Abstract
Bioradar echoes are often very weak and submerged in noise. The SNR of radar signal is very low. Therefore, echo signal denoising is indispensable for extracting life information. In this paper, the method of weak signal denoising based on the combination of accumulation in frequency domain and wavelet transform is proposed. First, the effectiveness of frequency domain in accumulation and wavelet transform in denoising is presented respectively. Then, the combination of two methods was used to remove noise and extract useful information on the situation of Gaussian white noise. Simulation results show that the method can restrain the noise and extract useful signal effectively in low SNR.