Leica GR50 - Measurement Precision and Position Accuracy; GPS Carrier and Code Tracking; GNSS Measurements and Accuracy

GR30/GM30/GR50, Technical Data
63
GPS Carrier tracking
GPS code
measurements
Code smoothing using carrier phase measurements is optional.
9.1.2 Measurement Precision and Position Accuracy

Measurement precision, accuracy in position and height, reliability and time for initial-
isation are dependent upon various factors including the number of satellites 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 measure-
ments processed using receiver firmware, LEICA Geo Office and the Bernese Software.
The use of multiple GNSS systems can increase accuracy by up to 30% relative to GPS
only.
GNSS
measurements
Fully independent code and phase measurements of all frequencies.
1
For satellites with SNR higher than 42 dB-Hz; Galileo and BeiDou values are expected
to be similar.
Accuracy (rms)
single receiver
navigation mode
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)
Accuracy in
differential code
mode
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)
Condition GR30/GM30/GR50
L1, AS off or on Reconstructed carrier phase via C/A-code.
L2, AS off Reconstructed carrier phase via P2-code.
L2, AS on Switches automatically to patented P-code aided technique
providing full L2 reconstructed carrier phase.
Condition GR30/GM30/GR50
L1, AS off
L1, AS on
Code measurements: C/A-code.
L2, AS off Code measurements: P2-code and/or L2C code.
L2, AS on Code measurements: Patented P-code aided code and/or L2C
code.
Phase Code
Precision
1
GPS L1/L2/L5
0.2 mm rms 20 mm rms
Resolution 0.01 mm 0.0005 m