Measurement Precision And Position Accuracy - Leica SPIDER GR30 User Manual

9.1.2
☞
GNSS measurements
Accuracy (rms) single
receiver navigation
mode
Accuracy in differen-
tial code mode
Accuracy in differen-
tial phase mode
68

Measurement Precision and Position Accuracy

Measurement precision, accuracy in position and height, reliability and time for
initialisation are dependent upon various factors including the number of satel-
lites tracked, the observation time, the ephemeris accuracy, the atmospheric
conditions, multipath and resolved ambiguities. Figures quoted assume normal
to favourable conditions.
The following accuracies, given as root mean square (rms), are based on meas-
urements processed using receiver firmware, LEICA Geo Office, LEICA Infinity
and the Bernese Software.
The use of multiple GNSS systems can increase accuracy by up to 30% relative
to GPS only.
Fully independent code and phase measurements of all frequencies.
Phase
0.2 mm rms
1
Precision
GPS L1/L2/L5
Resolution 0.01 mm
1 For satellites with C/No higher than 42 dB-Hz; Galileo and BeiDou values
are expected to be similar.
Resolution of Carrier to Noise ratio (C/No): 0.05 dB-Hz
Navigation accuracy 5-10 m rms for each coordinate.
Degradation possible due to Selective Availability.
Leica VADASE - Velocity & Displacement Engine
Velocity accuracy: 0.003 m/s rms horizontal, 0.005 m/s rms vertical.
•
Typical velocity derived displacement sensitivity: 1 cm/s horizontal, 2 cm/s
•
vertical.
Velocity Limit: 515 m/s.
•
(Export licensing restricts operation to a maximum of 515 m/s)
Typical position accuracy of a differential code solution for static and kinematic
surveys:
SBAS (GPS-only): 0.6 m
•
• DGNSS: 0.25 m + 1 ppm (horizontal), 0.5 m + 1 ppm (vertical)
Accuracy (rms) with Post-Processing
Horizontal
Static (phase) 3 mm
with long
+ 0.1 ppm
observations
Static and 3 mm
rapid static
+ 0.5 ppm
(phase)
Kinematic 8 mm
(phase)
+ 1 ppm
Code
20 mm rms
0.0005 m
1
Vertical
3.5 mm
+ 0.4 ppm
5 mm
+ 0.5 ppm
15 mm
+ 1 ppm
Technical Data