Sea clutter is consist of a speckle component modulated by texture.The stationary properties of speckle and texture will be researched in the paper.By using the discrete Fourier transform(DFT)modulated filter bank to decompose sea clutter into low-rate subband signals

two consistency factors are proposed to analyze the stationary properties of speckle and texture of different subband signals

respectively.The results show that the non-stationary characteristics of sea clutter is mainly reflected in texture.Texture is significantly non-stationary in the strong clutter region

and vice versa.Considered that sea clutter in different Doppler frequency has different stationary property

by using the consistency factor of texture as a judge function

a subband switching adaptive normalized matched filter(ANMF)detector is proposed in the paper

where the covariance matrix estimator is sample covariance matrix(SCM)or normalized sample covariance matrix(NSCM)

respectively.The experimental results show that

to detect targets in real sea clutter

the subband switching ANMF detector outperforms competitors.