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OPUS Online Positioning User Service Status & Future Prospects

OPUS Online Positioning User Service Status & Future Prospects. Neil Weston NGS Convocation, 2005 Silver Spring, MD. OPUS – Current Status. Accepts GPS Data in Native receiver format RINEX format (versions 2.0 & 2.1) Data Processing Uses three CORS stations

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OPUS Online Positioning User Service Status & Future Prospects

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  1. OPUS Online Positioning User Service Status & Future Prospects Neil Weston NGS Convocation, 2005 Silver Spring, MD

  2. OPUS – Current Status • Accepts GPS Data in • Native receiver format • RINEX format (versions 2.0 & 2.1) • Data Processing • Uses three CORS stations • Minimum of two hours of dual-frequency data • Provides • NAD83 & ITRF coordinates • State plane coordinates • UTM coordinates • US National grid designator • G-file, statistics, etc.

  3. OPUS Performance • Solution returned within a few minutes • Almost 12,000 solutions processed per month • Over 13,000 users

  4. OPUS Developments • OPUS Database (OPUS-DB) • Stream-lined method for users to publish their results • User registration • ID & password • Validation process • OPUS solutions can be integrated into the NGS database • Data elements from OPUS • Additional metadata (Photos, descriptions) • Submission review by user and NGS

  5. OPUS Rapid Static (OPUS-RS) • Rapid static solutions (10 – 15 minutes of data) • Accurate to few centimeters (1-2 horizontal, 2-4 vertical) • Network solution rather than individual baselines • Need more accurate ionospheric and tropospheric modeling

  6. OPUS Rapid Static (OPUS-RS) cont. • Uses RSGPS program instead of PAGES (based on OSU MPGPS program) • Uses P1 and P2 as well as L1 and L2 obs. • Resolves all ambiguities with LAMBDA • Geometry free linear combination used to determine DD ionospheric delays

  7. OPUS Projects • Managers can define a project • Process any number of stations under a project • Project can span several days to weeks • Contract work • Project processing • Each dataset sent to OPUS but identified with a project • Results returned to submitter a few minutes later • Manager can monitor processing and submission • Final adjustment • Entire project adjusted as one campaign • Review & submission to NGS

  8. OPUS GIS • Compute a differential pseudo range solution for less expensive GPS receivers • Aimed at the GIS community who do not require cm level accuracies • Allows processing in a consistent approach and “certify” their locations in the NSRS • Generate rapid static solution from seconds or minutes of data • Accuracies: A few decimeters to a meter horizontally

  9. OPUS • Questions ? • Suggestions !

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