MEIG SLM770A - Gnss; Basic Description; GNSS Performance; Layout Guide

SLM770A Module Hardware Design Manual
MeiG Smart Technology Co., Ltd 77/77
4 GNSS
4.1 Basic Description
The SLM770A includes a complete built-in GNSS solution that supports Qualcomm Gen8C-Lite (GPS,
GLONASS, BeiDou).
SLM770A modules support the standard NMEA-0183 protocol and output 1Hz NMEA statements via
USB interface by default.
4.2 GNSS performance
The following table lists the GNSS performance of SLM770A module.
Table 22 GNSS performance list
Parameter
Description
Performance index
Positioning accuracy (open)
CEP-50
<5m
First positioning time TTFF (open)
Cold start
32s
Warm start
29s
Hot start
2s
Sensitivity
Cold star
-146dBm
Capturing
-157dBm
Tracking
-157dBm
4.3 Layout guide
Follow the layout guide in the below when designing: