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According to the result of signal demand analysis, the standard index signal to be processed is selected, and the calculation of evaluation operator is made to evaluate the signal quality. On this basis, the frequency interval of the wearable equipment signal is adjusted and analyzed by adjusting the polarization signal of the sensor and calculating the measuring standard device, and the frequency measurement scheme of the wearable device signal is constructed. Compared with QT method, the new signal frequency is applied. After the rate measurement, the immunity level of EMI is improved effectively, and the maximum ratio of detection bandwidth is not more than 55%.