![]() stations with data communications failures over 2 weeks.stations losing data (power failures, antenna failures, etc.).non-operational stations with high scientific value.However, the following guidelines were used by PBO field engineers to prioritize GPS maintenance activities: ![]() There was no set timeline for repairing non-operational stations. This was done to minimize the travel costs associated with station visits. Maintenance activities were scheduled to include a number of stations during one maintenance trip. The GPS Operations Manager coordinated the maintenance with the field engineers who were based in locations throughout the Western U.S. Scheduled and unscheduled maintenance were combined where appropriate to reduce travel costs. Field engineers also performed scheduled maintenance on the equipment, such as battery replacement which was done every five years. On-site maintenance included repairs due to hardware malfunctions, lightning strikes, vandalism, theft, or other unanticipated problems. Office-based maintenance included activities such as receiver firmware upgrades and configuration changes. UNAVCO provided both remote (office-based) and on-site maintenance for the PBO network. At any given time, at least 85% of the GPS stations in this network needed to be operational. UNAVCO had the mandate to ensure that the PBO GPS Network was operated with a high level of performance and reliability. ![]() Finally, PBO installed five long-baseline surface laser strainmeters (LSM) and took over the operation and maintenance of one legacy station that was built to similar specification, the six LSMs now making up the PBO LSM Network. Additionally, there were 74 borehole strainmeters (BSM) and 78 short-period borehole seismometers comprising the PBO BSM Network and the PBO Borehole Seismic Network, respectively. The PBO project had 891 permanent and continuously operating GPS stations and integrated 209 PBO Nucleus stations, which were previously part of legacy GPS networks, the total making up the current 1100 station PBO GPS Network. NOTA Operations & Maintenance - GAGE Facility activity, operated by UNAVCO Inc., Oct 2018 - Sep 2023.PBO Operations & Maintenance - Phase 2 as a GAGE Facility activity, operated by UNAVCO Inc., Oct 2013 - Sep 2018.PBO Operations & Maintenance - Phase 1, Oct 2008 - Sep 2013.PBO Construction (MREFC), Oct 2003 - Sep 2008.Probing of surface conditions through GPS reflectrometry (i.e., satellite to surface to receiver pathways) to measure soil moisture, snow depth, vegetation moisture index, and other features, provides crucial information regarding the water cycle and water resources.Īdvances in satellite systems through the Global Navigation Satellite System (GNSS) and innovations in GNSS/GPS receivers, other instrumentation, data processing, computing power, and cyberinfrastructure allowed the scientific community to better address an array of critical scientific and societal problems using space and terrestrial geodetic techniques in geographically distributed areas.įor more information about the science goals of PBO, please visit EarthScope Science. Sounding of the atmosphere through GPS (i.e., satellite to receiver pathways) to measure total electron content in the ionosphere and precipitable water vapor in the troposphere impacts research regarding space weather, severe weather, and atmospheric dynamics. ![]() ScienceĪ primary objective of the PBO was quantify three-dimensional deformation and its temporal variability across the active boundary zone between the Pacific and North American plates.Ĭentimeter to millimeter-level measurements of surface and near surface motion through Global Positioning System (GPS) stations, borehole geophysics, long-baseline laser strainmeters, accelerometers, and geodetic imaging has far reaching implications regarding earthquakes, volcanic unrest, subsidence, landslides, extraction or injection of fluids, loading or unloading of water, ice or snow, and other Earth processes. Michael Jackson, and the current Director of UNAVCO Geodetic Infrastructure, Dr. Principal Investigators (PI) for the Plate Boundary Observatory have included, former UNAVCO Presidents, Dr. UNAVCO was responsible for design, instrument installation, ongoing maintenance, communications, data archiving, data processing, and data availability for the geodetic instruments that comprised the Plate Boundary Observatory. The Network of the Americas (NOTA) is a federated network comprised of stations that were part of the the former EarthScope PBO, COCONet, TLALOCNet networks. The Plate Boundary Observatory (PBO) component of the NSF EarthScope program precisely measured Earth deformation resulting from the constant motion of the Pacific and North American tectonic plates in the western United States. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |