Archives

Integrity for Non-Aviation Users: Moving Away from Specific Risk

July 1, 2011 - By

Non-aviation users of satellite- and ground-based augmentation systems do not require the conservative level of integrity built into these systems for aviation users. Removing it can produce substantial benefits in terms of smaller error bounds and improved availability. read more

This article is tagged with , , , and posted in Augmentation & Assistance, Aviation, GNSS, Transportation

Lone Sentinel: Single-Receiver Sensitivity to RF Interference

July 1, 2011 - By

Using signal-to-noise measurements from a single commercial-grade L1 GPS receiver, it is possible to detect interference or jamming that is above the thermal noise floor and below a power that causes loss of position. read more

This article is tagged with and posted in GNSS, Signal Processing

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

July 1, 2011 - By

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

Letters to the Editor: LightSquared Satellite Case Skimpy

July 1, 2011 - By

Thank you for the story “LightSquared, FCC Rebuttals Distort Record” (see www.gpsworld.com/distort). One thing worth clarifying: you state, “It appears that the purpose of Lightsquared’s satellite service is, now, to provide ancillary service in remote areas not covered by the ubiquitous primary terrestrial network, or in the event that the terrestrial network is destroyed — exactly the opposite of what the FCC authorized and the GPS industry had understood and agreed to.” read more

This article is tagged with , and posted in From the Editor, Opinions

Expert Advice: Critical Offshore Applications of SBAS GNSS

July 1, 2011 - By

Precise positioning of many different kinds of vessels and other equipment depend upon satellite-based augmentation systems (SBAS) of GNSS, principally GPS and GLONASS at this time. The applications range from exploration to production and delivery of hydrocarbons to shore-based installations and navigation of very large crude carriers, or oil tankers. Decisions and recommendations are strongly needed to keep these services free from interference. read more

This article is tagged with and posted in Expert Advice & Leadership Talks, GNSS, GNSS Opinions, Opinions

Expert Advice: Energy Production Concerns about LightSquared

July 1, 2011 - By

Dear Chairman Genachowski: The National Ocean Industries Association (NOIA), which represents approximately 270 member companies involved in outer continental shelf (OCS) energy production throughout the United States, is gravely concerned over the pending allocation of Mobile Satellite Services (MSS) spectrum to LightSquared, Inc. for terrestrial high-powered transmissions. LightSquared’s proposed transmission structure will adversely impact GPS and Inmarsat signals along our coastlines, both of which are critical to marine operations. read more

This article is tagged with and posted in Expert Advice & Leadership Talks, GNSS, GNSS Opinions, Opinions