TAG: jamming

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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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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Orolia fortifies resilient PNT with Satelles satellite time and location signal

December 15, 2016By
Iridium satellite, courtesy of Iridium.

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

Poll: Experiences with jamming, spoofing and RF interference

November 14, 2016By
jimi-purple-haze

Not with Purple Haze, but with signal interference — although, come to think of it, the two may be not unalike, phenomenologically. The October reader’s poll asked “Have you directly experienced any of the following? Check all that apply. GPS/GNSS jamming. GPS/GNSS spoofing. Unintentional RF interference. RF interference from unknown source; unknown whether intentional or not. None of the above.... read more

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

Expert Opinions: Testing and simulating against GNSS jamming, spoofing

November 8, 2016By
satellites-500x150

Q: What special considerations should be taken into account for testing and simulating against GNSS jamming and spoofing?   A: Current integrations of GPS include a controlled reception pattern antenna (CRPA). Testing with a standard interference or jamming source will not provide accurate results. Wavefront generator simulators are capable of outputting signals that correctly stimulate the GPS receiver’s antenna electronics.... read more

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Make it real: Developing a test framework for PNT systems and devices

OPENING GRAPHIC

Tests of the robustness of commercial GNSS devices against threats show that different receivers behave differently in the presence of the same threat vectors. A risk-assessment framework for PNT systems can gauge real-world threat vectors, then the most appropriate and cost-effective mitigation can be selected. Vulnerabilities of GNSS positioning, navigation and timing are a consequence of the signals’ very low... read more

Canada, US workshops focus on PNT threats

October 26, 2016By
highprecision-gps-l1-receiver-category

Two workshops convened in recent weeks in the U.S. and Canadian capitals, respectively, sought to bring into focus looming threats to the nations’ positioning, navigation and timing capabilities and critical infrastructures. Some of the threats are pervasive — jamming and spoofing — and formed the general topic of the Canadian workshop. Some threats are specific — powerful terrestrial transmitters overwhelming... read more