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Abstract

An advanced multiple-beam fixed ground terminal is achieved that is capable of simultaneously tracking multiple inclined orbit satellites, increasing and suppressing gain in multiple directions. The fixed user terminal equipped with digital beam-forming and null-forming technique can track and identify signals from multiple inclined orbit satellites at the same time. This technique enables a geostationary satellite drift to an inclined orbit without losing communication with ground terminals which not only increase the life span of an inclined orbit satellite, but also relieve the scarcity of geo-stationary orbit. In extreme cases, satellite can be placed in the same slot which further enhanced the usage of geosynchronous orbits. Another present invention is to from double nulls whose null width is much wider than a single null. A wider null increases the system robustness to frequency drift and change of signal direction, thus in turn reduce the system's complexity by lowering update beam wave vectors. To use the same beam wave vector on wider frequency spans, an FIR filter need to be designed according to system requirements.

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First Claim