Global Navigation Satellite Systems Engineering, Policy, and Design
Equations 1 – 11Q: How does a GNSS receiver estimate velocity?
A: Stand-alone single-frequency GNSS receivers represent the largest slice of the commercial positioning market. Such receivers operate mainly in single point position (SPP) mode and estimate velocity either by differencing two consecutive positions (i.e., approximating the derivative of user position) or by using Doppler measurements related to user-satellite motion.
By Inside GNSS
Carlo des Dorides, El?bieta Bie?kowskaLast January, the European GNSS Agency (GSA) announced a new invitation to tender for the role of Galileo service operator (GSOp). Speaking at the recent EU Space Policy Conference in Brussels, GSA Executive Director Carlo des Dorides called it the largest contract ever to be awarded under the Galileo program.
“It will shape the future of Galileo,” he said.
By Peter Gutierrez
Prof. David LastThe U.S. government appears to be closing in on a decision about whether to revive plans for an enhanced Loran (eLoran) system, as a backup for the position, navigation, and timing (PNT) information provided by GPS signals.
By Dee Ann Divis
GPS+EGNOS tracking device able to use EGNOS OS and EDAS mounted on a containerThe European Geostationary Navigation Overlay Service (EGNOS) has a European regional coverage that could be extended quite easily to areas adjacent to the European Union. Backed by the European Commission, a public/private consortium is operating programs of technical assistance to prepare nations in the Mediterranean region to adopt and exploit European GNSS services in their priority market segments, namely aviation and road freight transport/logistics.
By Inside GNSS
The European Space Agency (ESA) announced today (March 13, 2015) that the second Galileo full operational capability (FOC) satellite launched into the wrong orbit last August has now entered its corrected target orbit, which will allow detailed testing to assess the performance of its navigation payload.
By Inside GNSS
David Madden, Space and Missile Systems Center executive director. U.S. Air Force photoThe Air Force is working on a creative acquisition strategy to ensure there is a vigorous competition to build the next tranche of GPS III satellites, says a key acquisition official.
By Inside GNSS
Rohde & Schwarz CMW500 wideband radio communications testerRohde & Schwarz is offering a standard compliant test solution for manufacturers and suppliers of automatic Russia’s new ERA-GLONASS in-vehicle emergency call systems.
Arlington, VirginiaNOAA’s National Geodetic Survey (NGS) Geospatial Summit will be held at the Crystal City Hilton in Arlington, Virginia on April 13-14, 2015.
Registration is now open. Early registration ends March 13, 2015.
NGS will be hosting three events, each one providing a venue for NGS to share information about its products and services as well as hear from its customers across the public and private sectors.
By Inside GNSS
Chris Blackford of Sky-Futures speaking at AUVSI’s Unmanned Systems Europe 2015. Peter Gutierrez photoJust as you do when you get in your car, the UAS, UAV, drone, RPAS and even ROAV communities — who probably need to agree on an acronym — are beginning to take GNSS for granted. But presenters at the AUVSI Unmanned Systems Europe 2015 conference held Tuesday and Wednesday (March 3–4, 2015) in Brussels had little to say on the subject, to our great disappointment, even though virtually all of the vehicle/vessel systems under discussion use it and need it.
By Inside GNSS
The Indian Space Research Organization (ISRO) has postponed launch of the fourth Indian Regional Navigation Satellite System spacecraft (IRNSS-1D), originally scheduled for March 9, due to an anomaly. During integrated electrical checks of the PSLV-C27 launch vehicle and IRNSS-1D after the closure of heat shield on March 3, an anomaly was observed in one of the telemetry transmitters of the satellite.
By Inside GNSS
Vancouver, Canada–based Rx Networks Inc., announced the upcoming release of its GPStream PGPS v8 extended ephemeris solution yesterday (March 2, 2015) at the Mobile World Congress in Barcelona, Spain.
By Inside GNSS
Airservices Australia graphicAirservices Australia and Inmarsat announced yesterday (March 1, 2015) that they would lead trials of a GNSS-aided aircraft tracking system to improve surveillance of aircraft over ocean regions.
By Inside GNSS
Graph showing the difference between UT1 and UTC. Vertical segments correspond to leap seconds. Source: Wikimedia CommonsDifferences between BeiDou and GPS and Galileo in designation of a “day number” for the date of applying leap second later this year could cause problems for GNSS receiver manufacturers, according to UK-based simulator provider Racelogic.
By Inside GNSS
