针对现有的常规的等效时间采样方法必须具备准确的模拟触发电路,必须具备精确的定时电路或时长检测电路,并且波形重建时间长甚至不能完全重建的问题,提出一种基于参量模型估计的周期信号等效时间采样方法.该方法采用三个两两互质频率进行三轮采样,从三轮采样数据估计出被测周期信号的基频和其它参数,从而重构出被测周期信号波形.实验证明,该方法在信噪比较高时重构出被测周期信号波形的正确概率很高,重构误差很小.该方法已被成功运用到数字存储示波器的高速数据采集系统中. In view of the existing conventional equivalent time sampling method, it is necessary to have an accurate analog triggering circuit, an accurate timing circuit or a long-time detection circuit, and a long reconstruction time or even a complete reconstruction of the waveform. A parameter estimation model Periodic signal equivalent time sampling method.This method uses three two-two-two-interi-frequency sampling for three rounds, estimates the fundamental frequency and other parameters of the measured periodic signal from three rounds of sampled data to reconstruct the waveform of the measured periodic signal The experiment proves that this method can reconstruct the correct probability of signal waveform under test when the signal to noise ratio is high and the reconstruction error is very small.This method has been successfully applied to the high speed data acquisition system of digital storage oscilloscope.