SmartFlex SR305
7.5
Technical parameters of GNSS
GPS specifications
Antenna
50 Ohms – active
Protocols
NMEA 0183 v3.0
Frequency GPS
1575.42 MHz Typical
Frequency GLONASS
1597.551 MHz Min.; 1605.886 MHz Max.
Tracking Sensitivity
∗
(Open sky)
Active antenna or LNA: -159 dBm
Passive antenna: -156 dBm
Acquisition Sensitivity
∗∗
(Open sky)
Active antenna or LNA: -149 dBm
Passive antenna: -145 dBm
Cold Start Sensitivity
-145 dBm
Acquisition time (TTFF)
Warm start: 29 s Max.
Cold start: 32 s Max.
Table 33: Technical parameters of GNSS
∗
Tracking sensitivity is the lowest GNSS signal level for which the device can still detect an
in-view satellite 98 % of the time when in sequential tracking mode.
∗∗
Acquisition sensitivity is the lowest GNSS signal level for which the device can still detect
an in-view satellite 50 % of the time.
48