Hardware+Design V1.07

Smart Machine Smart Decision
T(zdout)
Delay from PCM_CLK falling to PCM_DOUT
HIGH-Z
– 160 – ns
Note: SIM5320 can transmit PCM data by USB except for PCM interface. Please refer to document [22] for more
information of PCM Application Note.
3.12 Global Positioning System
SIM5320 merges GPS 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 GPS receivers fail, and provides a platform to enable
wireless operators to address both location-based services and emergency mandates.
3.12.1 Technical specification
Tracking sensitivity -157 dBm
Cold-start sensitivity -144 dBm
Accuracy (Open Sky) <2m (CEP50)
TTFF (Open Sky) Hot start <1s Cold start 35s（good signal）/ 100s(weak signal)
Receiver Type 16-channel, GPS L1 Frequency (1575.42MHz), C/A Code
Update rate Default 1 Hz
GPS data format NMEA-0183
GPS Current consumption (WCDMA/GSM Sleep mode) 100mA (Total supply current)
GPS antenna Passive/Active antenna
Note: Performance will vary depending on the environment, antenna type and signal conditions and so on.
3.12.2 Operate Mode
SIM5320 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 GPS
observables and provides the GPS 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 GPS measurements and
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