C-Nav C-NaviGator III, Руководство пользователя

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C-NaviGator III User Manual
Revision 2 Page 89 of 121 9/27/2013
information is usually (but not always) encrypted to prevent
use by unauthorized users.
Pseudorange A measure of the apparent propagation time from the
satellite to the receiver antenna, expressed as a distance.
The apparent propagation time is determined from the time
shift required to align a replica of the GNSS code generated
in the receiver with the received GNSS code. The time shift
is the difference between the time of signal reception
(measured in the receiver time frame) and the time of
emission (measured in the satellite time frame).
Pseudorange is obtained by multiplying the apparent signal-
propagation time by the speed of light. Pseudorange differs
from the actual range by the amount that the satellite and
receiver clocks are offset, by propagation delays, and other
errors including those introduced by selective availability.
PVT P osition V elocity T ime
RTCM R adio T echnical C ommission for M aritime Services)
– A
Commission set up to define a differential data link to relay
GNSS correction messages from a monitor station to a field
user. The RTCM SC-104 recommendation is the defacto
standard for differential GNSS correction transmission. It
defines the correction message format and 16 different
correction message types.
RTG R eal T ime G ypsy -- Developed by NASA's Jet Propulsion
Laboratory (JPL) to provide centimeter-level accuracy for
space applications. A single RTG subscription service,
combined with C-Nav hardware, can provide you with
worldwide positioning capability on the order of 0.1 meter.
RTK R eal T ime K inematic (or Kinematic Surveying) involves a
roving receiver that does not need to stop to collect precision
information. Meter / centimeter level accuracy is available
using modern dual-frequency carrier-phase measurement
techniques.