Opinions

Driverless future revealed at upcoming conference

February 25, 2016By
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The future rollout of the autonomous vehicle will disrupt transportation in way not seen since the automobile’s introduction. A new conference, Driverless, March 22-23 at the Crown Plaza Hotel-San Francisco Airport will explore future autonomous vehicle markets and policy; outline technological and cultural challenges... read more

World dodges GPS bullet

February 24, 2016By
The plot shows how the anomaly event impacted one GPS timing receiver during the day. (Courtesy of Chronos Technology)

It happened in the blink of an eye. Less than a blink. Far less, actually. Slightly more than one one-thousandth of an eye blink, according to calculations. In that amount of time, one of your eyelashes traverses 10 micrometers on its journey toward your lower eyelid. And yet it was long enough to throw computers and communications systems around the... read more

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Expert Opinions: Optimum number of GNSS signals for PNT device

February 22, 2016By

Q: What is the optimum number of GNSS signals to include/process in a consumer-grade PNT device? A: The cost for including additional silicon to a receiver for processing more signals is low, thanks to multiplexing hardware and high clock speeds. Having more satellite measurements allows the receiver to be selective about which ones it actually uses for PVT calculations, so... read more

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Antennas: The unsung heroes of the GNSS industry

February 22, 2016By

By Tracy Cozzens Managing Editor Antennas. When I was a kid, antennas meant the pair of rabbit ears sitting on top of the family TV set. We had to constantly adjust the angles to get the best reception, using aluminum foil to improve the signal. Wow, how things have changed. Today, consumer users of smartphones, Fitbits, smartwatches, tablets and a... read more

Out in Front: ION-ITM addresses ethics of autonomy

February 22, 2016By

The talk veered off into rather heady philosophical realms at the plenary session for ION’s International Technial Meeting in late January. Two of the three speakers had been encouraged to go well outside the box — and not to employ any equations in doing so — to address or envision the autonomously navigated future. We are caught in the act... read more

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UAV news round-up: Rules, birds and malicious drones

February 17, 2016By
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This month’s column recaps UAV news that you may or may not have picked up over the last few weeks. We start with stories related to the rules for operating drones in the U.S., then we’ll look at bird-like drones — used to scare away birds, new commercial UAV applications, and steps being taken to protect us from malicious use of drones... read more

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All Betz are on: A satnav book review

February 10, 2016By
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There is something for everyone interested in satnav in this wonderful book, regardless of their level of involvement or sophistication with PNT. This book is a treasure trove for PNT engineers and satnav experts but it’s readability is such that even if you are only slightly curious about how space based PNT works, you will find it an educational and enjoyable read. read more

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Establishing orthometric heights using GNSS — Part 5

February 3, 2016By
Figure 9. Plot depicting the changes in adjusted heights due to constraining all published NAVD 88 leveling-derived orthometric heights except for station Phaniel (using GEOID12B) .

Basic procedures and tools for ensuring GNNS-derived orthometric heights meet the project’s desired accuracy
In the latest installment of our ongoing series, the focus switches from GNSS-derived ellipsoid heights to procedures and tools for ensuring GNNS-derived orthometric heights meet the project's desired accuracy. read more

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