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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. Tolman–Oppenheimer–Volkoff equation - Wikipedia

    en.wikipedia.org/wiki/Tolman–Oppenheimer...

    [4] [5] The form of the equation given here was derived by J. Robert Oppenheimer and George Volkoff in their 1939 paper, "On Massive Neutron Cores". [1] In this paper, the equation of state for a degenerate Fermi gas of neutrons was used to calculate an upper limit of ~0.7 solar masses for the gravitational mass of a neutron star .

  4. 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.

  5. 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

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. International Terrestrial Reference System and Frame

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

    The GPS reference epoch was moved from 2000.0 to 2001.0 in G1150 due to the magnitude 7.9 Denali Fault earthquake in Alaska in November 2002. Still in 2022 ITRF2020 was released, yet GPS was only using G2139 in its antennas, which was aligned to ITRF2014 (IGb14) (though at epoch 2016.0, not reference epoch 2010.0). [ 9 ]

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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