From the Magazine

GNSS echo sounder guides medical ship through uncharted waters

February 16, 2016By
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An Australian company that manufacturers GNSS echo sounders aided the aiders — leading a medical ship through uncharted waters in Papua New Guinea. The CEESCOPE echo sounder enabled the ship to reach volunteers who were working to save the life of a newborn. The ship, operated by YWAM Medical Ships Australia (YWAM MSA), visits remote villages in Papua New Guinea, giving... read more

Coyote howls into the wind

February 15, 2016By
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A team from the National Oceanic and Atmospheric Administration (NOAA) and Raytheon has successfully demonstrated advancements of the Coyote Unmanned Aircraft System (UAS), verifying new technology that improves Coyote’s ability to collect vital weather data on hurricanes. read more

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Innovation: Null-steering antennas

February 11, 2016By
FIGURE 1. Geometry of antenna array consisting of seven dual-frequency (L1, L2), dual polarized (RHCP, LHCP) elements arranged on a circular ground plane.

Assessing the performance of multi-antenna interference-rejection techniques
Several factors affect the levels of signal rejection using antenna arrays. Our authors describe experiments to assess the bounds the factors impose on its signal rejection capability. read more

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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

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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
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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

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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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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