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15. Control Segment
... segment of the Global Positioning System is a network of ground stations that monitors the shape and velocity of the satellites' orbits. The accuracy of GPS data depends on knowing the positions of the satellites at all times. The ...
dwd1 - 08/20/2020 - 14:06
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19. User Equivalent Range Errors
... to the total error budget. Satellite clock : GPS receivers calculate their distances from satellites as a function of the ... is transmitted by a satellite and when it is received on the ground. The atomic clocks on board NAVSTAR satellites are extremely accurate. ...
dwd1 - 08/23/2019 - 15:03
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24. Post-Processed Differential Correction
... positioning is required (Van Sickle, 2001). In static GPS positioning, two or more receivers measure their positions from fixed ... area in Alaska. The objective was to survey a set of nine ground control points (GCPs) that would later be used to orthorectify a ...
dwd1 - 08/23/2019 - 15:17
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17. Satellite Ranging
GPS receivers calculate distances to satellites as a function of the amount of time it takes for satellites' signals to reach the ground. To make such a calculation, the receiver must be able to tell precisely ... The GPS satellite constellation is in effect an orbiting control network. Try This! Trimble has a tutorial "designed to ...
dwd1 - 08/20/2020 - 14:08
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20. Dilution of Precision
... of satellites in the sky also affects the accuracy of GPS positioning. The ideal arrangement (of the minimum four satellites) is one ... have had a chance to use GPS survey technology for gathering ground control data in my region and the biggest challenge is often the PDOP ...
dwd1 - 08/23/2019 - 15:05
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14. Image Correction
... satisfied with the raw data transmitted from satellites to ground stations. Most prefer preprocessed data from which these flaws have been ... correction technique used to improve the accuracy of GPS data in the sense that it involves measuring error (or, in this case, ...
Stevie Rocco - 08/30/2019 - 15:10
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14. Image Correction
... satisfied with the raw data transmitted from satellites to ground stations. Most prefer preprocessed data from which these flaws have been ... correction technique used to improve the accuracy of GPS data in the sense that it involves measuring error (or, in this case, ...
dwd1 - 08/03/2017 - 16:04
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12. Vertical Positions
... instrument is positioned midway between a point at which the ground elevation is known (point A) and a point whose elevation is to be ... above the geoid is called an orthometric height. However, GPS receivers cannot produce orthometric heights directly. Instead, GPS ...
dwd1 - 08/23/2019 - 14:16