基于GPS的破片测速多设备同步触发方法
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摘要
针对破片测速多设备同步触发时易误触发,布线困难等问题,提出了一种基于GPS的破片测速多设备同步触发方法。利用GPS高精度的秒脉冲和通用异步收发传输器(UART)时间信息周期性的同步设备系统时间;使用现场可编程门阵列(FPGA)作为控制芯片,使用高精度晶振作为基准时钟,进一步降低误差。理论分析了在30 s同步一次情况下,双设备时间误差最大为8. 4μs,长时间GPS不同步时多台设备累积误差到达1 ms时间为59 min。利用示波器对GPS模块的秒脉冲信号精度做了验证,证明两个GPS模块秒脉冲之间误差在50μs以内。最后使用数据采集仪采集同一周期性三角波,设置为GPS触发方式。两台设备在同一时间触发,观察采集到的波形,两台设备的时钟误差在20μs以内,验证了方案的可行性。
Aiming at the problem that the fragmentation speed multi-device synchronous triggering is easy to trigger,and the wiring is difficult,a GPS-based fragment triggering multi-device synchronous triggering method is proposed. Periodically synchronize device system time with GPS high-precision time pulse and universal asynchronous receiver/transmitter( UART) time information. Using the field-programmable gate array( FPGA) as the control chip and using the high-precision crystal as the reference clock further reduces the error. Theoretical analysis shows that the maximum time error of the dual device is 8. 4 μs in the case of 30 s synchronization. When the GPS is not synchronized for a long time,the cumulative error of multiple devices reaches 1 ms in 59 min. Using the oscilloscope to verify the accuracy of the GPS module's time pulse signal,it is proved that the error between the two GPS module time pulse is within 50 ns. Finally,the same periodic triangular wave is collected by using the data acquisition instrument,and the GPS trigger mode is set. The two devices are triggered at the same time to observe the acquired waveform. The clock error of the two devices is less than 20 μs,which verifies the feasibility of the solution.
Aiming at the problem that the fragmentation speed multi-device synchronous triggering is easy to trigger,and the wiring is difficult,a GPS-based fragment triggering multi-device synchronous triggering method is proposed. Periodically synchronize device system time with GPS high-precision time pulse and universal asynchronous receiver/transmitter( UART) time information. Using the field-programmable gate array( FPGA) as the control chip and using the high-precision crystal as the reference clock further reduces the error. Theoretical analysis shows that the maximum time error of the dual device is 8. 4 μs in the case of 30 s synchronization. When the GPS is not synchronized for a long time,the cumulative error of multiple devices reaches 1 ms in 59 min. Using the oscilloscope to verify the accuracy of the GPS module's time pulse signal,it is proved that the error between the two GPS module time pulse is within 50 ns. Finally,the same periodic triangular wave is collected by using the data acquisition instrument,and the GPS trigger mode is set. The two devices are triggered at the same time to observe the acquired waveform. The clock error of the two devices is less than 20 μs,which verifies the feasibility of the solution.
引文
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2杨业敏,张旭东.一种野外测试用高性能触发线路[J].爆炸与冲击,1981,1(1):97-98Yang Yemin。Zhang Xudong.A kind of high quality trigger circuit used in field measurement[J].Explosion and Shock Waves,1981,1(1):97-98
3徐景茂,李永池,陈安敏,等.化爆试验中测试系统触发同步的新方法[J].计量与测试技术,2011,38(10):58-61Xu Jingmao,Li Yongchi,Chen Anmin,et al.New method of synchronous trigger action of measurement system in explosion test[J].Metrology&Measurement Technique,2011,38(10):58-61
4刘小彦,刘吉,张斌,等.大当量爆炸场破片速度测试系统中声光触发设计[J].火炮发射与控制学报,2015,36(2):73-76,92Liu Xiaoyan,Liu Ji,Zhang Bin,et al.Acoustooptic triggering design in the test system of large equivalent explosive field fragmentation speed[J].Journal of Gun Launch and Control,2015,36(2):73-76,92
5张斌,李佳潞,赵冬娥,等.基于小波滤波及相关分析的激光光幕破片测速信号数据处理[J].兵工学报,2016,37(3):489-495Zhang Bin,Li Jialu,Zhao Donge,et al.Data processing of laser light curtain fragment velocity signal based on wavelet filter and correlation analysis[J].Acta Armamentari Sinica,2016,37(3):489-495
6 Zhao DE,Zhou HC,Liu J,et al.High-precision velocity measuring system for projectiles based on retroreflective laser screen[J].OptikInternational Journal for Light and Electron Optics,2013,124(6):544-548
7刘吉,于丽霞,张斌,等.基于爆炸火光光谱分析的大当量爆炸场破片速度测试方法研究[J].光谱学与光谱分析,2016,36(3):631-634Liu Ji,Yu Lixia,Zhang Bin,et al.A method to measure the velocity of fragments of large equivalence explosion field based on explosion flame spectral analysis[J].Spectroscopy and Spectral Analysis,2016,36(3):631-634
8蒋陆萍,曾祥君,李泽文,等.基于GPS实现电力系统高精度同步时钟[J].电网技术,2011,35(2):201-206Jiang Luping,Zeng Xiangjun,Li Zewen,et al.High-precision synchronous clock of power system based on GPS[J].Power System Technology,2011,35(2):201-206
9陈威,张丕状.分布式测试系统同步时钟校准的频率测量方法[J].探测与控制学报,2009,31(5):69-72,76Chen Wei,Zhang Pizhuang.Frequency measurement method of synchronization clock calibration in distributed testing system[J].Journal of Detection&Control,2009,31(5):69-72,76
10王华龙,于生宝.海洋可控源甲板监控系统GPS对钟的设计与实现[J].科学技术与工程,2014,14(2):176-178Wang Hualong,Yu Shengbao.Design and implementation of GPSsynchronization technology on the deck monitored control system for marine controlled source[J].Science Technology and Engineering,2014,14(2):176-178
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