Support for Existing Western U.S. GPS Networks

支持美国西部现有 GPS 网络

• 批准号: 0318549
• 负责人: William Prescott
• 金额: $ 278.23万
• 依托单位: UNAVCO, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-15 至 2006-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0318549&HistoricalAwards=false
• 关键词: Support; Existing; Western; U.S.; GPS

0318549PrescottThis grant support the the ongoing operation and maintenance of 255 continuously operated global positioning system receivers (CGPS) that are a subset of 470 CGPS stations currently operational in the western U.S and one laser strainmeter system for a period of eighteen months. Through UNAVCO, Inc. governance, the geodetic/geophysics community selected 255 CGPS stations that are part of six heretofore independent regional GPS networks whose development and operational costs have been previously supported through multiple sources including NSF, NASA, NOAA, USGS and the Keck Foundation. Stations now a part of the Southern California Integrated Geodetic Network (SGICN), the Bay Area Regional Deformation Network (BARD), the Basin and Range Geodetic Network (BARGEN), the Eastern Basin and Range-Yellowstone GPS network (EBRY), the Pacific Northwest Geodetic Array (PANGA), and the Alaska Deformation Array (AKDA) will be operated and maintained as a coherent unit, with oversight management, equipment replacement coordination and engineering assistance from UNAVCO, Inc. facility and headquarters employees and additional efforts by regional network scientists and engineers through subcontracts to the University of Southern California (SCIGN), UC-Berkeley (BARD), Caltech (BARGEN), Smithsonian Astrophysical Observatory (BARGEN), University of Utah (EBRY), Central Washington University (PANGA), and the University of Alaska (AKDA).A primary goal of this project is to provide for the ultimate integration of CGPS receivers in the above listed western U.S. regional GPS networks into the Plate Boundary Observatory (PBO) component of EarthScope. The design goals of PBO include: 1) the operation of 875 CGPS stations consisting of a backbone array of CGPS receivers with approximate 200 km spacing extending along the western margin of North America from Mexico to Alaska and from the west coast of the U.S. eastward to the Rocky Mountain Plateau and additional denser clusters of CGPS receivers proximal to selected volcanic and fault structures; 2) an array of 175 distributed borehole strainmeters, and; 3) five long baseline laser strainmeters. This proposal provides temporary funding for operations and maintenance support for currently operating GPS stations in the western U.S. that may ultimately become part of the PBO backbone and supported through the NSF/MREFC EarthScope operations and maintenance budget five years hence A lengthening of the available core PBO CGPS time series is intended to serve the broader instrumentation system related goals of EarthScope/PBO to: 1) detect and understand transient deformation process on timescales from days to decades; 2) constrain uncertainties which can plague precise observation of the vertical deformation field observed by CGPS receivers and thereby allow for discrimination between various geophysical models of solid earth deformation, and; 3) enhance our understanding of the various low frequency noise sources that can preclude GPS observation of the most subtle tectonic signals.***

这笔赠款支持255个连续运行的全球定位系统接收器(CGPS)的持续运营和维护，这些接收器是目前在美国西部运行的470个CGPS站的子集，以及一个激光应变计系统，为期18个月。通过UNAVCO公司的治理，大地测量界/地球物理界选择了255个CGPS站，这些站是迄今独立的六个区域GPS网络的一部分，这些网络的开发和业务费用以前由包括国家科学基金会、美国国家航空航天局、美国国家海洋和大气局、美国地质勘探局和凯克基金会在内的多个来源提供支助。现在属于南加州综合大地网(SGICN)、湾区区域形变网(BARD)、盆地和山脉大地网(BARGen)、东部盆地和山脉-黄石GPS网(EBRY)、太平洋西北大地阵(PANGA)和阿拉斯加形变阵(AKDA)的站将作为一个连贯的单元进行操作和维护，来自UNAVCO、Inc.设施和总部员工的监督管理、设备更换协调和工程协助，以及区域网络科学家和工程师通过分包给南加州大学(SCIGN)、加州大学伯克利分校(BARD)、加州理工学院(BARGN)、该项目的一个主要目标是将上述美国西部区域GPS网络中的CGPS接收器最终集成到EarthScope的板块边界观测站(PBO)组件中。PBO的设计目标包括：1)运行875个CGPS观测站，其中包括一个主干CGPS接收器阵列，其间距约为200公里，沿北美西部边缘从墨西哥延伸到阿拉斯加，从美国西海岸向东延伸到落基山脉高原，并在选定的火山和断层构造附近增加密度更高的CGPS接收器群；2)175个分布式钻孔应变仪阵列；3)5个长基线激光应变计。这项提议为美国西部目前运行的GPS站的运行和维护支持提供临时资金，这些站最终可能成为PBO主干的一部分，并在五年后通过NSF/MREFC EarthScope运行和维护预算提供支持。现有核心PBO CGPS时间序列的加长旨在服务于与EarthScope/PBO更广泛的仪器系统相关目标：1)探测和了解从几天到几十年的时间尺度上的瞬时变形过程；2)限制不确定性，这些不确定性可能困扰CGPS接收器观测的垂直变形场的精确观测，从而允许区分固体地球变形的各种地球物理模型；3)加强我们对各种低频噪声源的了解，这些噪声源可能会妨碍GPS观测最细微的构造信号。*