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    • 12. 发明授权
    • System and method for narrowing the range of frequency uncertainty of a doppler shifted signal
    • 用于缩小多普勒偏移信号的频率不确定度范围的系统和方法
    • US06831940B2
    • 2004-12-14
    • US09885755
    • 2001-06-19
    • Brian HarmsSherman A. GregoryBrian K. ButlerAvneesh Agrawal
    • Brian HarmsSherman A. GregoryBrian K. ButlerAvneesh Agrawal
    • H04B1500
    • H04B7/216G01S19/29H04B1/707H04L2027/0034
    • A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system with relative signal source and receiver motion. The satellite communications system includes a user terminal (for example, a mobile wireless telephone), a gateway (terrestrial base station), and at least one satellite with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses, coherently accumulating samples of the pilot signal over a plurality of chips, measuring the energy of the accumulated pilot signal samples, accumulating the energy measurements over a plurality of chips to produce an energy accumulation value, and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value.
    • 一种用于在具有相对信号源和接收机运动的卫星或其他通信系统中缩小多普勒频移导频信号的频率不确定度的范围的系统和方法。 卫星通信系统包括用户终端(例如,移动无线电话),网关(地面基站)和至少一个具有未知位置和未知相对速度的卫星。 该方法包括以下步骤:通过多个频率假设移位导频信号,通过多个码片相干累加导频信号的采样,测量累积的导频信号样本的能量,将多个码片上的能量测量累积到 产生能量累积值,并且确定多个频率假设中的哪一个导致最高的能量积累值。