LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design 58 / 106
Hot start
@open sky
Autonomous 1.8 s
XTRA enabled 3.4 s
Accuracy
(GNSS)
CEP-50
Autonomous
@open sky
<2.5 m
1. Tracking sensitivity: the minimum GNSS signal power at which the module can maintain lock (keep
positioning for at least 3 minutes continuously).
2. Reacquisition sensitivity: the minimum GNSS signal power required for the module to maintain lock
within 3 minutes after loss of lock.
3. Cold start sensitivity: the minimum GNSS signal power at which the module can fix position
successfully within 3 minutes after executing cold start command.
4.3. Layout Guidelines
The following layout guidelines should be taken into account in customers’ design.
Maximize the distance among GNSS antenna, main antenna and Rx-diversity antenna.
Digital circuits such as (U)SIM card, USB interface, camera module and display connector should be
kept away from the antennas.
Use ground vias around the GNSS trace and sensitive analog signal traces to provide coplanar
isolation and protection.
Keep the characteristic impedance for ANT_GNSS trace as 50Ω.
Please refer to Chapter 5 for GNSS antenna reference design and antenna installation information.
NOTES
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