Product Info

LTE Standard Module Series

EC25 Series Hardware Design

EC25_Series_Hardware_Design 72 / 134

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’ 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 50 Ω 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

XTRA enabled

1.8

Accuracy

(GNSS)

CEP-50

Autonomous

@ open sky

<2.5

NOTES