TAG: real-time kinematic

Centimeter-Level RTK Accuracy More and More Available — for Less and Less

February 4, 2014By
Eric Gakstatter

Last month, I started off 2014 with a bang by listing all the public RTK bases available in the United States, most of them being free. I received a lot of positive feedback and some enlightenment. For example, I didn’t know that in California, there are more than 330 RTK public base stations accessible by anyone for free via the... read more

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

Finally, A List of Public RTK Base Stations in the U.S.

January 7, 2014By

First of all, let me wish a Happy New Year to all my friends around the world and a prosperous 2014. I’m as excited as I’ve ever been about GNSS technology. If I may ask for forgiveness from you if you live outside of the United States, I’d like to start out answering a question I’ve been asked about for... read more

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Network RTK for Intelligent Vehicles

February 1, 2013By
opener

Adoption of network real-time kinematic GNSS positioning can lead to major improvements in vehicle localization, although implementation must overcome some real-world challenges. This article assesses the extent of GNSS signal outage in a motorway environment. The average total GNSS outage period and the average time to resolve ambiguity for the network RTK solution can help assess complimentary sensors for a ubiquitous positioning system. read more

This article is tagged with , and posted in From the Magazine, Road

Innovation: Doppler-Aided Positioning

May 1, 2011By
Figure 1. Satellite tracking and carrier-phase anomaly summary during the observation time-span. These data were collected in a dense urban environment in both static and kinematic mode. The superimposed red-points show epochs where carrier-phase observables are either missing or contaminated with cycle slips, loss of locks, and/or other measurement anomalies.

Improving Single-Frequency RTK in the Urban Enviornment
A look at how Doppler measurements can be used to smooth noisy code-based pseudoranges to improve the precision of autonomous positioning as well as to improve the availability of single-frequency real-time kinematic positioning, especially in urban environments. read more

This article is tagged with , and posted in Algorithms & Methods, From the Magazine, Innovation

Road Talk: Interoperability Considerations for V2X GNSS Receivers

March 1, 2011By
streetScene-W

The presence of different types of devices, spanning multiple GNSS receiver types, configurations, hardware, software, and consequent widely varying capabilites, among a user mix of vehicles, cyclists, and pedestrians, poses several engineering challenges for a V2X scheme in which all road users share data with each other and with the road infrastructure. read more

This article is tagged with , , and posted in Road

On the Edge: Lost Graves, Trail of Tears

March 27, 2010By
OnEdge-MapSlice

During the winter of 1838–39, the great Native American Cherokee Nation trekked across southern Illinois, in a forced removal by the U.S. government from their ancestral homeland in Tennessee. Harried, unequipped, and unsupported by their captors, thousands died on the Trail of Tears. Burial records were not kept, and burial locations remain lost to this day. Local history suggests that some Illinois settlers allowed the Cherokee to bury their dead on small plots of land adjacent to their own family cemeteries. One such plot, the Campground Presbyterian Church cemetery near Anna, Illinois, may contain unmarked Cherokee graves. read more