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基于FPGA的多通道自适应频率测量方法

Measurement Method of Multi-channel Self-adapting Frequency Based on FPGA
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摘要 在大型试验系统中,为满足实时控制的要求,需快速、精确地测量出多个通道信号的频率值。对多周期同步测频法进行改进,提出一种自适应测频法:对于被测信号,采用上升沿和下降沿一起计数;对于标准频率信号,通过判断计数时间是否超过门限时间且包含被测信号至少1个周期来停止计数。新方法包含更多的测量样本,能避免产生无效的测量时间,使测量更加高效,并能在很宽的频率范围内保证测量精度,同时可通过现场可编程门阵列(FPGA)芯片物理多线程并行工作模式来保证多通道同步采集。理论分析和试验结果表明,该改进的自适应测频法优于传统的多周期同步测频法。 In a large mechanical test system,it is necessary to measure the frequency values of multi-channel’s signals quickly and accurately to meet the requirement of real-time control.The self-adapting frequency measurement method is improved,and an adaptive frequency measurement method is proposed.The measured signal is counted with rising and falling,and counting of standard frequency signal is stopped by judging whether the counting time surpasses the threshold time and includes at least one cycle of the measured signal.The new method contains more measurement samples,avoiding invalid measurement time,making measurement more efficient,and ensuring measurement accuracy in a wide frequency range.At the same time,it can ensure multi-channel synchronous acquisition through physical multi-threading parallel mode of field programmable gate array FPGA chip.Theoretical analysis and experimental results show that the improved self-adapting frequency measurement method is superior to the traditional multi-cycle synchronous frequency measurement method.
作者 缪凯祥 石磊 王刚毅 刘彬 MIAO Kaixiang;SHI Lei;WANG Gangyi;LIU Bin(Shanghai Marine Equipment Research Institute,Shanghai 200031,China)
出处 《船舶工程》 CSCD 北大核心 2019年第6期86-90,134共6页 Ship Engineering
关键词 频率测量 测量时间 多通道 现场可编程门阵列(FPGA) frequency measurement measurement time multi-channel field programmable gate array(FPGA)
作者简介 缪凯祥(1991—),男,助理工程师,研究方向:船舶设备自动化及控制技术。
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