LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design 70 / 130
1. Tracking sensitivity: the lowest GNSS signal value at the antenna port on which the module can keep
on positioning for 3 minutes.
2. Reacquisition sensitivity: the lowest GNSS signal value at the antenna port on which the module can
fix position again within 3 minutes after loss of lock.
3. Cold start sensitivity: the lowest GNSS signal value at the antenna port on which the module fixes
position within 3 minutes after executing cold start command.
4.3. Layout Guidelines
The following layout guidelines should be taken into account in customers’ designs.
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 50Ω characteristic impedance for the ANT_GNSS trace.
Please refer to Chapter 5 for GNSS antenna reference design and antenna installation information.
Hot start
@open sky
Autonomous 2.5 s
XTRA enabled 1.8 s
Accuracy
(GNSS)
CEP-50
Autonomous
@open sky
<2.5 m
NOTES
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