From the Magazine

Antenna pilots UAV

February 11, 2016By
perkins_opener-O

A jammer-hunting UAV employs a radio frequency (RF) detection system and a navigation control scheme. The RF detection component uses a directional antenna and the unmanned aerial vehicle’s (UAV’s) ability to rotate to determine a bearing to the jammer. The navigation control scheme selects a trajectory for making bearing measurements that enable rapid jammer localization, based on three bearing calculation methods:... read more

This article is tagged with and posted in Featured Stories, From the Magazine, UAV/UGV

System of Systems: GPS III bidding, testing

February 9, 2016By
IRNSS 1D in earlier lab testing.

GPS III Bidding Opens — Again The GPS Directorate at the Space and Missile Systems Center (SMC) continues to look for someone to build 22 GPS III satellites in the near future. SMC issued a request for proposals on Jan. 8, with rather complicated terms. The first eight GPS III satellites are already under contract, and two have been built,... read more

Launchpad: Mapping book, anti-drone system

February 9, 2016By
i80-gnss-receiver-CHC-navigation

The i80 GNSS receiver computes a true triple-frequency real-time kinematic (RTK) tilted pole solution using all four worldwide and multiple regional constellations, providing a future-proof sub-centimeter RTK solution to surveyors and contractors. read more

This article is tagged with and posted in From the Magazine, Mapping, OEM, Product Showcase, Survey, UAV/UGV

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
Meridian-O

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
amazon-prime-drone-4

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