Survey

The System: LightSquared Interference with GPS

July 1, 2011By

And the Beat Goes on Developments in the LightSquared saga came fast and furious in June; highlights are listed below and briefly recapped in the adjacent news story. It will be dated by the time you receive this issue, as it went to press three weeks prior. For current events, see Top Story and Latest News, and the full versions... read more

This article is tagged with and posted in GNSS, OEM, Survey News, The System, Transportation

On the Edge: Tracking Slips and Creeps: Earthquake Monitoring Gets Substantial Boost from GPS

July 1, 2011By
Arrow on a Velocity Field Map of Oregon and Washington represent ground motion as measured by GPS at each particular location. The grey circles are 2 sigma error ellipses (click to enlarge.)

The Earth’s surface is constantly shifting, being deformed as earthquake faults accumulate strain, and slip or slowly creep over time. Not long ago, scientists relied solely on seismometers to monitor the earth’s movements. Today, GPS has taken prominence as an indispensible tool. PANGA, the monitoring network covering the Pacific Northwest, uses GPS to monitor this movement by measuring the precise position (within 5 millimeters or less) of stations near active faults relative to each other. By determining how the stations have moved, ground deformation can be determined. read more

LightSquared: High-Precision Receivers Are Collateral Damage

June 21, 2011By

Originally, the LightSquared/GPS Technical Working Group’s (TWG) report was due to the FCC on June 15. LightSquared requested from the FCC, and received, a two-week extension to submit their report. Three days later, LightSquared announced they found a solution to the GPS interference problem. Their proposed solution is not good news for the high-precision GPS user community. read more

This article is tagged with and posted in Newsletter Editorials, Opinions, Survey, Survey Scene

LightSquared: It’s Worse than You Think

May 18, 2011By

Tired of hearing about LightSquared? Think it’s a bunch of panicking journalists hungry for something to write about? Listen, it usually takes a lot to get the hairs standing up on the back of my neck. On the LightSquared issue, they are at full attention. Why? read more

This article is tagged with and posted in Newsletter Editorials, Opinions, Survey, Survey Scene

Q&A from L5 and LightSquared Webinars

May 5, 2011By

In late March, I conducted a webinar titled "A Closer Look at L5: The Future of High-Precision GNSS," in which I discussed the impact that the new GPS L5 signal/frequency may have on high-precision users. Then, in April I was part of a discussion panel-format webinar titled "LightSquared: Our Story So Far." Many questions and comments arose from both webinars, and I'll attempt to address those in this column. read more

This article is tagged with and posted in Newsletter Editorials, Opinions, Survey, Survey Scene

Position: 20 Kilometers, Heavy Construction

May 1, 2011By
C-1a-B

The Fehmarnbelt Positioning System between Denmark and Germany includes a geodetic basis, four permanent GNSS stations, and a real-time kinematic (RTK) service for construction of a road and rail causeway between the islands of Fehmarn, Germany, and Lolland, Denmark across the Fehmarnbelt, a 20-kilometer stretch of open water in the Baltic Sea. This homogeneous, consistent, coherent, highly accurate GNSS-based positioning system exemplifies comparable systems and services that can be established for any major construction site or infrastructure project. Now in use for environmental, geotechnical, and geophysical investigations, it provides cost-efficient operations and facilitates the precise navigation of large, costly offshore equipment. read more

This article is tagged with , , , and posted in Construction, Survey

GPS Surveying/Mapping Current Events

April 6, 2011By

The first few months of 2011 have been ripe with technical challenges (LightSquared), technical innovations (Galileo/Compass), and business activity (who is Trimble buying next?). read more

This article is tagged with and posted in Newsletter Editorials, Opinions, Survey, Survey Scene

On the Edge: Making Peace: Surveyor’s GPS Device Serves as Mediator in Kenyan Land Dispute

April 1, 2011By
kenya

Early morning on February 2, 2011, I went to work in my job as a road surveyor in the Bungoma District of Kenya. Here, land disputes are common, though the government is trying to reduce the conflicts by issuing land titles and certificates. I carried with me a small handheld GPS, the Magellan Explorist 100. While I was using it, a stout man in early fifties approached me and introduced himself as a surveyor, too. He was very interested in the way I was walking around with the “gadget,” trying to locate a control point. read more

This article is tagged with , and posted in Mapping, Surveying