公开(公告)号：US5828957A

公开(公告)日：1998-10-27

申请号：US615937

申请日：1996-03-14

申请人： Brian W. Kroeger ,  Gregory W. Seker ,  Paul J. Peyla ,  George N. Eberl ,  Denise M. Cammarata

发明人： Brian W. Kroeger ,  Gregory W. Seker ,  Paul J. Peyla ,  George N. Eberl ,  Denise M. Cammarata

IPC分类号： H04B7/185 ,  H04Q7/00

CPC分类号： H04B7/18545 ,  H04B7/18539

摘要： An improved satellite beam acquisition and crossover technique for finding an appropriate satellite beam by searching for and acquiring a strongest pilot channel, searching for signalling channels on the acquired strongest pilot channel and monitoring the acquired signalling channel. Beam acquisition of a continuous wave pilot as in the preferred embodiment is faster and more reliable than beam acquisition of a modulated channel. Moreover, the acquired pilot channel can be used to unambiguously precalibrate the frequency reference of the mobile terminal. Also, acquisition of the pilot ensures that the corresponding satellite beam is not blocked or shadowed immediately prior to searching for a signalling channel, which significantly improves the reliability while reducing the time required for the search process. Mitigation of fading and shadowing is provided by using fast attack, slow decay non-linear filtering.

摘要翻译： 通过搜索和获取最强导频信道，搜索所获得的最强导频信道上的信令信道并监测所获取的信令信道，来改进卫星波束获取和交叉技术，以找到适当的卫星波束。 如在优选实施例中的连续波导导的光束采集比调制信道的光束采集更快更可靠。 此外，获取的导频信道可以用于明确地预校准移动终端的频率参考。 此外，采集导频确保相应的卫星波束在搜索信令信道之前不被立即阻塞或遮蔽，这显着提高了可靠性，同时减少了搜索过程所需的时间。 通过使用快速攻击，慢衰减非线性滤波来提供衰减和遮蔽的缓解。