TAG: mitigation

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

Expert Opinions: OEM R&D budget for mitigation of jamming

August 8, 2016By

Q: What percent of a GNSS designer or manufacturer’s R&D budget should be devoted to mitigation of jamming? A: Solving for jamming, intentional or unintentional, in the design of any GNSS technology platform is no longer an option. How much any one company spends is largely a function of how much is spent on engineering overall and of how much... 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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Solar Burst Impacts GPS

April 27, 2007By

On December 6 last year, the sun emitted a burst of radio energy that impacted the performance of GPS receivers all over the sunlit side of the Earth. That the sun produces radio emissions is not surprising. What is surprising is that on this day they were extremely powerful. read more

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