Sierra Wireless AirLink FX100, Руководство пользователя

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4112221 Rev 7.2 June 19, 2013 47
User Guide Interfaces
The FX100 GPS antenna must meet the requirements specified in the table below.
Table 35. GPS Antenna Specifications for FX100
Characteristic GPS L1
RX Frequency 1575.42 MHz
RF Impedance
50
Ω
VSWR Rx max 1.5:1
LNA Bias Voltage 5V
LNA Current
Consumption
40mA MAX
Polarization Linear, vertical
Typical radiated
gain
0dBi in one direction at least
5.2.2.3. GPS Specifications for FX100
Note: These specifications are preliminary targets that are subject to change without notice. Actual GPS
functionality depends on the firmware version and module configuration.
The FX100 provides the GPS features listed in the following sub-sections. This GPS feature can be
used through AT commands provided by the Extended Open AT application (which is pre-loaded at
the factory) or from a custom Open AT application using Location Library.
5.2.2.3.1. Standalone GPS

Leading standalone/autonomous GPS performance

-145 dBm cold start sensitivity

-153 dBm hot start sensitivity

-155 dBm tracking sensitivity

< 45 second average cold start TTFF (Time To First Fix) in open air

< 3 second average super hot TTFF in open sky

< 10 m accuracy in open sky
Note: For optimum performance, the modem should be registered on the GSM/UMTS network, but does
not need to be on an active data or voice call.
5.2.2.3.2. gpsOneXTRA
TM

Enables enhanced standalone GPS operation by downloading < 40 kB file from a server on
the Internet

Performance closer to UE-based operation than traditional standalone GPS operation

Best if downloaded once every 1
–2 days, but valid for up to 7 days with some accuracy
degradation