GPS World

Tag: GAPS

  • New name, new version for GAPS software

    New name, new version for GAPS software

    GAPS v6.0.0 is now rebranded as the GNSS Analysis and Positioning Software.

    GAPS software — hosted by the University of New Brunswick, Canada — provides users with accurate satellite positioning using a single GNSS receiver both in static and kinematic mode. Through the use of precise orbit and clock products provided by sources such as the International GNSS Service (IGS) and Natural Resources Canada (NRCan), it is possible to achieve centimeter-level positioning in static mode and decimeter-level positioning in kinematic mode given a sufficient convergence period.

    The newest version provides users with the ability to process various combinations of GPS, Galileo and BeiDou observables as well as several other new processing features for researchers and surveyors.

    Users are invited to submit feedback via email to [email protected].

    GAPS-derived position fixes for a test drive in Fredericton. (Image: UNB)
    GAPS-derived position fixes for a test drive in Fredericton. (Image: UNB)

  • UNB GAPS for Precise Point Positioning Gets Update

    The next version of the UNB GPS Analysis and Positioning Software (GAPS), version 5.9.1, is now available.

    The new version of the precise point positioning software includes several updates and new features, including creation of GAPS Basic and Advanced user submission pages.

    The GAPS Basic user submission page allows for quick and easy submission of observation files for users who frequently use GAPS’ default processing options.

    The GAPS Advanced user submission page includes:
    •    User-selection of the orbit and clock products to be used.
    •    User-selection of the carrier-phase and pseudorange observables to be used.
    •    Optional use of GPS L2C in place of P2 for all satellites currently transmitting L2C.
    •    Optional use of GPS L5 in place of L2 for all satellites currently transmitting L5.
    •    Optional use of static-mode satellite clock interpolation (if 30s clock product is used and logging interval < 30s).
    •    User-selection of GDOP cut-off threshold.
    •    User-selection of positional convergence condition and maximum number of iterations for least-squares filter.
    •    Enhanced the cycle-slip detection algorithm (following Blewitt, 1990).
    •    A minimum of 4 satellites per epoch are required before estimation begins.
    •    User-selection of all available neutral atmosphere delay (NAD) prediction model and mapping function (MF) combinations.

    NAD prediction models include: UNB-VMF1 (NCEP), UNB-VMF1 (CMC), VMF1 (ECMWF), UNB3m, GPT2 (1×1 deg.), ESA 2.5 and None

    Mapping function options are: Vienna MF and Niell MF.

    •    User option to not estimate NAD.
    •    User option to not estimate tropospheric gradients.
    •    Optional use of a user-provided receiver antenna calibration file.
    •    NAD estimation automatically terminated if receiver rises above neutral atmosphere threshold (50,000 ft = 15,240 m).
    •    Added option to estimate precipitable water (if a meteorological file is submitted).
    •    New .ion, .cmp, .nad, and .DOP output files as well as modified formatting of the .par file.
    •    Improved reporting of processing parameter options and results in the HTML output.
    •    Added receiver clock and DOP plots.
    •    Added height component to kml output.

    For information on the processing strategy, visit the web page. Your feedback (suggestions, bug reports, etc.) is welcome via the GAPS Development Team email: [email protected].