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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.
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.
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GPS Landing and Navigation System GLNU GPS Landing and Navigation Unit GLS GBAS Landing System GLU GPS landing unit GM guidance material GMM general maintenance manual GMT Greenwich Mean Time: GND ground: Airfield operations GP glide path See instrument landing system: GPP general practices and procedures GPS Global Positioning System: Avionics GPU
An update region represents a geographic area in a database that can be subject to an update. Update regions thus enable incremental and partial updating of defined geographic regions within an NDS database. Example: Each European country within the product "Europe basic navigation" may be presented by a separate update region.
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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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