Defense PNT Newsletter

eDLoran Surprise: European Navigation Conference 2014

May 14, 2014By
Shipboard DLORAN receiver installation (orange boxes on rails).

At the ENC-GNSS Conference in Rotterdam, we delved into actions necessary to officially use EGNOS (giving me déjà vu from WAAS’s early days), heard sage words from Brad Parkinson, the father of GPS, and, on the last day, saw amazing proof of a claim many of us initially thought was outrageous —that differential (DLoran) with modern monitoring can result in consistent horizontal accuracies approaching five meters on a moving platform. read more

The Adventure of the Atomic Clock

April 9, 2014By
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In consulting my notebooks for the spring of 2014, I find many remarkable cases that engaged the attention of my intimate friend Mr. Sherlock Holmes. The intrigue into which we were drawn by the visiting American, Geo. P. Hess, probed the unforeseen effects of a launchpad fire, the mysterious slide to the right of two system segments, and the enigma of the vanishing leaders. read more

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ANGELS, GSSAP, CNAV, and GPS: Guidance From Above

March 13, 2014By
A still from the movie Gravity, where space real estate feels really small. (credit: Warner Bros. Pictures)

Wow, what a bevy of acronyms. If you already know what they mean, great. If you don’t, just hang in and all will be made clear. E. L. Doctorow once wrote, “Writing is a socially acceptable form of schizophrenia.” Now, I am not sure how I feel about that or how my daughter who is a practicing Clinical Psychologist (PsyD) would interpret... read more

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The Gold Standard: What’s in a Name?

February 12, 2014By
Don Jewell

Our esteemed editor-in-chief and publisher at GPS World, Alan Cameron, penned an editorial in January concerning claims made by the People’s Republic of China regarding the Gold Standard for PNT (position, navigation and timing). The Chinese recently claimed that its BeiDou system averaged a user range error (URE) of 2.5 meters using zero age of data (ZAOD), 95% of the... read more

Review: Putting the Mountain-Tough Yuma 2 through Its Paces

January 8, 2014By

My original review of the first Yuma rugged tablet from Trimble MCS (Mobile Computing Solutions) was penned in August of 2011. My original plan was to have the review of the new Yuma 2 ready to go exactly two years later. But, as we all know, man plans and God laughs. Actually, the problem, I must admit, is a bit more personal in nature; you see, I have been enjoying the Yuma 2 to such a degree that it was difficult to write about it because then I have to send it back. I have been selfish too long — read on for the review of the new Trimble Yuma 2 rugged tablet computer that is perfect for fieldwork, especially fieldwork involving GPS and GIS applications. read more

Gordon’s Positioning System, Circa 1970

December 10, 2013By
800px-MonNatForest

One of my oldest and best friends died today – and he was just a kid, only 62. In the prime of his life, and yet I know he led a very full life and had no regrets when he passed on to that highway in the sky — somewhere where he will hopefully not have to ask directions, because neither one of us was very good at that. Indeed, in our youth, both Gordy and I were GPS-challenged long before GPS was a gleam in Dr. Parkinson’s eye. read more

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Ubiquitous PNT and Sequestration: The World Runs on GPS Time

November 18, 2013By

A couple of years ago, wearing a different hat, I found myself on a guided tour of a key military C2 (Command and Control center) that was about as big as a football field and was to be deployed somewhere in Southwest Asia. My colleagues and I, who are all GPS SMEs (Global Positioning System Subject Matter Experts), asked the... read more

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Decisions, Decisions: GeoGathering and ION GNSS

October 9, 2013By
Don Jewell visits the Exelis table at the GPS World Leadership Dinner.

Many may consider it a distinction without a difference, but quality matters, whether it concerns a life-changing decision or something as simple as which conference to attend. When resources are scarce, making the right decision, or sometimes just making any decision, matters — for many in our government this paradigm should reign supreme. Over the past 24 months, it seems... read more

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