C-Nav 2050M User Manual - page 107
C-Nav2050 User Guide
Service in which dual-frequency ionospheric
measurements are available at both the reference
receivers and the user receivers. It is the use of dual-
frequency receivers at both the reference stations and
the user equipment together with the advanced
processing algorithms, which makes the exceptional
accuracy of the C-Nav system possible.
Creating the corrections is just the first part. From our
two processing centers, the differential corrections are
then sent to the Land Earth Station (LES) for uplink to
L-band communications satellites. The uplink sites for
the network are equipped with C-Nav-built modulation
equipment, which interfaces to the satellite system
transmitter and uplinks the correction data stream to the
satellite that broadcasts it over the coverage area. Each
L-band satellite covers more than a third of the earth.
Users equipped with a C-Nav precision GPS receiver
actually have two receivers a single package, a GPS
ceiver and an L-band com unications receiver, both
his system. The GPS receiver
atellites in view and makes pseudorange
es
s
ccuracy is
ceivers, processors and communication interfaces,
hich switch automatically or in response to a remote
ontrol signal from the processing centers. The data
in
m
re
designed by C-Nav for t
tracks all the s
measurements to the GPS satellites. Simultaneously,
the L-band receiver receives the correction messag
broadcast via the L-band satellite. When the correction
are applied to the GPS measurements, a position
measurement of unprecedented real time a
produced.
Reliability
The entire system meets or exceeds a target availability
of 99.99%. To achieve this, every part of the
infrastructure has a built-in back-up system.
All the reference stations are built with duplicate
re
w
c
C-3