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50 SMART-AG User Manual Rev 2
Appendix A Technical Specifications
A.1 Smart-AG Receiver Performance
PERFORMANCE (Subject To GPS System Characteristics)
Position Accuracy
a
Standalone:
L1 1.8 m RMS
SBAS
b
0.6 m RMS
DGPS 0.45 m RMS
RT-20 0.20 m RMS
Post Processed 5 mm + 1 ppm RMS
Time To First Fix
Hot: 35 s
(Almanac and recent ephemeris saved and approximate position)
Warm: 40 s (Almanac, approximate position and time, no recent ephemeris)
Cold: 65 s
(No almanac or ephemeris and no approximate position or time)
Reacquisition
0.5 s L1 (typical)
Data Rates
Raw
Measurements: 20 Hz
Computed
Position: 20 Hz
Time Accuracy
a c
20 ns RMS
Velocity Accuracy
0.03 m/s RMS
Measurement Precision
C/A code phase 6 cm RMS
L1 carrier phase:
Differential 0.75 mm RMS
Dynamics
Velocity 515 m/s
d
a. Typical values. Performance specifications are subject to GPS system characteristics, U.S. DOD operational degradation,
ionospheric and tropospheric conditions, satellite geometry, baseline length and multipath effects.
b. GPS-only
c. Time accuracy does not include biases due to RF or antenna delay.
d. In accordance with export licensing.