Improved combined noise reduction method based on laser radar echo signal

The invention discloses an improved combined noise reduction method based on a laser radar echo signal. The method comprises the following steps of S1, obtaining an echo signal through a laser radar detector, and carrying out the noise reduction through a Gaussian filtering method; S2, performing time domain analysis on the filtered signal to further obtain a one-dimensional space matrix; S3, performing singular value decomposition on the one-dimensional space matrix by utilizing the one-dimensional space matrix; S4, selecting reconstruction subspaces of useful signals according to the acquired signal characteristics; and S5, performing singular value decomposition inverse transformation on the reconstructed subspace to obtain a noise reduction signal. According to the method, problems ofinaccurate signal distortion after filtering and the like caused by troubles of template selection and function width selection of Gaussian filtering in a traditional single noise reduction method aresolved, meanwhile, a prob