空间域相关法抗X波段航海雷达同频干扰

Research on correlation in spatial domain to eliminate the co-channel interference of the X-band marine radar

根据X波段航海雷达图像中海杂波的空间相关特性,提出了一种用于检测与抑制同频干扰噪声的方法。首先采用恒虚警率法确定合适阈值,利用相关法检测出干扰噪声线在雷达图像上的位置,然后利用一种改进型拉普拉斯线性增强模板实现干扰线上噪声点的定位,进而采用分段插值方法对检测出的噪声点进行修复以滤除噪声。利用实测雷达数据测试所提算法性能,结果证明:与均值、中值等传统滤波算法相比,所提方法在高海况条件下既能简单快速有效地检测到同频干扰噪声,又能更好地保留原海浪信号的回波信息,满足了海浪信息反演对信号回波质量的要求;在低海况条件下,也能有效去除同频干扰噪声。

According to the spatial correlation property of sea clutter in the X-band marine radar images, a method for detecting co-channel interference noise is presented. First, the appropriate threshold is determined by the constant false alarm rate method and the method of corrdation coefficient is used to detect the specific lo- cation of the interference noise line in the radar images, and then, the modified Laplace linear template is adopt- ed to locate the interference noise points only for these lines and interpolate these points linearly with the seg- ment part to filter out the noise. The algorithm is validated by using the real radar data and compared with the mean filtering and median filtering algorithms. The result shows that this method is simple and rapid since it can effectively filter the co-channel interference noise and retain the original wave echo information under high oce- anic conditions, and it meets the requirement of the waves information inversion to the quality of the received signal; under low sea state, the algorithm can effectively filter the co-channel interference noise too.