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5. GNSS Specification
The AirPrime AR7558 embedded module includes optional Global Navigation Satellite System
(GNSS) capabilities via the Qualcomm gpsOne Gen8 Engine, capable of operation in assisted and
stand-alone GPS modes as well as GPS+GLONASS mode.
5.1.
GNSS
The GNSS implementation supports GPS L1 operation and GLONASS L1 FDMA operation.
Table 20.
GNSS Characteristics
Parameter
Standalone or MS Based Tracking Sensitivity
Sensitivity
Cold Start Sensitivity
MS Assisted Synchronous A-GNSS Acquisition Sensitivity
Accuracy in Open Sky (1 Hz tracking)
Total number of SV available
Support for Predicted Orbits
Predicted Orbit CEP-50 Accuracy
Standalone Time To First Fix (TTFF)
Number of channels
GNSS Message Protocols
Note:
Acquisition/Tracking Sensitivity performance figures assume open sky w/ active patch GNSS
antenna and a 2.5 dB Noise Figure.
5.2.
GNSS Antenna Interface
The specification for GNSS Antenna Interface is defined in the table below. The AirPrime AR7558
provides biasing for an active antenna as well as onboard circuitry for diagnostics of this antenna
interface.
Table 21.
GNSS Antenna Interface Characteristics
Characteristics
Frequency
RF Impedance
VSWR max
LNA Bias Voltage
LNA Current Consumption
Maximum Voltage applied to antenna
4116922
Super Hot
Warm
Cold
GPS L1 (Wideband)
Glonass L1 FDMA
RX
Rev 1.0
GNSS
1575.42 ± 20 MHz
1597.5 – 1605.8 MHz
50 Ω
2:1
4.4 – 4.9V, 5.25V (No Load)
50 mA Max
36 Volts
Value
tbd
tbd
tbd
< 2m CEP-50
~30 SVs
Yes
5 m
1 s
29 s
32 s
tbd
NMEA
January 21, 2015
24
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