Table of Contents
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Chapter 1
GPS User
The NovAtel G-III Reference Receiver provides GPS monitoring functionality as part of the Reference Stations
in the SBAS network.
1.2
Features
To assist the Reference Stations in providing data with the necessary precision, the G-III Reference Receiver
has the following features:
•
Support for L1, L2 and L5 GPS signal processing
•
Support for L1 and L5 GEO signal processing
•
GPS signal quality monitoring (SQM) functionality, see Section 1.2.4, Signal Quality Monitoring
on Page 17
•
Digital pulse blanking
•
Cross-Correlation Check
•
Time Receiver Autonomous Integrity Monitor (TRAIM)
1.2.1
GEO Processing
Specific channels in the G-III Reference Receiver have the capability to receive and process the SBAS signal
provided by GEOs. The signals are in-band at L1 and L5 SBAS and are identified through SBAS-specific PRN
(PseudoRandom Noise) numbers. The SBAS message and associated pseudorange are provided as an output.
16
Figure 2: SBAS Concept
Geostationary
Satellite (GEO)
L1 and C-Band
L1 and L5
Reference
Reference
Station
Station
Master
Station
WAAS G-III Reference Receiver User Manual Rev 1
GPS Satellite
Constellation
L1, L2 and L5
C-Band
Reference
Station
Integrity data,
differential corrections,
time control and status
Introduction
Integrity data,
differential corrections
and ranging control
Ground Uplink
Subsystem
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