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直耦波和随机噪声是影响雷达信号的杂波,根据各种杂波在各频率段分布不同,在各道间相关性也不同的特性,采用时空域相结合的去噪方法,在时间域上采用小波变换将其分解到各频域上,在空间上采用KL变换提取出有效信号。去噪后的雷达图像更加清晰地反映地下介质情况,且在信噪比较低的情况下,仍能突出目标回波。该方法去除杂波速度快、效果好,特别适用于公路、铁路路基检测等海量数据处理领域。
The direct coupling and random noise are the clutters that affect the radar signal. According to the distribution of various clutter in different frequency bands and the different correlations among the channels, the de-noising method combined with space-time domain is adopted. In the time domain On the use of wavelet transform to decompose it into each frequency domain, using KL transform in space to extract the effective signal. The denoised radar image more clearly reflects the underground media situation, and in the case of low signal-noise ratio, the target echo can still be highlighted. The method has the advantages of fast removing clutter and good effect, and is particularly suitable for the field of mass data processing such as road and railway subgrade detection.