面向海流反演的多普勒散射计天线转速优化方法  

An Antenna Rotation Speed Optimization Method of Doppler Scatterometer for Ocean Surface Current Inversion

作　　者：孙伟峰[1] 李雯[1] 范陈清 贾晨 戴永寿[1] Sun Weifeng;Li Wen;Fan Chenqing;Jia Chen;Dai Yongshou(College of Oceanography and Space Informatics,China University of Petroleum(East China),Qingdao 266580,China;Remote Sensing Office of the First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China)

机构地区：[1]中国石油大学(华东)海洋与空间信息学院,山东青岛266580 [2]自然资源部第一海洋研究所遥感室,山东青岛266061

出　　处：《中国海洋大学学报（自然科学版）》2024年第3期116-125,共10页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(62071493,61831010)资助。

摘　　要：本文针对多普勒散射计天线转速过快或者过慢导致海流反演精度较低甚至无法进行海流反演的问题,提出了一种面向海流反演的天线转速优化方法。该方法以研究区域内被天线波束覆盖3次或者4次的目标海面数量为目标函数,以顺轨与交轨方向的波束足印连续性、空间分辨率要求作为约束条件,结合天线转速与天线扫描损耗的关系,建立了非线性约束下的多普勒散射计天线转速优化模型,利用优化得到的天线转速计算得到每个目标海面的观测方位向组合。利用海洋表面流实时分析数据,采用基于观测方位向优选的矢量流合成方法进行了海流反演实验。结果表明,在天线转速为20 r·min^(-1)时,不同研究区域内被雷达内、外波束足印覆盖到3次或者4次的目标海面数量占总目标海面数量的80%以上,反演得到的流速、流向标准差小于0.1 m·s^(-1)、20°,满足海洋工程应用对海流观测的精度需求。In view of the problem that the Doppler Scatterometer antenna rotation speed is too fast or too slow,the ocean surface current inversion accuracy will be low and even the ocean current inversion cannot be carried out,an antenna rotation speed optimization method with three constraints is proposed.In this method,the number of target sea surface covered by antenna beams for 3 or 4 times in the research area is taken as the objective function,the continuous coverage requirement of antenna beam footprints in the direction of along-track and cross-trackand the spatial resolution requirement are taken as the constraint conditions,according to the relationship between antenna rotation speed and antenna scanning loss,the antenna rotation speed optimization model of Doppler Scatterometer under nonlinear constraints is established,and the observation azimuths of each target sea surface are calculated using the determined optimal antenna rotation speed.With the Ocean Surface Current Analyses Real-time data as input,vector current estimation experiments were conducted by the current inversion method based on observation azimuth optimization.The results show that when the optimal antenna rotation speed is 20 r·min^(-1),the number of sea surfaces that are covered three or four times by the radar inner and outer beam footprints accounts for more than 80%of the total target sea surface in different study areas,the standard deviation of the obtained current velocity and direction are less than 0.1 m·s^(-1) and 20°,which meets the demand in precision of ocean surface current observation for global climate variability research.

关 键 词：多普勒散射计 天线转速 海流反演 观测方位向 OSCAR数据 

分 类 号：TP732.1[自动化与计算机技术—检测技术与自动化装置]