Research on a precise synchronous close-loop monitoring system technology
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摘要: 研制了一种具有同步时序闭环监控的精密同步机，该同步机输出光同步信号，采用单光纤反馈光模块传输同步信号、基于内插法的时间间隔测量方法，能高精度测量反馈的光同步信号与基准信号的时间差，实现了光同步信号的时序闭环监控，达到的技术指标为同步时序闭环监控误差小于等于250 ps。采用本精密时序闭环监控同步技术一方面可以保证同步信号可靠的送达触发对象，另一方面根据测得的时间差值与设定的时序延时值进行比较，可以获得同步信号经过光传输的固有延时量，从而可以实现精密时序的精确配置要求。Abstract: In this paper, the precision delay generator with closed-loop monitoring of synchronous timing is developed. To enhance the anti-interference ability of signal transmission, the output of the delay generator is transmitted with optical signals. The optical synchronization signals is transmitted and fed back by using single-fiber feedback optical module. Based on the interpolation time interval measurement method, the time difference between the feedback optical synchronization signal and the reference signal can be measured with high precision. This system realizes the timing closed-loop monitoring of optical synchronization signals, and the error is less than or equal to 250 ps. On the one hand, the precision delay generator can ensure the reliable delivery of the synchronization signal to the trigger object. On the other hand, the inherent delay of the synchronization signal through the light transmission can be obtained according to the compared result between measured time difference and the set timing delay, so as to meet the precise configuration requirements of the precision timing.
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图 1 时序闭环监控同步机工作原理
Figure 1. Principle of the timing closed-loop monitoring synchronizer
图 2 多路电同步信号产生工作原理
Figure 2. Principle of multi-channel electrical synchronization signal generation
图 3 多路电同步信号产生原理图
Figure 3. Schematic diagram of multi-channel electrical synchronization signal generation
图 4 多路电同步信号产生PCB
Figure 4. PCB of multi-channel electrical synchronization signal generation
图 9 同步信号的单光纤反馈光传输
Figure 9. Single fiber feedback optical transmission of synchronous signal
图 10 单光纤反馈式光模块原理图
Figure 10. Schematic diagram of single-fiber feedback optical module
图 11 基于单光纤的光发模块、光收模块
Figure 11. Optical transmitter module and optical receiver module based on single fiber
图 12 光同步信号时序监控实验平台
Figure 12. Experiment platform for timing monitoring of the optical synchronization signal
图 13 示波器测试反馈脉冲1相对于RST的时间间隔误差测量
Figure 13. The oscilloscope measures the time-interval error of the feedback pulse1 relative to RST
图 14 时序监控单元测试反馈脉冲1相对于RST的时间间隔误差测量
Figure 14. The timing monitoring uint measures the time-interval error of the feedback pulse1 relative to RST
表 1 16路同步信号时序监控测试结果
Table 1. Results of delay resolution
delay between the feedback pulse and
RST in the oscilloscope/pspeak deviation/ps delay between the feedback pulse and
RST in the timing monitoring/pspeak deviation/ps 1029611～1029690 79 1029400～1029650 250 1029695～1029780 85 1029510～1029740 230 1029641～1029720 79 1029460～1029690 230 1029637～1029725 88 1029450～1029690 240 1029635～1029709 74 1029450～1029680 230 1029674～1029760 86 1029580～1029730 250 1029626～1029695 69 1029430～1029660 230 1029613～1029698 85 1029430～1029670 240 1029616～1029693 77 1029430～1029660 230 1029601～1029693 92 1029400～1029650 250 1029617～1029698 81 1029410～1029660 250 1029649～1029728 79 1029450～1029690 240 1029638～1029629 91 1029340～1029590 250 1029662～1029750 88 1029470～1029710 240 1029658～1029731 74 1029460～1029690 230 1029651～1029737 86 1029460～1029700 240 
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