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Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCOGENER reserves the right to make any modifications.
Dct_427_02
8.2.11.1 GSM external antenna
The GSM external antenna is connected to the modem via the FAKRA-D connector.
The external antenna must have the characteristics described in the table below.
Table 66 : Characteristics of the GSM external antenna
Frequency band
GSM 900
880..960 MHz
GSM 1800
1710..1880 MHz
GSM 850
824..894 MHz
GSM 1900
1850..1990 MHz
Impedance
50 Ohms nominal
Input power
> 2 W peak
Gain
< 3 dBi
VSWR
< 2:1 recommended
< 3:1 acceptable
Return Loss
S
11
<-10 dB recommended
S
11
<-6 dB acceptable
See § 10 Recommended accessories , for the GSM antennas recommended by
ERCOGENER.
8.2.12 GPS characteristics
8.2.12.1 GPS functioning
The manufacturer GPS performances are given in the table below.
Table 67 : GPS parameters
Parameters
Specifications
Kind of reception
Frequency L1 C/A Code
– 50 channels
Time To First Fix
1
Cold Start (Autonomous)
27 s
Warm Start (Autonomous)
27 s
Hot Start (Autonomous)
< 1s
Aided Starts
2
< 3 s
Sensibility
3
Tracking & Navigation
-161 dBm
Reacquisition
-160 dBm
Cold Start (Autonomous)
-147 dBm
Horizontal Position Accuracy
4
Autonomous
< 2.5 m
SBAS
< 2.0 m
Max Navigation Update Rate
5 Hz
Velocity Accuracy
5
0.1 m/s
Heading Accuracy
5
0.5 degrees
Dynamics
≤ 4 g
Operational Limits Velocity
500 m/s
1
All satellites at -130 dB
2
Dependent on aiding data connection speed and latency
3
Demonstrated with a good active antenna
4
Under good GPS signal conditions
5
Assuming Airborne <4g platform