INTRODUCTION

INTRAC-305

INTRODUCING THE INTRAC-305

The INTRAC-305 INtelligent TRacking Antenna Controller is a microprocessor based controller for tracking any nominally geostationary satellite including those at low elevation or with high angles of inclination. It has been designed as a direct physical replacement for the Andrew APC300 Steptrack Controller. For information on replacing an Andrew APC300 with the INTRAC-305 see section 6 - Installation.

The INTRAC-305 builds a model of the satellite’s orbit using a mathematical algorithm. To build the orbit model the INTRAC makes measurements by perturbing the antenna pointing angle very slightly and monitoring the change in received beacon signal strength. These small movements enable the INTRAC to estimate the position of the satellite and this estimate is used by the modelling algorithm.

The system always tracks the satellite from the orbit model. The small movements of antenna pointing are only used to maintain and update the model.

By using the model to point the antenna the INTRAC system ensures that the antenna is always pointed accurately at the satellite. This is in contrast to Step Track systems where the antenna spends most of the time not actually pointing directly at the satellite.

The regular measurements made by the INTRAC ensure that changes in the apparent orbit, due to station keeping manoeuvres or other causes, are identified. The model is modified and refined to incorporate these changes and accurate tracking is automatically maintained. The INTRAC will automatically increase the measuring rate if necessary in order to obtain sufficient information on the changing orbit.

As the INTRAC tracks using its orbit model it will continue to track the satellite if the tracking signal is degraded or lost. The satellite position may be accurately predicted from the model for up to 72hrs without a tracking signal.

The INTRAC system provides this exceptional tracking performance and robustness for satellites with any inclination, at any look angle, even in the presence of severe beacon signal degradation entirely automatically. No operator intervention or parameter setting is required when conditions or satellites are changed.

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INTRAC-305 MANUAL - ISSUE 3.2

© 2011 Advantech Wireless

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Advantech user manual Introducing the INTRAC-305, Introduction INTRAC-305