Columns and Editorials

Network RTK and Reference Station Configuration

Network RTK and Reference Station Configuration

Q: What effect does network size have on NRTK positioning?

A: Network real-time kinematic (NRTK) positioning is nowadays a very common practice, not only in academia but also in the professional world. In the last 10 years, several networks of continuous operating reference stations (CORSs) were created to support users. These networks offer real-time services for NRTK positioning, providing centimeter-level positioning accuracy with an average distance of 25–35 kilometers between the reference stations.

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By Inside GNSS
LightSquared: Who Pays for GPS Receiver Fixes Yet to be Devised?

LightSquared: Who Pays for GPS Receiver Fixes Yet to be Devised?

With more testing on the horizon and a potentially alarming homeland security report about to be released, LightSquared’s efforts to begin work on its proposed wireless broadband service are stuck in the procedural mud.

The delays, which are never good for a commercial company, are piling up just as the firm’s coffers are thinning and need to be replenished with a new round of fund raising.

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By Dee Ann Divis
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GNSS Hotspots | September 2011
September 14, 2011

GNSS Hotspots | September 2011

1. HERE, KITTY KITTY
Santa Cruz, California USA
√ First, get the cougar on the treadmill . . . that’s what UC Santa Cruz researchers did to measure baseline behavior and design a tool that tells what puma concolor do every minute. Their super-advanced CARNIVORE collar uses GNSS and a 3-axis accelerometer to create a 24-hour diary of the wild life.

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By Inside GNSS
Worst GPS President Ever?
September 13, 2011

Worst GPS President Ever?

First, let’s review the record of presidential leadership in GPS.

In 1983, following the shooting down of an errant Korean airliner over Soviet airspace, President Ronald Reagan ordered the U.S. Air Force to make GPS available for civilian use so that such navigational errors could be avoided in the future.

George H. W. Bush was commander in chief in 1991 during the first Persian Gulf when GPS helped coalition troops throw the so-called “left hook” by navigating through the desert around entrenched Iraqi troops in Kuwait.

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By Inside GNSS
The Differences in Differencing

The Differences in Differencing

Q: How does measurement differencing affect my computed position?

A: The short answer is, “That depends.”

Standalone, or undifferenced, measurements obviously produce the poorest positioning performance. However, how we proceed from this most basic data processing approach may affect the computed solution. In this article, we look at the details of why this occurs.

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By Inside GNSS
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The Fire Next Time
July 26, 2011

The Fire Next Time

What have we learned from the LightSquared fiasco?

Aside from the fact that someone gambling with other people’s money, with friends in high places benefiting from his largesse, can make the law stand on its head and our hair stand on end.

But then, we already knew that.

Just because the forces behind the broadband cellular company, Philip Falcone and Harbinger Investments, made their money by betting against the housing bubble doesn’t take away from the fact that they represent the same crew who helped take down the world economy in 2007.

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By Inside GNSS
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