采用便携式天线的近海海洋表面流探测

Ocean Surface Current Detection by HF Ground Wave Radar with Portable Antenna System

针对高频地波雷达天线阵通常十分庞大的问题,根据海洋回波理论,利用单个到达角海洋回波进行雷达通道幅度相位的自校准,应用适合便携式天线系统的信源估计方法,采用 MUSIC(MUltiple SIgnal Classifica tion)算法反演海流信息,研究了交叉环/单极子天线在高频地波雷达近海海洋表面流探测中的应用.将探测结果与采用相控阵接收的高频地波雷达OSMAR2000的探测结果进行对比,径向流速平均偏差为 1.3 cm/s,说明近海海洋表面流探测采用便携式的小天线可取得与传统相控阵相同的效果.

HF ground radar is characterized by its large antenna system.According to the theory of sea echoes,this paper studies the application of crossed-loop/monopole antenna in ocean surface current detection by HF ground wave redar.Amplitude and phase calibration of receiving channels by single arriving sea echoes is applied first,then unique sourec number estimation suitable for the compact antenna system is discussed,and MUSIC (MUltiple SIgnal Classification) algorithm is proposed to apply in surface current mapping.Verification tests are carried out by comparing the radial current results with that detected by OSMAR2000,a HF ground wave radar system adopts phased array.The bias of radial current velocity is (1.3) cm/s.The results show that the compact crossed-loop/monopole antenna is equivalent with the traditional phased array in ocean surface currents detection.