Technical data

GNRT technical data

Base station (reference station) performance features:

  • Control of, and data capture by, satellite receivers with user-definable sampling rates
  • Real time data processing in the following steps:
    • inspection for completeness of data
    • check on data quality
    • data selection from user-definable parameters (elevation, signal strength, etc.)
    • computation of satellite position, elevation, azimuth and range
    • smoothing of pseudoranges through optimal smoothing algorithms
    • computation of pseudorange and velocity correctionscoding and formatting of corrections using RTCM-2.0, RTCM-2.1/2.2, RTCM 3.x or RTCM++, Geo++®-Minimum RTCM
    • transmission over LAN or WAN connections as well as serial interfaces with configurable communication rates, if necessary with modem control
    • reception and processing of mobile station data (Remote Tracking, optional)
  • Networking of multiple reference stations with GNNET
  • Recording of raw receiver data and corrections
  • Recording of raw receiver data in RINEX format (optional)
  • Remote control
  • Optional configuration as mobile reference station (relative DGPS)

Mobile station performance features

  • Control of, and data capture by, satellite receivers with user-definable sampling rates Reception of pseudorange and velocity corrections in RTCM-2.0, RTCM-2.1/2.2, RTCM 3.x or RTCM++ format.
  • Real time data processing in the following steps:
    • inspection for completeness of data
    • check on data quality from receiver-dependent quality indicators (signal strength)
    • data selection from user-definable parameters (elevation, signal strength, etc.)
    • computation of satellite position, elevation, azimuth and range
    • smoothing of pseudoranges through optimal smoothing algorithms
    • processing of complete observation and correction data with optimised position filter
    • ambiguity solutions (static at known points, or kinematic on-the-fly (OTF/OTW/OTT))
    • transformation to user-defined datum
    • GNNET-RTK multi-station solution module
    • Processing of more than one reference station
    • Processing of more than one mobile station
    • Recording of raw receiver data
    • Recording of raw receiver data in RINEX format (optional)
    • Storage of positions, velocities or trajectories
    • Output of positions, velocities or trajectory over serial interfaces (optional) and LAN/WAN connections
    • Graphic position display on digital maps (optional)
    • Setting out of points or lines (optional)
    • GNDB integrated database
    • Relative differential positioning using mobile reference station
    • Multi-station analysis with multiple reference or mobile stations (optional)
    • Optional combined processing of reference and mobile station on one computer (reverse or inverse DGPS)

Achievable accuracies:

  • 1m approx with code-only observations (pseudoranges) and RTCM-2.0 correction data
  • 0.5m approx with code observations (pseudoranges) and RTCM++ correction data
  • 1cm + 1ppm approx with carrier phase observations (GNRT-K) and RTCM++
  • 0.5 – 1cm approx with carrier phases, RTCM++ and multi-station solution
  • 0.1 – 0.5cm approx with antenna calibration/multi-path mitigation techniques
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