User's Manual

Smart Machine Smart Decision
SIM868_Hardware_Design_V1.00 12 2016-06-20
Table 3: GNSS engine Performance
Parameter Description
Performance
Min Type Max Unit
Horizontal Position
Accuracy
(1)
Autonomous <2.5 m
Velocity Accuracy
(2)
Without Aid 0.1 m/s
DGPS 0.05 m/s
Acceleration Accuracy
Without Aid 0.1 m/s
2
DGPS 0.05 m/s
2
Timing Accuracy 10 nS
Backup batter voltage V_BACKUP 2.3 4.3 V
Dynamic Performance
Maximum Altitude 18000 m
Maximum Velocity 515 m/s
Maximum Acceleration 4 G
TTFF with GPS
only
(3)
Hot start 0.7 s
Warm start 21.4 s
Cold start 22.3 s
TTFF with
GLONASS only
(3)
Hot start 0.7 s
Warm start 21.2 s
Cold start 21.68 s
TTFF with GPS and
GLONASS
(3)
Hot start 0.6 s
Warm start 21.54 s
Cold start 21.67 s
A-GPS TTFF(EPO in
flash mode)
Hot start 0.6 s
Warm start 21.32 s
Cold start 22.17 s
Sensitivity with GPS
only mode
Autonomous
acquisition(cold start)
-148 dBm
Re-acquisition -158 dBm
Tracking -166 dBm
Sensitivity with
GLONASS only mode
Autonomous
acquisition(cold start)
-147 dBm
Re-acquisition -155 dBm
Tracking -160 dBm
Sensitivity with GPS
and GLONASS
Autonomous
acquisition(cold start)
-149 dBm
Re-acquisition -157 dBm
Tracking -162 dBm
Receiver
Channels 22/66
Update rate 5 Hz
Tracking L1, CA Code
Protocol support