Opinions

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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Seven Free Alternatives to OPUS GPS Post-Processing During U.S. Federal Government Shutdown

October 2, 2013By
NGSShutdownScreen-250

On October 1, 2013, the U.S. federal government shut down and furloughed 800,000 non-essential workers. While services considered essential remained active, those considered non-essential services, like the National Geodetic Survey’s Online Positioning User Service (OPUS), were shutdown. OPUS is a free, online GPS post-processing service. If you try to access www.ngs.noaa.gov, the following screen will be displayed: For those of... read more

Letters to the Editor

October 1, 2013By
Constellation snapshot for a specific date/time: GPS week 1749 (725) and GPS seconds 86400 = July 15, 2013, at midnight GPS Time.

Orbital Planes, Nightmares, Pioneers Good morning, Dr. Langley, I have a seven-year-old drawing of GPS satellites in their orbital planes that I found (can’t recall where) some years ago, either on a website or from a colleague who attended some GPS forum. Would you know of a site where I can find current information on GPS satellite locations, which ones... read more

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Expert Advice: Which Is the Best GNSS Receiver?

October 1, 2013By
Jaynata Ray

By Jayanta Ray Aerospace GNSS receivers constitute a class apart, compared to their more popular relatives used in automotive, cell phone, or survey applications. Automotive and cell-phone receivers can sometimes provide position information even in indoor environments. The survey class of receivers provides centimeter-level accuracies. However, neither group can guarantee the reliability and integrity of the position solution, and users... read more

Expert Advice: Get Sporty

October 1, 2013By
mountain bikers, with navigation device

By Mark Sampson In recent years, the sporting world has seen an explosion in the use of GPS. You will rarely spot a runner or cyclist on the road without either a smartphone strapped to their arm or a dedicated GPS device clamped to their handlebars, tracking their every move. The amount of information that the modern sportsperson — from... read more

Out in Front: Virtuosos

October 1, 2013By
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An occasional reader of these pages forwarded a clipping from a summer Wall Street Journal, a book review of the new title, Curiosity: How Science Became Interested in Everything, by Philip Ball (University of Chicago Press, 465 pages, $35). The book covers scientific advances logged in the 1600s, a century that “began with an essentially medieval outlook and ended looking... read more

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New GLONASS Navigation Message Proposed

September 30, 2013By

Russian scientists and engineers are at work on a new code-division multiple-access signal format to be broadcast on a new GLONASS L3 signal. Taking an approach similar to that implemented on the newly designed GPS L5 signal, this will, once implemented across the constellation by new satellite launches, facilitate interoperability with and even eventually interchangeability among other GNSS signals, including... read more

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Watershed Moment Approaching for the Connected Vehicle

September 25, 2013By
Connected vehicles can help to mitigate crashes on busy urban streets.

A watershed moment may be approaching for the connected vehicle market. The National Highway Traffic and Safety Administration (NHTSA) is about to start on the path towards mandating connected vehicle technology. Interest in the market is not limited to a few countries; last week I moderated a GPS World webinar on the connected vehicle that drew registrants from 40 countries.... read more

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