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公开(公告)号：US4250454A
公开(公告)日：1981-02-10
申请号：US23823
申请日：1979-03-26
申请人： Norman Y. Sakamoto
发明人： Norman Y. Sakamoto
CPC分类号： H03L7/0812 , G01R25/08 , G01S7/282
摘要： An electronic trigger circuit for an RF source, which electronic trigger may be advantageously used in a radar apparatus, for instance. The trigger employs digital logic devices including a register or counter, a circuit for initiating counting in the register in response to a received pretrigger signal and a circuit responsive to the occurrence of selected count in the register for enabling the RF source. A timing signal is generated, based upon the pretrigger signal in timed relationship to the time at which the RF source should nominally generate its RF signal. Typically, the RF source generates its RF signal at sometime after being enabled. A comparator circuit is provided for comparing the phase relationship of the aforementioned timing signal and the occurrence of the RF signal and is in turn coupled to an arithmetic circuit effective for altering the number of states through which the register counts. Preferably, the arithmetic circuit alters the number of states only when the comparison circuit indicates that the phase relationship differs by some preselected period of time. Thus, each time the RF source is fired, its output is compared with the time at which the output should nominally occur and when this difference exceeds a predetermined amount, the amount of delay between the time the pretrigger signal is received and the time the RF source is enabled is varied by changing the number of states through which the aforementioned register counts.
摘要翻译： 例如，用于RF源的电子触发电路，该电子触发器可以有利地用于雷达装置中。 触发器采用包括寄存器或计数器的数字逻辑器件，用于响应于接收到的预触发信号而在寄存器中启动计数的电路和响应于寄存器中选择的计数的发生的电路以使能RF源。 基于与RF信号源名义上产生其RF信号的时间的定时关系的预触发信号，产生定时信号。 通常，RF源在启用后的某个时间产生其RF信号。 提供比较器电路，用于比较上述定时信号的相位关系和RF信号的出现，并且又连接到有效地改变寄存器计数的状态数量的运算电路。 优选地，只有当比较电路指示相位关系不同预定时间段时，算术电路才改变状态数。 因此，每当RF源被点亮时，其输出与输出应该名义上出现的时间进行比较，并且当该差异超过预定量时，接收到预触发信号的时间与RF之间的时间 源使能是通过改变上述寄存器计数的状态数来改变的。
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