Appendix
ProMARK X
A-6
All of these error sources have an important characteristic in common; the
amount and direction of the error at any given time does not change rapidly.
Therefore, two GPS receivers that are sufficiently close together will observe
the same fix error, and the size of the fix error can be determined.
Non-Correctable Errors
Non-correctable errors cannot be correlated between two GPS receivers that
are located in the same general area. Sources of non-correctable errors
include receiver noise, which is unavoidably inherent in any receiver, and
multipath errors, which are environmental. Multipath errors are caused by
the receiver "seeing" reflections of signals that have bounced off of
surrounding objects. (The ProMARK X antenna and the Magellan exterior
antenna have been designed to minimize the effects of this problem. The
submeter antenna is multipath-resistant; its use is required when logging
carrier phase data.) Neither error can be eliminated with differential, but they
can be reduced substantially with position fix averaging.
ERROR SOURCES
Correctable with Differential
Clock (Space Segment)
3.0 meters
Ephemeris (Control Segment)
2.7 meters
Ionospheric Delay (Atmosphere)
8.2 meters
Tropospheric Delay (Atmosphere)
1.8 meters
Selective Availability (if implemented)
27.4 meters
TOTAL
28.9 meters
Non-Correctable with Differential
Receiver Noise (Unit)
9.1 meters
Multipath (Environment)
3.0 meters
TOTAL
9.6 meters
Total User Equivalent Range Error
(all sources)
30.5 meters
Navigational Accuracy (HDOP=1.5)
45.8 meters
Error Source
Approx.
Equivalent Range
Error (RMS)
Содержание GPS PROMARK X
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