全息穿透雷达非平整表面杂波抑制算法研究

Uneven surface clutter mitigation for holographic subsurface radar

针对全息穿透雷达应用于无损探测时非平整表面杂波干扰难题,提出一种基于双频对消的非平整表面杂波抑制方法。该方法首先在设定条件下获取高低两种频率下的雷达回波数据,并建立相应回波信号模型。通过分析不同频率雷达回波中目标信号与非平整表面信号特点,结合理论推导估算模型中的各项参数,并拟合出表面回波的近似值,最后与原回波对消以抑制雷达图像中的非平整表面杂波。通过仿真与实测数据实验,验证了所提方法的有效性。

For the problem of uneven surface clutter when using holographic subsurface radar for non-destructive detection,a double-frequency cancellation based method is proposed to mitigate the uneven surface clutter.This method first obtains the low-frequency and high-frequency radar signals under setting conditions.Then,the corresponding signal model is constructed.By analysing the characteristics of target signals and non-flat surface signals in radar echoes of different frequencies,the parameters in the model are estimated by combining the theoretical derivation and fitting an approximation of the surface echoes.Finally,the estimated surface echo is cancelled with the original low-frequency echo to mitigate the uneven surface clutter.The effectiveness of the proposed method is verified by simulation and real experiments.