User's Manual

0
LTE Module
EC25-A User Manual
EC25-A_User_Manual Confidential / Released 46 / 7
Hot start
@open sky
Autonomous
TBD
s
XTRA enabled
TBD
s
Accuracy
(GNSS)
CEP-50
Autonomous
@open sky
TBD
m
1. Tracking sensitivity: the lowest GPS signal value at the antenna port for which the module can keep
on positioning for 3 minutes.
2. Reacquisition sensitivity: the lowest GPS signal value at the antenna port for which the module can
fix position again within 3 minutes after loss of lock.
3. Cold start sensitivity: the lowest GPS signal value at the antenna port for which the module fixes
position within 3 minutes after executing cold start command.
4.3. Layout Guideline
The following layout guideline should be taken into account in your design.
 Maximize the distance between the GNSS antenna, the main antenna and the Rx-diversity antenna.
 Digital circuits such as USIM card, USB interface, Camera module, Display connector and SD card
should be kept away from the antenna.
 Use ground vias around the GNSS trace and sensitive analog signal traces to provide coplanar
isolation and protection.
 Keep 50ohm characteristic impedance for the ANT_GNSS trace.
Refer to Chapter 5 for GNSS reference design and antenna consideration.
NOTES