Smart Machine Smart Decision
SIM7600E_SIM7600E-H-PCIE_Hardware_Design_V1.00 31 2017-11-23
GLONASS: 1597.5~1605.8 MHz
BD: 1559.05~1563.14 MHz
Update rate: Default 1 Hz
GNSS data format: NMEA-0183
GNSS Current consumption : 100mA (GSM/UMTS/LTE Sleep ,in total on VBAT pins)
GNSS antenna: Passive/Active antenna
It is suggested either the external LNA or active antenna used. It is not needed for both of them at the same
time.
Note: Performance will vary depending on the environment, antenna type and signal conditions and so on.
5.3.2 GNSS Operate Mode
SIM7600E-PCIE supports both A-GPS and S-GPS, and then provides three operating modes: mobile-assisted
mode, mobile-based mode and standalone mode. A-GPS includes mobile-assisted and mobile-based mode.
In mobile-assisted mode, when a request for position location is issued, available network information is provided
to the location server (e.g. Cell-ID) and assistance is requested from the location server. The location server sends
the assistance information to the handset. The handset/mobile unit measures the GNSS observables and provides
the GNSS measurements along with available network data (that is appropriate for the given air interface
technology) to the location server. The location server then calculates the position location and returns results to
the requesting entity.
In mobile-based mode, the assistant data provided by the location server encompasses not only the information
required to assist the handset in measuring the satellite signals, but also the information required to calculate the
handset’s position. Therefore, rather than provide the GNSS measurements and available network data back to
the location server, the mobile calculates the location on the handset and passes the result to the requesting entity.
In standalone (autonomous) mode, the handset demodulates the data directly from the GNSS satellites. This
mode has some reduced cold-start sensitivity, and a longer time to first fix as compared to the assisted modes.
However, it requires no server interaction and works out of network coverage.
This combination of GNSS measurements and available network information provides:
● High-sensitivity solution that works in all terrains: Indoor, outdoor, urban, and rural
● High availability that is enabled by using both satellite and network information
Therefore, while network solutions typically perform poorly in rural areas and areas of poor cell geometry/density,
and while unassisted, GNSS-only solutions typically perform poorly indoors. The SIM7600E-PCIE GNSS
solution provides optimal time to fix, accuracy, sensitivity, availability, and reduced network utilization in both of
these environments, depending on the given condition.
GNSS can be used by NMEA port. User can select NMEA as output through UART or USB. NMEA
sentences are automatic and no command is provided. NMEA sentences include GSV, GGA, RMC, GSA, and
V T G. B e f o re using GNSS, user should configure SIM7600E-PCIE in proper operating mode by AT command.
Please refer to related document for details. SIM7600E-PCIE can also get position location information through
AT directly.
5.3.3 Application Guide
Users can adopt an active antenna as GNSS signal receiver. The following is the reference circuit.
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