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    • 8. 发明申请
    • Fixed User Terminal for Inclined Orbit Satellite Operation
    • 用于倾斜轨道卫星操作的固定用户终端
    • US20110032143A1
    • 2011-02-10
    • US12848960
    • 2010-08-02
    • Yulan SunDonald D. C. ChangFrank Lu
    • Yulan SunDonald D. C. ChangFrank Lu
    • H04B7/185
    • 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.
    • 实现了能够同时跟踪多个倾斜轨道卫星的高级多波束固定接地终端,增加并抑制多个方向的增益。 配备数字波束形成和零点成形技术的固定用户终端可以同时跟踪和识别来自多个倾斜轨道卫星的信号。 这种技术使对地静止卫星漂移到倾斜的轨道,而不会与接地终端的通信丢失,这不仅增加了倾斜轨道卫星的寿命,而且减轻了地球静止轨道的稀缺性。 在极端情况下,卫星可以放置在同一个槽中,这进一步增强了地球同步轨道的使用。 另一个本发明是从空值的宽度比单个空值宽得多的双零点。 较宽的零点增加了系统对频率漂移和信号方向变化的鲁棒性,从而通过降低更新波束矢量来降低系统的复杂性。 要在较宽的频率范围内使用相同的波束矢量,需要根据系统要求设计FIR滤波器。