Innovation

Innovation: The Distress Alerting Satellite System

January 1, 2011By
Cospas–Sarsat system.

Taking the Search out of Search and Rescue
In 1997, a Canadian government study determined that an improved search and rescue system would be one based on medium-Earth orbit satellites, which can provide full global coverage, can determine beacon location, and would need fewer ground stations. This month’s column examines the architecture of the GPS-based Distress Alerting Satellite System and takes a look at early test results. read more

Innovation: Record, Replay, Rewind

October 1, 2010By
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Testing GNSS Receivers with Record and Playback Techniques
Is there a way to perform repeatable tests on GNSS receivers using real signals? This month’s column looks at how to use an RF vector signal analyzer to digitize and record live signals, and then play them back to a GNSS receiver with an RF vector signal generator. read more

This article is tagged with , and posted in From the Magazine, Innovation, Signal Processing

Innovation: Friendly Reflections

September 1, 2010By
Figure 4. The Oceanpal installation at Lake Laja, Chile.

Monitoring Water Level with GNSS
A receiver can selectively acquire scattered signals and the resulting measurements can be interpreted to reveal certain characteristics of the source of the scattering. This article discusses the design and application of a GNSS instrument that uses scattered signals for monitoring the level and roughness of inland and coastal water surfaces for the betterment of planet Earth. read more

This article is tagged with and posted in From the Magazine, Innovation, Remote Sensing

Innovation: Better Weather Prediction Using GPS

July 1, 2010By
Figure 3. The 21 GPS stations in the project area in the mountainous canton of Valais (see also Figure 2) used during the measurement campaign in July 2005. The stations’ altitudes vary between 527 meters (SION) and 3119 meters (ZER2).

Water Vapor Tomography in the Swiss Alps
A team of Swiss researchers is using data from a network of GPS receivers and the technique of tomography to obtain profiles of how moisture is distributed with height, which might lead to better weather forecasts. read more

This article is tagged with , and posted in From the Magazine, Innovation, Natural Resources, Remote Sensing

Innovation: GPS, GLONASS, and More

June 1, 2010By

Multiple Constellation Processing in the International GNSS Service
Does combining GPS and GLONASS observations make a difference? The International GNSS Service (IGS) has been providing such data for several years. Representatives from two IGS analysis centers discuss the past, present, and future of IGS GNSS monitoring and product development. read more

This article is tagged with and posted in From the Magazine, GLONASS, GPS Modernization, Innovation

Innovation: Accuracy versus Precision

May 1, 2010By
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A Primer on GPS Truth
True to its word origins, accuracy demands careful and thoughtful work. This article provides a close look at the differences between the precision and accuracy of GPS-determined positions, and should alleviate the confusion between the terms — making abuse of the truth perhaps less likely in the business of GPS positioning. read more

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

Innovation: GPS by the Numbers

April 1, 2010By
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A Sideways Look at How the Global Positioning System Works
In his 200th Innovation column, Contributing Editor Richard Langley takes a look at GPS by the numbers, getting a sense of how GPS works by examining the key numbers that govern its remarkable capabilities, from zero to pi and beyond. read more

This article is tagged with and posted in GNSS, Innovation

Innovation: Hybrid Positioning

March 1, 2010By
Figure 11. The electronic car used in the test.

A Prototype System for Navigation in GPS-Challenged Environments
A team of Australian and U.S. researchers have integrated a ground-based system with GPS and INS to create a hybrid system that provides precise and accurate position information continuously in a variety of environments where GPS alone comes up short. read more

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