also the cover story for the February issue, which demonstrated a significant improvement in positioning accuracy and robustness against interference... read more

Iridium constellation provides low-Earth orbit satnav service

January 12, 2017By

A strategic alliance announced on Dec. 15 between Orolia and Satelles includes product development and go-to-market activities of positioning, navigation and timing (PNT) solutions provided by the Iridium satellite constellation, independent of GPS/GNSS signals. The companies intend to provide PNT solutions to military, defense, government and commercial customers worldwide. Orolia, the parent of GNSS-active companies Spectracom and Spectratime, among others,... read more

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Are you experienced? Tell us about jamming, spoofing, RF interference encounters

October 11, 2016By

We talk a lot about — and publish a lot of technical articles about — GPS/GNSS jamming, spoofing and unintentional RF interference in GPS World magazine and on this website. Clearly it is an emerging and potentially huge problem. How much of it goes on right now?  Tell us very briefly (10 seconds it will take) if You are experienced... read more

This article is tagged with , , and posted in GNSS, Latest News, Uncategorized

Expert Opinions: Buyers’ need for GNSS receiver testing, certification

August 29, 2016By
Dana-Goward

Q: Buyers get little guidance as to how specific receivers react to interference, particularly in critical infrastructure. Is there a need for receiver testing and certification along the lines of Underwriters Laboratories to guide purchase and acquisition? A: Exhaustive “seven-nines” testing and verification is expensive, takes a long time and stymies innovation. Yet simple and pragmatic testing can reveal faults... read more

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