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Precise Cooperative Positioning

Precise Cooperative Positioning. By Simon Banville Canadian Geodetic Survey, Natural Resources Canada 31 March 2014 Presented at the FGCB Infrastructure Task Group Meeting. Outline. GNSS Precise Positioning: Methodologies Current Status in Canada Precise Cooperative Positioning

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Precise Cooperative Positioning

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  1. Precise Cooperative Positioning By Simon Banville Canadian Geodetic Survey, Natural Resources Canada 31 March 2014 Presented at the FGCB Infrastructure Task Group Meeting

  2. Outline • GNSS Precise Positioning: Methodologies • Current Status in Canada • Precise Cooperative Positioning • Canada’s Cooperative Network

  3. GNSS Precise Positioning RTK • Accurate local positioning • Fast convergence • Need a local reference station User Reference station Network RTK • Accurate regional positioning • Fast convergence • Need a regional network of reference stations Processing facility User Reference stations

  4. GNSS Precise Positioning PPP • Accurate global positioning • Slow convergence (30 minutes +) • No dependency on a regional network Global network of reference stations User PPP-RTK Optional regional network • Accurate global positioning • Fast convergence if access to a regional network is available User Reference stations

  5. GNSS Precise Positioning • Example from Shediac, NB: 3 reference stations @ 100 km PPP PPP-RTK From Banville et al. [2014]. Accepted for publication in Navigation.

  6. Current Status in Canada • PPP was selected as the method of choice for positioning relative to the CSRS due to the sparse network in Canada. • PPP serves a multitude of users, but convergence time is a limiting factor for several applications. • More users could benefit from our services if a significant reduction in convergence time could be achieved. • The Canadian Geodetic Survey (CGS) is thus investigating the possibility of moving from a PPP approach to a PPP-RTK approach.

  7. Current Status in Canada 50 stations cover 10 million km2 !

  8. Precise Cooperative Positioning • CGS does not have the infrastructure required for PPP-RTK (not enough reference stations). • For PPP-RTK to happen in Canada, we need access to all available reference stations: • Federal • Provincial • University • Individual users (e.g. land surveyors) • Etc. • Such an approach could be called ‘cooperative positioning’ since it is based on the cooperation of several organizations.

  9. Canada’s Cooperative Network • Potential contributors #1: NGS Source: http://www.ngs.noaa.gov/CORS/

  10. Canada’s Cooperative Network • Potential contributors #2: CHAIN Source: http://chain.physics.unb.ca/chain/

  11. Canada’s Cooperative Network • Potential contributors #3: PGC and BC provincial network ($) West Coast Deformation Array (WCDA) Source: http://archive.ilmb.gov.bc.ca/crgb/products/geospatial/bcacs.htm

  12. Canada’s Cooperative Network • Potential contributors #4: QC provincial network ($) Source: http://www.mrn.gouv.qc.ca/

  13. Canada’s Cooperative Network • Potential contributors #5: RTK service providers (?) • Brandt (57/green) Leica (112/blue) Prairie Precision (68/not shown) • Cansel(245/red) Pleiades (19/black) Topcon (80/cyan) Source: Craymer [2014]

  14. Canada’s Cooperative Network • CGS is looking for continuously operated receivers to densify the network of reference stations. • Sharing data from a GNSS receiver would improve positioning performances in the areas surrounding it. • The more stations are available, the better the service becomes.

  15. Summary • Cooperative positioning can improve access to the Canadian spatial reference system. • Existing permanent stations (CACS, CHAIN, NGS) can already allow PPP-RTK in limited areas. • Any continuously-operated receiver could potentially improve PPP convergence somewhere in Canada…

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