一种人体阻抗测量模块的自校准方法

An auto calibration method of human body impedance measurement system

为了减小系统误差,提高系统的测量准确度,本文提出了一种人体阻抗测量模块自校准方法。该方法基于系统测量结果的线性度,在系统初始化后,通过对系统内部自带电阻网络的测量得到系统对被测电阻的测量值,再结合系统内部已存的被测电阻真实值,采用最小二乘法拟合出被测电阻测量值与真实值关系直线,获取系统误差的线性校正参数,并将参数用于后续阻抗的解调算法中,实现自校准。实际测试表明,该方法操作便捷,有效提高系统的测量准确度,具有较强的实用价值和借鉴意义。

In order to minimize the system error and improve the accuracy, an auto calibration method of the human body impedance measurement system based on bioelectrical impedance analysis is put forward in this paper. Considering the linearity of the measuring result, the system measures inner resistance networks after initialization and does linear regression between measured values and real values with least square method to get calibration coefficients. The system will then automatically take the calibration coefficients to calculate the measured resistances, which realizes the auto calibration of the whole system. And according to the experiment result, this method is easy to realize and effective, which has certain application and reference value.