ST2276
Scientech Technologies Pvt. Ltd.
60
Point Positioning :
A geographic position produced from one receiver in a standalone mode.
Precise Positioning Service (PPS) :
The highest level of military dynamic positioning accuracy provided by GPS, using
the dual-frequency P-code.
Pseudolite (shortened form of pseudo-satellite) :
A ground-based differential GPS receiver that simulates the signal of a GPS satellite
and can be used for ranging. The data portion of the signal may also contain
differential corrections that can be used by receivers to correct for GPS errors.
PRN - Pseudorandom noise :
A sequence of digital 1’s and 0’s that appear to be randomly distributed like noise but
that can be reproduced exactly. Their most important property is a low autocorrelation
value for all delays or lags except when they coincide exactly. Each GPS satellite has
unique C/A and P pseudorandom-noise codes.
Pseudorange :
A distance measurement; based on the correlation of a satellite-transmitted code and
the local receiver's reference code, that has not been corrected for errors in
synchronization between the transmitter's clock and the receiver's clock.
Radionavigation :
The determination of position, or the obtaining of information relative to position, for
the purpose of navigation by means of the propagation properties of radio waves. GPS
is a method of radionavigation.
Range rate :
The rate of change between the satellite and receiver. The range to a satellite changes
due to satellite and observer motions. Range rate is determined by measuring the
Doppler shift of the satellite beacon carrier.
Relative navigation :
A technique similar to relative positioning, except that one or both of the points may
be moving. A data link is used to relay error terms to the moving vessel or aircraft to
improve real-time navigation.
Relative positioning :
The process of determining the relative difference in position between two locations,
in the case of GPS, by placing a receiver over each site and making simultaneous
measurements observing the same set of satellites at the same time. This technique
allows the receiver to cancel errors that are common to both receivers, such as
satellite clock and ephemeris errors, propagation delays, and so forth.
Reliability :
The probability of performing a specified function without failure under given
conditions for a specified period of time.
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