Stabilized antennas: Two gyros - better performance

A ship rolling and pitching in the sea proves to be a difficult dynamic environment. Marine satellite antennas require gyro stabilization in order to accurately receive and transmit data. These stabilized antennas can only accommodate a small amount of pointing error before being rendered unable to communicate with the satellite.

To guarantee highest network availability for broadband services in difficult conditions, EPAK has developed the Evolution Series, a satellite tracking system that combines the patented EBF (Electronic Beamforming) gyro with a 3D gyro module.

The combination of these tracking systems is a (r-)evolutionary step that significantly increases the accuracy and connection stability, resulting in a seamless and uninterrupted signal - regardless of weather conditions.

EPAK Satellite Tracking Accuracy
After a signal blockage of 3 minutes, the EVO stabilized system can re-acquire the signal 30 times faster than conventional antennas.
The combination of two gyros improves EPAK's satellite tracking functionality
While the EBF Gyro (red + yellow) allows an excellent pointing accuracy within a narrow angle around the beam's centre (red + yellow), the 3D gyro module (blue) has an unlimited tracking range. In combination they make the Evolution System both accurate and stable.

The EBF gyro Tracking provides the highest accuracy. With an update rate of 80 times per second, the TX lobe is pointed to the satellite centre at all times.

The 3D gyro provides stability and high reliability for a fast recovery if the EBF tracking has been interrupted by a signal blockage caused by obstacles between the antenna and the satellite.

Test result for high performing stabilized antenna
Probability Distribution Function (PDF) for depointing of azimuth axis.

Test result for high performing stabilized antenna
Probability Distribution Function (PDF) for depointing of elevation axis.

The graphs above show the excellent pointing accuracy of an EPAK antenna which is within 0.2 degrees of the signal centre or better. The test was performed on a simulator at the Fraunhofer Institute. The profile used for this test is the Maritime Motion Profile “Class A”, the most heavy pattern specified by the Global VSAT forum.

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