an example, this paper analyzes some of the basic input-output relations, derives the basic formulas of function of conditions in the power spectral density and partial coherence function, gives the combing method of conditions of the power spectral function and the partial coherence function, and makes the relevant simulations.

Now research of speckle denoising algorithm in SAR image gradually becomes the hot topic of study.

The τ-p transform is one of the important techniques to eliminate coherent noises and separate wave fields,but the operator aliasing artifacts and edge effect artifacts affect its resolution,therefore the conventional τ-p transform can t be used simply.

It is necessary to remove coherent noises and random noises in seismic data processing in order to improve the signal-to-noise ratio.

Study on coherent noise attenuation using radial trace transform filtering;

Study on using radial trace transform to depress coherent noise in high-density acquired data;

Self-adaptive coherent noise attenuation technique;

Application of noise functions to the wood texture;

Using the noise function of the software package and combining with the AD/DA technology,the signal is added a noise in.