公开(公告)号：US3900850A

公开(公告)日：1975-08-19

申请号：US80977869

申请日：1969-03-24

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： ULMAN LYNN J ,  GREEN RAYMOND G

IPC: G01S7/02 ,  G01S13/70 ,  G01S9/14

CPC classification number: G01S13/70 ,  G01S7/021

Abstract: A pulse train tracking system completely digital in operation is capable of tracking pulse trains in a dense signal environment. An acquisition circuit determines the existence of a unique pulse combination by measurement of the interpulse period between successive pulses within a preselected range of minimum and maximum interpulse periods. Acquired pulse trains are tracked by an available one of several tracking circuits, adapted to individually track different pulse trains of the same or different pulse repetition frequencies. The trackers predict the interpulse period, for a train being tracked and define a gate within which the predicted pulse should occur. The trackers correct the phasing of the gate relative to a received pulse within each period and correct the predicted inter-pulse period at a proportioned rate. Tracking is maintained in the absence of pulses for a preselected number of interpulse periods.

Abstract translation: 完全数字化的脉冲序列跟踪系统能够在密集信号环境中跟踪脉冲串。 采集电路通过测量在最小和最大脉冲间期间的预选范围内的连续脉冲之间的脉冲间隔来确定唯一脉冲组合的存在。 获取的脉冲串由几个跟踪电路中的一个跟踪，适用于单独跟踪相同或不同脉冲重复频率的不同脉冲串。 跟踪器预测脉冲周期，对于正在被跟踪的列车并且定义预定脉冲应在其中发生的门。 跟踪器在每个周期内校正门相对于接收脉冲的相位，并以比例的速率校正预测的脉冲间周期。 在不存在用于预选数量的脉冲间隔的脉冲的情况下维持跟踪。