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GPS Observables

GPS PWV Estimation and Support to UNSTABLE S. Skone Dept. of Geomatics Engineering University of Calgary. GPS Observables. Range Observation P = +d+c(dt s -dt r )+ion+SD+ p. = geometric range d = orbital errors dt s = satellite clock error dt r = receiver clock error

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GPS Observables

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  1. GPS PWV Estimation and Support to UNSTABLES. SkoneDept. of Geomatics EngineeringUniversity of Calgary

  2. GPS Observables Range Observation P = +d+c(dts-dtr)+ion+SD+p • = geometric range d = orbital errors dts = satellite clock error • dtr = receiver clock error ion = ionosphere range delay SD = neutral atmosphere range delay  = noise and multipath

  3. PWV Estimation PWV SWD = M(E)  ZWD PWV =   ZWD PWV derived with mm-level accuracy

  4. U of C Network Continuous 30-s data since 2003 Processed to derive 30-minute PWV estimates at each site

  5. Focus Surveys operates network of GPS reference stations in Alberta Network used to derive corrections for precise surveys conducted by Focus Agreement in place Fall 2006 to share sites and infrastructure Focus to maintain and support real-time data streaming from four sites: Olds, Cochrane, Strathmore and Vulcan Data (GPS and met) sent to ftp server at University of Calgary Collaboration with Focus

  6. Anticipate approximately three-four spare GPS receivers available for deployment at temporary sites in 2008 (Limestone mountain, Alford Lake, others?) May need to be augmented with met sensors Will continue to operate GPS sites in Sundre and Cremona (foothills) Radiometrics MP-1500 microwave profiler available for temporary deployment (water vapour profiler) Radiometrics WVR-1100 water vapour radiometer available for temporary deployment (PWV and liquid water) Both profiler and radiometer equipped with “super-blower” rain effect mitigation U of C Infrastructure

  7. MET3A Radiometer GPS antenna Equipment

  8. Equipment

  9. 25 km PWV Resolution GPS receiver

  10. Radar GPS 1000 LT

  11. Radar GPS 1100 LT

  12. Radar GPS 1200 LT

  13. Radar GPS 1300 LT

  14. Radar GPS 1400 LT

  15. Radar GPS 1500 LT

  16. Radar GPS 1600 LT

  17. Radar GPS 1700 LT

  18. Radar GPS 1800 LT

  19. Radar GPS 1900 LT

  20. Radar GPS 2000 LT

  21. Radar GPS 2100 LT

  22. Indices derived based on rate of change of PWV and mixing ratio Some correlation of index with storm development for Sundre site After applying absolute PWV threshold, prediction of thunderstorm development possible Sundre Site Analysis

  23. Post-processing conducted using commercial software (Bernese version 5.0) UofC capabilities to set up automated processing of large data sets (network adjustment augmented with national GPS reference sites) Complex iterative process which requires training UofC graduate student expertise available for data processing and analysis Anticipate two months of student time at $2,000 per month Processing Requirements

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