From the Magazine

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

New book explains GPS for the rest of us

February 24, 2017By
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GPS terms, its history and uses are all described in the new book GPS for Everyone: You Are Here by Pratap Misra. read more

DARPA advances on many fronts to reduce reliance on GNSS

February 13, 2017By
Micro-Technology for Positioning, Navigation, and Timing towards PNT everywhere and always; slide from a 2014 DARPA presentation to the Space-Based Positioning, Navigation and Timing National Advisory Board (Image: Robert Lutwak, DARPA Micro-Technology Office). Click to enlarge.

The U.S. Defense Advanced Research Projects Agency (DARPA) has initiatives underway with a dizzying number of technologies. read more

NASA designs antenna mounting platform for UAVs

February 13, 2017By
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Researchers at NASA’s Armstrong Flight Research Center have designed an antenna-mounting platform to provide users satellite-based tracking functions for unmanned aerial vehicles. The platform integrates multiple capabilities onto one low-cost platform. In August 2016, NASA signed a license agreement with Mobile Antenna Platform Systems Inc. to commercialize the portable antenna platform. The platform is built to rotate 60 pounds of... read more

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Agricultural robot market impacted by urbanization, less land

February 12, 2017By
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Robots are way cool. Anyone three or older knows that. And agricultural robots were among the first envisioned civilian applications of GPS. When Brad Parkinson went to Stanford in 1984, one of the earliest demonstrations he and his bright new students conducted was fully automatic GPS control of farm tractors on a rough field to an accuracy of 2 inches.... 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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Oregon moves to tablets for no-stake 3D

February 8, 2017By
ODOT inspectors Jorge Jimenez and Mike Stennett at Multnomah Falls, preparing for a night-time paving operation. (Photo: Chris Pucci)

The Oregon Department of Transportation (ODOT) is embracing the growing trend in highway construction to go “stakeless” and push to full 3D design. With more contractors using automated machine guidance applications, ODOT’s construction personnel are being asked to inspect projects with fewer stakes and visual indicators for line and grade. Employees are seeking to use the same data and information to... read more

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Tracking RFI: Interference localization using a CRPA

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A controlled radiation-pattern antenna can preserve GNSS positioning while providing at least an azimuth angle towards an interference source. If integrated with an attitude and heading reference system, only a few lines of position pointing towards the RFI source could provide a fast indication of the probable ground location. read more

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