ST 6100 - HARDWARE GUIDE
Parameter GPS GLONASS BeiDou GPS/GLONASS GPS/BeiDou
Accuracy
Horizontal Position
(CEP)
1
2.5/2.0 m 4.0 m 3.0 m 2.5/2.0 m 2.5/2.0 m
Velocity 0.05 m/s 0.1 m/s 0.1 m/s 0.05 m/s 0.05 m/s
Heading 0.3 degrees 0.4 degrees - 0.3 degrees 0.3 degrees
3.8 Accelerometer
The terminal has an internal 3D accelerometer to detect motion in any axis. Figure 13 shows the positive axes for the
accelerometer.
Figure 13: Accelerometer Axis
The accelerometer is very important for low power terminals when it is critical to save power while stationary and
quickly detect when motion starts. In powered terminals where low power is not critical, GPS can be polled to detect
motion. However, for low power applications frequent GPS fixes can dominate the power budget. To reduce power
budget effects of GPS fixes, an accelerometer can be used to trigger a GPS fix to detect if motion occurred.
The accelerometer thresholds to detect motion vary depending on the environment. In order to avoid, false motion
detects, extensive testing is required to ensure that adequate acceleration magnitude thresholds and time durations
are used. Refer to [T405] for further details about the accelerometer.
1
CEP, 50%, 24 hours static, -130 dBm
T406, VERSION 01
25
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