From the Magazine

Antenna Array and Receiver Testing with a Multi-RF Output GNSS Simulator

March 6, 2015By
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This article discusses the GALANT adaptively steered antenna array and receiver, demonstrating the test scenarios generated with the GNSS simulator. Exemplary results of different static and dynamic test scenarios are presented, validating the attitude determination capabilities as well as the interference detection and mitigation capabilities. read more

Innovation: Where Are We?

March 5, 2015By
FIGURE 4. Trajectory solutions.

Positioning in Challenging Environments Using Ultra-Wideband Sensor Networks
The use of large transmission bandwidths offers a number of benefits, including accurate ranging and that application in particular is being actively developed for positioning and navigation in environments that are challenging to GNSS such as indoors and built-up areas. In this month’s column, we take a look at the work being carried out in this area by a team of researchers at The Ohio State University. read more

GPS World Simulator Buyers Guide

March 3, 2015By
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The GPS World Simulator Buyers Guide, from the March 2015 issue, features the latest simulators from seven top companies. read more

On the Edge: The Precision to Carry On

March 1, 2015By
Components easily pack into a baseball-style case.

When asked to do a small survey job overseas, we were concerned about shipping bulky and expensive survey equipment. Shipping costs are not trivial. Add to that the real possibility that your survey equipment may be confiscated by the local authorities, as ours was in Djibouti, and the cost of shipping equipment becomes a substantial part of the overall job. There should be alternatives, especially if accuracy requirements are not stringent. read more

The Business — March 2015

March 1, 2015By

The Business section from the March 2015 issue. Download the PDF. Includes: Harris to Acquire Exelis GATE Facility Recertified Spectracom Offers RTK System Testing PlanetiQ Plans GNSS Weather Constellation Briefs   read more

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The System: Leap-Second Confusion

March 1, 2015By

The United States Civil GPS Service Interface Committee (CGSIC) has issued a notice about a problem some receivers are having implementing the correct time. The U.S. Coast Guard Navigation Center has received reports of synchronization issues since the implementation of a leap second on Jan. 21. Users experiencing this problem should contact the receiver manufacturer for a firmware or software... read more

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Innovation: Python GNSS Receiver

February 1, 2015By
FIGURE 8. The trip back to Puno as determined by Receiver Y after cooperative scalar tracking and navigation computations. Compared to Figure 4, the navigation solutions are less noisy. Image courtesy of Google Earth and the GPS Visualizer.

An Object-Oriented Software Platform Suitable for Multiple Receivers
An experiment highlights the abilities of the Python Receiver, showing how it has been used to develop a software-defined GNSS receiver — one well-suited to processing data from a network of receiver front ends. read more

Global Asset Management, 11 Years On

February 1, 2015By

Over a decade ago GPS World covered the introduction of the first battery-powered asset tracking device that operated over satellite networks, the AXTracker (“Going the Distance,” October 2003). More than ten years later, the technology has proven the market, and opened new markets. read more