本文提出一种基于相关运算的新方法,把经过隔离,滤波等处理后的信号送入芯片的模数转换器进行抽样,并按照相关运算公式的离散时间表达式进行计算。通过测试,此算法不但能够达到很高的准确度,而且能够有效地抑制各种干扰。 In this paper, a new method based on the correlation operation is proposed. The signal after the isolation, filtering and so on is sent to the analog-digital converter of the chip for sampling, and is calculated according to the discrete time expression of the relevant operation formula. Pass the test, this algorithm can not only achieve high accuracy, but also can effectively suppress various interferences.