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Pilot Project Report: Feasibility of using Natural Resources Canada’s High Precision GPS Correction (HP-GPS*C) Service for Hydrographic Surveys in the Canadian Arctic FGCB Infrastructure Task Group Meeting, March 31, 2014.

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Pilot Project Report: Feasibility of using Natural Resources Canada’s High Precision GPS Correction (HP-GPS*C) Service for Hydrographic Surveys in the Canadian Arctic FGCB Infrastructure Task Group Meeting,March 31, 2014

Ken MacLeod, Natural Resources Canada(NRCan), Canadian Geodetic Survey(CGS) and Serge Levesque, Fisheries and Oceans Canada, Canadian Hydrographic Survey(CHS)

overview
Overview
  • Description of the Pilot Project
    • Determine feasibility of using NRCan’s Real-Time High Precision GPS Correction Service(HP-GPS*C) in the Canadian Arctic for sounding surveys
  • Description of NRCan’s HPGPS*C Service
  • Review of data communications technologies available in the Canadian Arctic
  • Description of CHS Survey Vessel and Positioning Systems
  • Comparison of Positioning Results
  • Summary and Recommendations
pilot project to determine the feasibility of using hp gps c in the arctic
Pilot Project to determine the Feasibility of using HP-GPS*C in the Arctic
  • Pilot Project was a partnership between: CGS, CHS, Canadian Coast Guard(CCG) and Novatel Inc.
    • CGS provided the HP-GPS*Corrections
    • CHS provided the survey vessel, positioning and sounding equipment
    • CCG provided the support ship and funding for the data communications
    • Novatel Inc. provided a GNSS receiver capable of Precise Point Positioning(PPP) using HP-GPS*C
feasibility continued
Feasibility Continued…
  • CHS sounding surveys require precise and accurate height estimation. In the past the CDGPS service was used and current practice is to use WAAS or RTK
    • The WAAS service area does not cover the entire Canadian Arctic nor does it provide accurate heights (code based heights ~metre level)
    • RTK accuracy is excellent for near shore applications, however, for longer vectors accuracy degrades. Setting up and maintaining an RTK network in the Arctic is time consuming and costly
feasibility continued1
Feasibility Continued…
  • CHS, CGS and CCG agreed to conduct a Pilot Project to determine if it was feasible to use HP-GPS*C in the Arctic using commercially available equipment
    • Internet Protocol(IP) satellite communications services are currently available: Inmarsat and Iridium
    • RTCM industry standard correction format (RTCM-State Space Representation (RTCM-SSR – from CGS)) and transport protocol (Network Transport of RTCM over IP(NTRIP)) were used
    • Novatel Inc. provided a GNSS receiver capable of using RTCM-SSR corrections and computing PPP positions in real-time
description of the hp gps c service
Description of the HP-GPS*C Service
  • CGS’s Real-Time HP-GPS*Correction Service provides orbit and clock corrections in RTCM-SSR format
  • Estimation of precise corrections requires a global tracking network(continuous signal tracking)
  • CGS is an International GNSS Service (IGS) partner and have access to a global real-time tracking network that consists of approximately 130 stations
cgs network and data centre description
CGS Network and Data Centre Description
  • CGS Operates two Independent Real-Time Data Centres (RT-DC)
  • Each RT-DC Features Independent:
    • Internet access
    • Station data access
    • HP-GPS*C correction estimation
    • NTRIP HP-GPS*C RTCM-SSR distribution
internet protocol satellite communications technologies
Internet Protocol Satellite Communications Technologies
  • Inmarsat:
  • Geostationary Satellite System
  • Provides Global service
  • Not available north or south of ~70 Degrees Latitude
  • Hardware designed for maritime environment
internet protocol satellite communications continued
Internet Protocol Satellite Communications Continued….
  • Iridium:
  • Low earth orbiting (LEO) satellite constellation
  • Global Coverage including the polar regions
  • Hardware designed for maritime environment – but large antenna ~ 2 ft or 0.6m in diameter
summary recommendations
Summary / Recommendations
  • Continue to improve HP-GPS*C accuracy and broadcast protocol
  • Work with RTCM and Novatel to adopt and implement a station based ionosphere correction to enable rapid convergence and re-convergence
  • Investigate HP-GPS*C rebroadcast options in regions where the Inmarsat satellite is weak (low elevation angle) or the signal is blocked by topography. CCG base ship would re-broadcast corrections using RTK modems (~25 km range)