LN920 HW Design Guide
1VV0301730 Rev. 1
Page 58 of 81
2021-08-11
Not Subject to NDA
GNSS Antenna Requirements
For most applications, it is recommented to use an active GNSS antenna.
8.3.1.
GNSS Antenna Specifications
Item
Value
Frequency range
1559.0 ~ 1610.0 MHz
Gain
15 ~ 30dB
Impedance
50 ohm
Noise Figure of LNA
< 1.5 (recommended)
DC supply voltage
DC 1.8 ~ 3.3V
VSWR
≤
3:1 (recommended)
Table 29: GNSS Antenna specification
8.3.2.
GNSS Antenna
–
Installation Guidelines
•
The antenna must be installed according to the antenna manufacturer’s i
nstructions
to obtain the maximum performance from the GNSS receiver.
•
The position of the antenna must be carefully evaluated if operating in conjunction
with any other antenna or transmitter.
•
The antenna must not be installed inside metal cases or near any obstacle that may
degrade features such as antenna lobes and gain.
GNSS Characteristics
The table below specifies the GNSS characteristics and expected performance.
Note: In case of GNSS antenna placed close to the module, a 15dB
gain is sufficient. In case of long RF cable the gain must be increased
up to 30dB.
Parameters
Typical Measurement
Sensitivity
Tracking Sensitivity
TBD
Navigation
TBD
Cold Start
TBD
