The SNR of silicon resonance microsensor output signal is low. The frequency of signal is always submerged in noise. The SPA and SNR of stochastic resonators system are analyzed. A signal frequency measurement method based on heterodyne stochastic resonance is proposed to detect silicon resonance microsensor output signal frequency. The results of theoretical analysis and numerical simulation manifest that the energy of noise can be transferred to signal frequency through the heterodyne stochastic resonance...