Specifications

Smart Machine Smart Decision
SIM7080G _Hardware Design _V1.03 45 2019-12-13
4.3 GNSS
SIM7080G merges GNSS(GPS/GLONASS/BD) satellite and network information to provide a
high-availability solution that offers industry-leading accuracy and performance. This solution
performs well, even in very challenging environmental conditions where conventional GNSS
receivers fail, and provides a platform to enable wireless operators to address both location-based
services and emergency mandates.
4.3.1 GNSS Technical specification
 Tracking sensitivity: -159 dBm（GPS）/ TBD dBm（GLONASS）/TBD (BD)
 Cold-start sensitivity: -148.5 dBm
 Accuracy (Open Sky): 0.74m (CEP50)
 TTFF (Open Sky) : Hot start <1s, Cold start<30s
 Receiver Type: 16-channel, C/A Code
 GNSS L1 Frequency: 1575.42±1.023MHz
 GLONASS: 1597.5~1605.8 MHz
 BD: 1559.05~1563.14 MHz
 Galileo L1:1575.42±1.023MHz
 Update rate: Default 1 Hz
 GNSS data format: NMEA-0183
 GNSS Current consumption :16mA (GSM/LTE Sleep, in total on VBAT pins)
 GNSS antenna: Passive/Active antenna
Note: If the antenna is active type, the power should be given by main board because there is no
power supply on the GNSS antenna pad. If the antenna is passive,it is suggested that the external
LNA should be used.
4.3.2 GNSS Application Guide
Users can adopt an active antenna or a passive antenna to SIM7080G. If using a passive antenna,
an external LNA is a must to get better performance. The following figures are the reference
circuits.
MODULE
GNSS_ANT
GND
GND
Matching circuit
GNSS Active ANT
L1
C1
47nH
C2
L2
10 ohm
33pF
VDD
Figure 28: Active antenna circuit