色散关系带通滤波器设计

为消除X波段雷达海杂波图像谱中非海浪能量,设计了色散关系带通滤波器（DRBF）.其带宽由测量海域主导波波数和估计的最大相对流速共同确定.根据主导波波数调节滤波器带宽,能使算法较好地适应海浪的特点;DRBF带宽由估计的最大流速调节,解决了传统上依赖实测流速构造DRBF不准确的问题.使用岸基实测雷达图像实验,将DRBF提取海浪谱反演得到的有效波高与现场传感器获得的有效波高进行比较,两者具有很高的相关性和很小的误差,可见设计的DRBF具有良好的性能和较高的可行性.

Research on dispersion relationship band filter

With the purpose of removing all energy not due to wave fields in X band radar sea clutter image spectrum,a dispersion relationship band filter was designed(DRBF).The bandwidth of the DRBF designed depended on main wave number and maximum relative current speed of measured sea area.By adjusting its bandwidth according to the main wave number,the DRBF could be better suitable for the measured sea area,hence it had higher precision.The DRBF′s bandwidth could also be revised by maximum relative current speed,which resolved the inaccuracy existing in classical DRBF base on real measured current speed.The DRBF designed was applied with real radar data.The significant wave height,compared with in-situ sensor′s significant wave height,was inverted,showing good capabilities of the DRBF.The results show that they have high correlation and low bias.It can be seen that the DRBF designed has good performance and feasibility.