高频地波雷达海洋表面流方位的超分辨估计

Super-resolution estimation of the ocean surface current for the HF ground wave radar

在对洋流相关性分析的基础上,提出了一种适用于高频地波雷达海洋表面流方位的超分辨估计方法.首先对阵列输出做预处理,在频域中对海洋表面流信号进行分离,提取可能存在海浪信号的谱点,然后采用前后向空间平滑技术,去掉海洋信号间的相关性,最后用MUSIC方法在频域上进行DOA估计.实测数据处理结果证明了文中所提出的超分辨方法的有效性和实用性.

A method for super-resolution estimation of the ocean surface current for the HF ground wave radar is presented based on spatial correlation of the ocean surface current being analyzed. First, the sequences of sea echoes of each range call are separated in the frequency domain, signal sources are separated near the Bragg peak in the frequency domain and then special relativity between ocean surface currents is removed by the technique of special smoothing. Finally, the method of MUSIC is used to estimate the DOA of the ocean surface currents in the frequency domain. Simulation results in real data show that the algorithm for super-resolution estimation of sea echoes in effective and practical.