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Table A.4: Approximate Position Error, Mixed GPS+GLONASS (continued)
Number of
Number of
50%
95%
GPS Satellites
GLONASS Satellites
≥4
1
~ 25 m
~100 m
(no improvement over
stand-alone GPS)
With the full 24-satellite GLONASS constellation, more than 5 GLONASS satellites
are in view above 10° elevation almost all the time. Check the GLONASS almanac
for exact numbers at any particular time.
By holding the GPS-GLONASS clock error fixed, the GG Surveyor calculates a 3D
position with any combination of 4 satellites (e.g., 2 GPS and 2 GLONASS). By
holding the altitude fixed, the GG Surveyor calculates a 2D position with any
combination of 3 satellites. See Chapter 6, Command/Response Formats for more
information.
A-10
GG Surveyor GPS+GLONASS Reference Manual
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