Product Info

Smart LTE Module Series
SC20 Hardware Design
SC20_Hardware_Design 72 / 130
5 GNSS
SC20 module integrates a Qualcomm IZat™ GNSS engine (GEN 8C) which supports multiple positioning
and navigation systems including GPS, GLONASS and BeiDou. With an embedded LNA, the module
provides greatly improved positioning accuracy.
5.1. GNSS Performance
The following table lists the GNSS performance of SC20 module in conduction mode.
Table 29: GNSS Performance
5.2. GNSS RF Design Guidelines
Bad design of antenna and layout may cause reduced GPS receiving sensitivity, longer GPS positioning
time, or reduced positioning accuracy. In order to avoid this, please follow the reference design rules as
below:
Parameter
Description
Typ.
Unit
Sensitivity (GNSS)
Cold start
-146
dBm
Reacquisition
-157
dBm
Tracking
-157
dBm
TTFF (GNSS)
Cold start
32
s
Warm start
30
s
Hot start
2
s
Static Drift (GNSS)
CEP-50
6
m