CAJ | 학술논문

为适应资源有限系统对伪周期信号在线时域处理及数据压缩的要求,提出了一种模板参数估计简化方法.首先,将伪周期信号的每个一循环视为单周期信号,并以模板与单周期信号的均方误差作为目标函数,选择傅立叶级数作为模板.然后,根据两相邻周期信号的极大点或极小点位置差估计模板函数基频,利用三角函数正交性直接计算傅氏系数及误差指标,并通过预测与在线调整级数阶次,快速确定出给定精度下的最佳模板阶次.通过进一步在线微调信号周期,改善基频估计的准确性,得到符合精度要求的各伪周期信号模板参数.最后,基于超低功耗微控制器实现了对伪周期信号脉搏波的时域处理实验.实验结果表明,该方法简单有效,有利于减小计算功耗,适用于无线传感器节点等资源有限系统.
위괄응자원유한계통대위주기신호재선시역처리급수거압축적요구,제출료일충모판삼수고계간화방법.수선,장위주기신호적매개일순배시위단주기신호,병이모판여단주기신호적균방오차작위목표함수,선택부립협급수작위모판.연후,근거량상린주기신호적겁대점혹겁소점위치차고계모판함수기빈,이용삼각함수정교성직접계산부씨계수급오차지표,병통과예측여재선조정급수계차,쾌속학정출급정정도하적최가모판계차.통과진일보재선미조신호주기,개선기빈고계적준학성,득도부합정도요구적각위주기신호모판삼수.최후,기우초저공모미공제기실현료대위주기신호맥박파적시역처리실험.실험결과표명,해방법간단유효,유리우감소계산공모,괄용우무선전감기절점등자원유한계통.
In order to process pseudo-periodic signals on-line in time domain and data compression in hardware resource-constrained systems, a simplified method of template parameters estimation is presented. First, considering each cycle of pseudo-periodic signals as one single periodic and taking the mean square error between the template and measurements as a cost function, Fourier series is used as the template of the pseudo-periodic signal. Then, the fundamental frequency of the series is estimated by measuring the distance of the maximums or the minimums between each successive cyclic signal. With the orthogonality of trigonometric function, the Fourier coefficients and the error index are computed, and the best degree of series for a given tolerance can be quickly determined by predicting and on-line adjusting the degree of the series. Furthermore, through nicely adjusting the period of current cycle on-line, the matched errors are below the given tolerance, and therefore the coefficients corresponding to each pseudo-period can be refined. Finally, based on an ultra-low power microcontroller, the pseudo-periodic pulse wave on-line processing is implemented. The experimental results show that this method is simple and valid. It is helpful to reduce the power dissipation of computation and adaptive to resource-constrained system such as wireless sensors.