From the Magazine

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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Prime Meridian on the move

January 13, 2016By
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The historical prime meridian runs through a telescope established in 1851 by Sir George Airy at the Royal Observatory at Greenwich, England. The observatory’s line in the pavement is a major tourist attraction, but the prime meridian used by satellite navigation systems is located 102 meters east of that historic location. read more

PNT Roundup: Taviga collaboration, leap second reconsidered and drone rules

January 12, 2016By
eLoran Antenna Park of 13 200-meter masts at Anthorn, UK.

eLoran New joint venture to ensure, assure secure PNT The founders of Chronos and UrsaNav have formed a new collaboration, named Taviga, that will focus on preserving and establishing low-frequency (LF) positioning, navigation and timing (PNT) networks in the United Kingdom, Europe and the U.S., using repurposed Loran-C or purpose-built eLoran technology. Taviga aims to ensure timing and navigation for... read more

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Taking Position: Women in PNT extend a hand

January 12, 2016By
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A first-time gathering at ION GNSS+ gives mentors in the GNSS field an opportunity to help newcomers. By Tracy Cozzens Managing Editor I had the privilege of attending a unique and special gathering at ION GNSS+ this past September. The meet-and-greet event was Women in PNT, sponsored by the Institute of Navigation (ION), Spirent Federal Systems and NovAtel. “The idea... read more

Launchpad: Timing antennas, UAV camera and smartwatch

January 11, 2016By
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Featuring new products in the OEM, survey, mapping and unmanned aerial vehicle sectors. read more

MEMS oscillators on the move

January 11, 2016By
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Advances in micro-electro-mechanical systems (MEMS) sensor technology include temperature-sensing MEMS oscillators (TSMO). Pairing a TSMO with a GNSS receiver, the authors successfully performed carrier-phase positioning and obtained accuracies better than typically required for automotive applications. MEMS oscillators can present space and cost advantages in integrated circuit assembly. By Bernhard M. Aumayer and Mark G. Petovello MEMS oscillators have found their... read more

Research Online: Receiver with open software interface

January 11, 2016By
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For research purposes, the GNSS Receivers with Open Software Interface (GOOSE) hardware platform provides a development chain from experimental PCIe slot card to a professional embedded GNSS receiver. The platform can be seen as a hardware-assisted software receiver where computational complex methods are implemented on digital FPGA hardware whereas algorithms can be developed and implemented on receiver side on a... read more

Out in Front: Resilient navigation and timing

January 11, 2016By
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Advocacy in the U.S. capital urges augmentation of GPS/GNSS with eLoran and other “complementary terrestrial PNT services to increase resilience.” See the Resilient Navigation and Timing Foundation’s website, rntfnd.org. This is assuredly a good thing, a worthy cause. I’ve come to believe, however, that true resilience goes beyond what we normally think of as position and timing sensors. Stimulus comes... read more