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    Noise adaptive correlator
    2.
    发明授权
    Noise adaptive correlator 失效
    噪声自适应相关器

    公开(公告)号：US4234883A

    公开(公告)日：1980-11-18

    申请号：US509708

    申请日：1974-09-26

    申请人： Oscar J. Kaelin ,  Richard H. Mathews

    发明人： Oscar J. Kaelin ,  Richard H. Mathews

    IPC分类号： H04B1/10 ,  H04L7/00 ,  H04B7/00

    CPC分类号： H04B1/1036 ,  H04L7/0083

    摘要： Time-correlation apparatus for collecting correlation data when the noise level is low and inhibiting the collection of correlation data when the noise level is high without losing valid correlation data which has already been obtained. An incoming signal is checked for data pulses during each correlation measurement pulse of a synchronizing signal. The correlation measurement pulses are counted by a first counter, and the coincidences of data pulses and correlation measurement pulses are counted by a second counter. A noise monitor samples the incoming signals 100 times during each of a continuous series of noise analysis periods and counts the number of times the signal (assumed to be noise) exceeds a predetermined threshold. A high noise signal is generated if the threshold is exceeded 30 or more times, and a low noise signal if it is exceeded less than 30 times. A low noise signal at the end of a noise analysis period causes the counts in the first and second counters to be loaded into first and second buffers, respectively. A high noise signal at the end of a noise analysis period causes the counts in the first and second buffers to be loaded into the first and second counters, respectively, in place of the counts therein. Thus, if there is a low noise level during a noise analysis period, correlation data is collected. If there is a high noise level during a noise analysis period, correlation data collected during that period is dumped but previously collected data is retained. When the count of correlation measurement pulses in the first counter reaches 100, the count of coincidences in the second counter is read out as a measure of the degree of correlation between the incoming signal and the synchronizing signal.

    摘要翻译： 时间相关装置，用于当噪声电平低时收集相关数据，并且当噪声电平较高时禁止收集相关数据，而不会丢失已经获得的有效相关数据。 在同步信号的每个相关测量脉冲期间检查输入信号的数据脉冲。 相关测量脉冲由第一计数器计数，数据脉冲和相关测量脉冲的重合由第二计数器计数。 噪声监测器在连续的一系列噪声分析周期期间对输入信号进行100次采样，并对信号（假设为噪声）超过预定阈值的次数进行计数。 如果阈值超过30次以上，则产生高噪声信号，如果超过30次，则产生低噪声信号。 在噪声分析周期结束时的低噪声信号使得第一和第二计数器中的计数分别被加载到第一和第二缓冲器中。 在噪声分析周期结束时的高噪声信号使得第一和第二缓冲器中的计数分别被加载到第一和第二计数器中，代替其中的计数。 因此，如果在噪声分析期间存在低噪声电平，则收集相关数据。 如果在噪声分析期间存在高噪声电平，则在该期间收集的相关数据被转储，但是先前收集的数据被保留。 当第一计数器中的相关测量脉冲的计数达到100时，读出第二计数器中的重合计数作为输入信号和同步信号之间的相关程度的量度。