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Introduction
Chapter 2
Axis
3™
17
WAAS is available free of charge within the coverage area, and
it offers real-time corrections for the continental U.S. and
beyond. Corrections are typically in the 1-2 meter range, but
may be better or worse depending on the local environment.
2.6.2
WAAS reception and DGPS
WAAS consists of nationwide networks of reference stations
that analyze the GPS signal. Each of these precisely surveyed
ground stations analyze the GPS signal to see if any errors exist.
A master station calculates correction algorithms that are
uplinked to the WAAS satellites, which are then broadcast on
the same frequency as GPS (L1, 1575.42MHZ). Receivers within
the broadcast coverage area are able to use this signal for
position determination.
2.7
Axis
3
Receiver
The Axis
3
receiver is designed for multiple applications,
especially GIS data collection. It includes the following features:
•
High Performance 12-channel GPS receiver
•
L-Band differential receiver for use with OmniSTAR
network subscription
•
Dual- channel beacon receiver
•
Dual-channel WAAS functionality
•
Provides differentially corrected positions at up to a 5 Hz
rate (5 times a second)
•
One data port with transmit and receive capabilities (RS-
232)
•
Sub-meter position accuracy
•
Three LED indicator lights show operational status
•
One-pulse-per-second output signal synchronized to GPS
time
•
Accepts manual-mark input for accurate event recording
•
Outputs position information in NMEA format
•
Outputs RTCM and diagnostic messages
•
Accepts RTCM input from other DGPS sources
•
Rugged waterproof construction
Summary of Contents for Axis 3
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