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Submit GPS data to OPUS Web site Processed automatically on NGS computers

Online Positioning User Service (OPUS). Submit GPS data to OPUS Web site Processed automatically on NGS computers Ties to 3 CORS (OPUS-S) or Ties to up to 9 CORS (OPUS-RS) Solution via email - in minutes Fast, easy, consistent access to NSRS. combined. L1/L2 data 2-48hrs GPS (OPUS-S)

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Submit GPS data to OPUS Web site Processed automatically on NGS computers

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  1. Online Positioning User Service (OPUS) • Submit GPS data to OPUS Web site • Processed automatically on NGS computers • Ties to 3 CORS (OPUS-S) or • Ties to up to 9 CORS (OPUS-RS) • Solution via email - in minutes • Fast, easy, consistent access to NSRS

  2. combined

  3. L1/L2 data • 2-48hrs GPS (OPUS-S) • 15min-4hrs GPS (OPUS-RS) • Static GPS observations only • 30-second epochs processed • Correct vertical requires: • antenna type/phase model • mark-to-ARP vertical height OPUS Guidelines

  4. e-mail GPS file antenna options antenna height OPUS-S (2 hr) OPUS-RS (15 min)

  5. OPUS Options specify SPCS specify CORS

  6. OPUS Options (cont) extended output XML output OPUS project user profile

  7. Antenna Height • true vertical distance • measured in meters ARP MARK

  8. GPS Antenna Calibration site for photos/diagrams: www.ngs.noaa.gov/ANTCAL/

  9. CORS B How are OPUS-S Positions Computed? • NGS PAGES processing software • Ionospheric-free solution • Tropospheric scale height adjusted • Fixed ambiguities • Average of 3 unique CORS ties • ITRF & NAD83 coordinates/errors CORS A + CORS C

  10. Is Your Solution Good? • > 90% observations used • > 50% ambiguities fixed • < 3 cm overall RMS • check ephemeris type • check antenna info • < 5 cm peak-to-peak errors …and which CORS were used? … resubmit later for better CORS scenario & ephemeris

  11. NGS/IGS Precise Orbits • Precise (Final) • 14 days latency • 1 cm accuracy • updated weekly • Rapid • 1 days latency • 2 cm accuracy • updated daily • UltraRapid • 24 hrs observed / 24 hrs predicted • 5 cm / 10 cm accuracy • updated 4 times/day

  12. OPUS – a good example of a bad solution SOFTWARE: page5 0601.10 master10.pl START: 2006/07/05 16:50:00 EPHEMERIS: igr13823.eph [rapid] STOP: 2006/07/05 19:08:00 NAV FILE: brdc1860.06n OBS USED: 638 / 2232 :29% ANT NAME: TPSLEGANT2 NONE # FIXED AMB: 10 / 18 :56% ARP HEIGHT: 1.524 OVERALL RMS: 0.027(m) REF FRAME: NAD83(CORS96)(EPOCH:2002.0000) ITRF00(EPOCH:2006.5089) X: -1639093.491(m) 2.480(m) -1639094.183(m) 2.480(m) Y: -5109885.356(m) 17.452(m) -5109883.985(m) 17.452(m) Z: 3439706.485(m) 7.775(m) 3439706.366(m) 7.775(m) LAT: 32 50 2.51844 2.899(m) 32 50 2.53444 2.899(m) E LON: 252 12 55.30565 2.965(m) 252 12 55.26422 2.965(m) W LON: 107 47 4.69435 2.965(m) 107 47 4.73578 2.965(m) EL HGT: 2211.550(m) 18.815(m) 2210.566(m) 18.815(m) ORTHO HGT: 2234.643(m) 18.815(m) [Geoid03 NAVD88]

  13. OPUS – Extended Output • HTDP-transform CORS ITRF coordinates from published epoch to session midpoint • remote station ITRF solution from each CORS • G-files – vector components, standard deviations, & correlations for each vector • post-fit RMS & # observations per satellite/vector • solution covariance matrix-relates errors in each coordinate to every other coordinate • network accuracies - H & V • summary of NAD83 derivation • SPC feet values, if available for user’s state

  14. OPUS-Rapid Static (OPUS-RS) • 15-minute sessions • ties to 3 – 9 CORS (< 250km) • uses RSGPS vs. PAGES software • P1/P2 code & L1/L2 phase observations • resolves all ambiguities with LAMBDA • similar to Real-Time Network computations • RSGPS solution modes: • network: solves ambiguities, tropo, iono • rover: tropo and ion interpolated to rover • ~10,000 lines of code

  15. OPUS-RS Output NGS OPUS-RS SOLUTION REPORT     USER: william.stone@noaa.gov                 DATE: October 29, 2007 RINEX FILE: 1207287x.07o                         TIME: 14:39:04 UTC  SOFTWARE: rsgps  1.09 RS11.prl 1.12     START: 2007/10/14 23:27:15 EPHEMERIS: igr14490.eph [rapid]                     STOP: 2007/10/15 00:00:15 NAV FILE: brdc2870.07n                        OBS USED:   1962 /  2082   :  94% ANT NAME: ASH701975.01A                 QUALITY IND.   34.21/ 37.91 ARP HEIGHT: 0.0                           NORMALIZED RMS: 0.307  REF FRAME: NAD_83(CORS96)(EPOCH:2002.0000)    ITRF00 (EPOCH:2007.78627)     LAT: 36  2 52.79767      0.008(m)       36  2 52.81498     0.008(m)      E LON:   252  2 18.45532    0.013(m)       252  2 18.41156     0.013(m)      W LON:   107 57 41.54468  0.013(m)       107 57 41.58844     0.013(m)      EL HGT:         1974.304(m)   0.005(m)       1973.396(m)   0.005(m)  ORTHO HGT:         1995.280(m)   0.026(m) [Geoid03 NAVD88] * • “#Fixed Ambiguities” replaced by “Quality Indicator” • average of W-ratio (separation between candidate sets of ambiguities) of last 3 epochs • reported as network mode / rover mode • look for values > 3 for confidence in solution

