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Performance Specifications
One of the most important functions of the GG Surveyor is providing real-time
position solutions with accuracy ranging from centimeter level to 100 meters. Table
1.2 summarizes the positioning modes and expected accuracy.
Positioning Mode
Real-Time Position-
Autonomous
Real-Time Position-
Code Differential
Real-Time Position-
RTK/Carrier Differential-
Float mode
Real-Time Position- RTK/
Carrier Differential-
Fixed mode
Velocity Accuracy-
Autonomous
Velocity Accuracy-
Code Differential
Velocity Accuracy-
RTK/Carrier Differential-
Float mode
Velocity Accuracy-
RTK/Carrier Differential-
Fixed mode
Position and velocity accuracy are for horizontal errors based on tests except for the 100 meter GPS
value, which is the 2dRMS accuracy promised by the US Department of Defense. Tests were
conducted in California and Moscow with 10°elevation mask angles, medium to high multipath
environment. A GG24 Reference Station board was used to provide differential corrections over a
short baseline. Differential data rate 300 bps, HDOP <4. Position accuracy specifications are for
horizontal position. Vertical error <2X horizontal error.
Introduction
Table 1.2: Accuracy as Function of Mode
GPS + GLONASS
7 meters (CEP 50%)
25 meters (CEP 50%)
16 meters (95%)
100 meters (95%)
35 centimeter (CEP)
40 centimeters (CEP)
75 centimeters (95%)
90 centimeters (95%)
<10 centimeters (95%)
<10 centimeters (95%)
1 centimeter (CEP)
2 centimeters (95%)
0.15 knots (mean)
1 knots (mean)
0.30 knots (95%)
4 knots (95%)
0.04 knots (mean)
0.05 knots (mean)
0.1 knots (95%)
0.1 knots (95%)
0.02 meters/sec (mean)
0.02 meters/sec (mean)
0.05 meters/sec (95%)
0.05 meters/sec (95%)
0.02 meters/sec (mean)
0.05 meters/sec (95%)
GPS Only
GLONASS Only
8 meters (CEP 50%)
20 meters (95%)
50 centimeters (CEP)
1 meter (95%)
N/A
N/A
N/A
0.03 knots (mean)
0.05 knots (95%)
0.02 knots (mean)
0.05 knots (95%)
N/A
N/A
N/A
3
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