ELLIPSE2 AHRS & INS
– Hardware Manual
ELLIPSE2HM.1.3
2.2.9. GPS antenna connector (Ellipse-N and D)
To connect an external GNSS antenna, the Ellipse-N includes an IP-68 SMA connector. The Ellipse-D includes
two of these connectors. The internal GNSS receiver only supports active GNSS antennas.
Please be advise that the Ellipse doesn't implement any lightning protection. The GPS antenna and cable
are very sensitive to strikes and a proper installation with lightning protection devices may be required.
Note: For best performance, the antenna(s) should be connected before the power is applied. The
Ellipse GPS estimates the noise floor of the antenna during the startup sequence.
2.2.9.1. GPS antenna advice for Ellipse-N
The Ellipse-N embeds a high sensitivity GNSS receiver that supports L1 GPS and GLONASS signals. For best
performance and robustness, please use low noise and high gain active GPS antennas that support the
frequencies band you are planning to use.
Recommended electrical specifications from -40°C to 85°C.
Parameter
Specifications
Remark, conditions
Antenna connector
SMA female
IP-68 when connected
Input impedance
50 Ω
LNA supply voltage
3.0 VDC
LNA supply current
< 20 mA
RF input frequencies
GPS L1:
GLONASS L1:
Beidou B1:
1575.42 MHz
1596 – 1610 MHz
1561.098 MHz
Minimum gain
15 dB
Maximum gain
50 dB
Maximum noise figure
<< 1.5 dB
Table 1: GNSS antenna requirements
SBG Systems has selected some high quality GPS antennas for different applications. Please refer to the
section 5.5 GNSS antennas to get more details on available antennas.
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Figure 2.25: SMA antenna connector
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