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  2. Geometrical Product Specification and Verification - Wikipedia

    en.wikipedia.org/wiki/Geometrical_Product...

    Geometrical Product Specification and Verification (GPS&V) [1] is a set of ISO standards developed by ISO Technical Committee 213. [2] The aim of those standards is to develop a common language to specify macro geometry (size, form, orientation, location) and micro-geometry (surface texture) of products or parts of products so that the language can be used consistently worldwide.

  3. Time to first fix - Wikipedia

    en.wikipedia.org/wiki/Time_to_first_fix

    The TTFF is commonly broken down into three more specific scenarios, as defined in the GPS equipment guide: Cold or factory The receiver is missing or has inaccurate estimates of its position, velocity, the time, or the visibility of any of the GPS satellites. As such, the receiver must systematically search for all possible satellites.

  4. Dilution of precision (navigation) - Wikipedia

    en.wikipedia.org/wiki/Dilution_of_precision...

    HDOP AND GPS HORIZONTAL POSITION ERRORS; Article on DOP and Trimble's program: Determining Local GPS Satellite Geometry Effects On Position Accuracy. Notes & GIF image on manually calculating GDOP: Geographer's Craft; GPS Errors & Estimating Your Receiver's Accuracy: Sam Wormley's GPS Accuracy Web Page

  5. Localizer performance with vertical guidance - Wikipedia

    en.wikipedia.org/wiki/Localizer_Performance_with...

    Localizer performance with vertical guidance (LPV) are the highest precision GPS (SBAS enabled) aviation instrument approach procedures currently available without specialized aircrew training requirements, such as required navigation performance (RNP).

  6. International Terrestrial Reference System and Frame

    en.wikipedia.org/wiki/International_Terrestrial...

    Constructed with input data under the form of time series of station positions and Earth Orientation Parameters. [5] This version introduces extra parameters to describe the year-periodic motion of the stations: A (amplitude) and φ (phase) per-axis. This sort of seasonal variation has an amplitude of around 1 cm and is attributed to non-tidal ...

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  9. List of aviation, avionics, aerospace and aeronautical ...

    en.wikipedia.org/wiki/List_of_aviation,_avionics...

    differential GPS [1] DGR Dangerous Goods Regulation DH Decision height: Precision approach, referred to threshold elevation DIA diameter DLR datalink recorder DLR German Aerospace Center / Deutsches Zentrum für Luft- und Raumfahrt e.V. DME distance measuring equipment: DME Designated Mechanic Examiner [2] A person appointed by the FAA DMI