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Expanding Real-Time GPS Network for Sustaining and Enhancing Positioning Applications

Explore the proposal and business plan for expanding the real-time GPS network to sustain and enhance statewide positioning applications. Consider forming a consortium of users and data providers to cover costs and ensure the network's success.

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Expanding Real-Time GPS Network for Sustaining and Enhancing Positioning Applications

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  1. Sustaining HPWREN – Consider CRTN Model Yehuda Bock Scripps Institution of Oceanography Director, SOPAC, CSRC 2009 HPWREN Annual Meeting Palomar Observatory November 5, 2009

  2. California Real Time Network • ~130 stations in California, operated by SOPAC, USGS, PBO, Orange County, San Diego County, MWD, NCEDC as prototype for early warning system and real-time positioning applications • 1 Hz (once per second) raw GPS data streamed over dedicated radio links, microwave towers, and cell modems with a latency of a fraction of a second to server at SIO • ~50% of stations use HPWREN Real Time (Active) Real Time (temp. down) Upgrade in Progress (http://sopac.ucsd.edu/projects/realtime/)

  3. CRTN Consortium • We need a way to expand GPS real-time network statewide and to cover the cost of operations at SOPAC/CSRC (necessitated due to recent drastic reduction in Federal funding to CSRC from NOAA/NOS/NGS) • Developed a CRTN Proposal and Business Plan to form consortium of users and data providers, including membership fees and CRTN Board membership • Held inaugural meeting of Consortium in October • Consortium members will enter into service agreements with SOPAC • Success in not guaranteed, especially in this economic environment • HPWREN should consider a modified version of this approach to sustain itself and perhaps expand coverage

  4. CRTN Proposal, 10/16/08 CRTN Business Plan, 7/15/09 Proposal: http://csrc.ucsd.edu/input/csrc/proposals/CRTNProposal_version5.0.pdf Business Plan: http://csrc.ucsd.edu/input/csrc/proposals/CRTN_BusinessPlan_09July.pdf

  5. CRTN Expansion Areas • DWR, NOAA and SIO project for GPS meteorology and flooding early warning system • With PBO, establish statewide base network at ~50 km spacing • With Caltrans, to cover the Central Valley for positioning applications • Cascadia region with ARRA funding through NSF (UNAVCO/PBO)

  6. Single-Base User Positioning Service User Troposphere Delays Consortium Member 1 Hz Displacements Variety of CRTN Uses CGPS Network Data Models CRTN Server Data • NSRS/CSRS Coordinates • Ultra-rapid SOPAC Orbits • NOAATrop Model • Ionosphere Model • Crustal Motion Model • Geoid Model RTD Server,SOPAC Database, Web Services, GPS Explorer SOPAC Utilities Communications GPS Station multiple data streams CSRC NMEA (CSRS) RTCM Earthquake Early Warning RTCM (CSRS) Flood Early Warning Spatial Referencing

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