基于时钟偏差补偿的高精度采样时刻标定

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中图分类号：N792；TP274 文献标识码：A 文章编号：2096-4706（2026）03-0014-04

Abstract：Traditional signal acquisition systems rely on high-precision crystal oscilltors to ensure the accuracy of sampling time.When thestabilityoftheclocksourceisinsuficient，thecumulativeerorissignificant.Thisstudyproposes a sub-secondtimecalibrationmethodbasedonFPGA.Specific informationisembedded inthedatablock encapsulation header， andthe parsing softwarecalculates thereference timeofeachdata blockand the precisesampling timeofanysampling point withinthedatablockaccordingtotheheaderinformation.Experimentalresultsshowthat thismethodeliminatesthecumulative error effectively. Under the condition of ±20×10-6 clock offset， the sampling time error is controlled within ±10 ns. Compared with traditional schemes，thetime precisionisimproved by nearly5 times.Thisstudy providesahigh-precisiontimecalibration scheme for signal acquisition systems using low-cost and medium-precision clock sources.

Keywords： sampling time calibration; sub-second counter; FPGA; signal acquisition system

0 引言

在某些系统应用中，用户需要获取采集数据中每一个采样点的精确采样时刻。（剩余5480字）