  16. OPUS-RS Output NGS OPUS-RS SOLUTION REPORT     USER: william.stone@noaa.gov                 DATE: October 29, 2007 RINEX FILE: 1207287x.07o                         TIME: 14:39:04 UTC  SOFTWARE: rsgps  1.09 RS11.prl 1.12     START: 2007/10/14 23:27:15 EPHEMERIS: igr14490.eph [rapid]                     STOP: 2007/10/15 00:00:15 NAV FILE: brdc2870.07n                        OBS USED:   1962 /  2082   :  94% ANT NAME: ASH701975.01A                 QUALITY IND.   34.21/ 37.91 ARP HEIGHT: 0.0                           NORMALIZED RMS: 0.307  REF FRAME: NAD_83(CORS96)(EPOCH:2002.0000)    ITRF00 (EPOCH:2007.78627)     LAT: 36  2 52.79767      0.008(m)       36  2 52.81498     0.008(m)      E LON:   252  2 18.45532    0.013(m)       252  2 18.41156     0.013(m)      W LON:   107 57 41.54468  0.013(m)       107 57 41.58844     0.013(m)      EL HGT:         1974.304(m)   0.005(m)       1973.396(m)   0.005(m)  ORTHO HGT:         1995.280(m)   0.026(m) [Geoid03 NAVD88] * • “Overall RMS” replaced by “Normalized RMS” • unitless quantity, “expected” = 1 • aka standard deviation of unit weight • if > 1, noisy data somewhere • typically <1, meaning noise less than expected

  17. OPUS-RS Output NGS OPUS-RS SOLUTION REPORT     USER: william.stone@noaa.gov                 DATE: October 29, 2007 RINEX FILE: 1207287x.07o                         TIME: 14:39:04 UTC  SOFTWARE: rsgps  1.09 RS11.prl 1.12     START: 2007/10/14 23:27:15 EPHEMERIS: igr14490.eph [rapid]                     STOP: 2007/10/15 00:00:15 NAV FILE: brdc2870.07n                        OBS USED:   1962 /  2082   :  94% ANT NAME: ASH701975.01A                 QUALITY IND.   34.21/ 37.91 ARP HEIGHT: 0.0                           NORMALIZED RMS: 0.307  REF FRAME: NAD_83(CORS96)(EPOCH:2002.0000)    ITRF00 (EPOCH:2007.78627)     LAT: 36  2 52.79767      0.008(m)       36  2 52.81498     0.008(m)      E LON:   252  2 18.45532    0.013(m)       252  2 18.41156     0.013(m)      W LON:   107 57 41.54468  0.013(m)       107 57 41.58844     0.013(m)      EL HGT:         1974.304(m)   0.005(m)       1973.396(m)   0.005(m)  ORTHO HGT:         1995.280(m)   0.026(m) [Geoid03 NAVD88] * * • Peak-to-Peak replaced by Est. Standard Deviations • approximately 95% confidence • derived from scatter of single baseline solutions • formal standard deviations (optimistic) available in Extended Output

  18. OPUS-RS Reference Station Search Algorithm

  19. Interpolative Dilution of Precision (IDOP) OPUS-RS accuracy is dictated by CORS geometry and distances IDOP - local CORS geometry relative to rover location [min = 1/sqrt(#CORS)] RMSD – CORS distances * Forthcoming paper in “GPS Solutions” – Accuracy Assessment of the NGS’s OPUS-RS Utility By C. Schwarz, R. Snay, & T. Soler

  20. Estimated Vertical Standard Errors – f(IDOP & RMSD) 15-Minute OPUS-RS Sessions Estimated Horizontal Standard Errors – divide by 3.6

  21. Expected OPUS-RS Standard Error Values in E or N Dimension: f (IDOP & Rover RMSD)

  22. OPUS-Database (OPUS-DB) • streamlined method for users to publish their results • user registration –ID/password & validation process • submission review by user and NGS photo(s) description form GPS data observation log NGS website: OPUS-DB DATASHEET

  23. NGS-calibrated GPS antenna • minimum 4 hour data span • minimum 70% observations used • minimum 70% fixed ambiguities • maximum 0.04m horizontal peak-to-peak • maximum 0.08m vertical peak-to-peak OPUS-DB Acceptance Criteria • OPUS-DB >>>>> • GPS on BMs for improved geoid model • improving coordinates for PLSS

  24. OPUS-DB Datasheet

  25. OPUS-Projects Under Construction • project planning / monitoring • automated file management • review repeat measurements • reports sent to project managers • network adjustment • publish in NGS database

  26. GIS & Mapping New Opportunities for Surveyors OPUS-Mapper • range solutions • single frequency observations • kinematic trajectories computed • accuracy appropriate for mapping/GIS • generate shapefiles Under Construction

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