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Definitions (132)
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obscuration
Term used to describe periods of time when a GPS receiver's line-of-sight to GPS satellites is blocked by natural or man-made objects.
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vdop
Vertical Dilution of Precision [See DOP]
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acquisition
The process of locking onto a satellite's C/A code and P code. A receiver acquires all available satellites when it is first powered up, then acquires additional satellites as they become availab [..]
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anti-spoofing
Denial of the P-code by the Control Segment is called Anti-Spoofing. It is normally replaced by encrypted Y-code, [see P-Code and Y-Code]
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attenuation
Reduction of signal strength
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azimuth
The horizontal direction of a celestial point from a terrestrial point, expressed as the angular distance from 000° (reference) clockwise through 360°. The reference point is generally True North, but [..]
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bearing
The horizontal direction of one terrestrial point from another terrestrial point, expressed as the angular distance from a reference direction, usually measured from 000° at the reference direction cl [..]
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carrier
The steady transmitted RF signal whose amplitude, frequency, or phase may be modulated to carry information.
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carrier phase ambiguity
The number of integer carrier phase cycles between the user and the satellite at the start of tracking. (Sometimes ambiguity for short)
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carrier phase measurements
These are "accumulated doppler range" (ADR) measurements. They contain Measurements the instantaneous phase of the signal (modulo 1 cycle) plus some arbitrary number of integer cycles. Once [..]
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