雷达高度计海况偏差估计不同纬度区间参数模型研究  

Study on Parametric Model of Estimating the Sea State Bias for Radar Altimeter in Different Latitudes

作　　者：张国首 苗洪利[1] 王桂忠[1] 郭迎婷 荆玉洁[1] 张杰[2] 

机构地区：[1]中国海洋大学信息科学与工程学院,山东青岛266100 [2]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《遥感技术与应用》2016年第6期1054-1058,1082,共6页Remote Sensing Technology and Application

基　　金：国家自然科学基金项目"雷达高度计海况偏差校正综合模型研究"(41176157);国家自然科学基金青年基金项目"降雨条件下HY-2高度计有效波高反演技术研究"(41406197)

摘　　要：针对用传统的参数模型进行海况偏差估计存在较大误差的问题,提出一种分段建模的方法来改进对海况偏差的估计。根据全球范围内有效波高和风速的纬度方向分布,确定以20°为分段间隔,将全球划分为6个纬度区间。基于Jason-2高度计数据,根据泰勒展开,以有效波高和风速为变量,在各纬度区间分别构建海况偏差估计参数模型。用解释方差、拟合度和残差评价检验模型,并与传统参数模型的估计结果以及Jason-2高度计GDR中非参数估计结果进行了比对,结果表明:纬度分段参数模型的估计结果较之传统方法在各纬度区间均有提升,在低纬度区域尤为明显。在保证参数模型优势的同时达到了与非参数方法相当的估计精度。说明本文所建纬度分段参数模型能够有效提高全球范围内海况偏差的估计精度以及海表面高度的校正水平。The traditional parametric models of estimating the sea state bias mayresult errors,so a segmented modeling method was presented to improve the estimations of the sea state bias.Based on the latitudinal distributions of the significant wave height and wind speed, the global area was divided into 6 different latitude ranges at the segmented interval of 20°.According to Taylor expansion,the parametric models as the function of significant wave height and wind speed were established in each lati- tude range based on the Jason-2 altimeter data The performances of this model were evaluated by the ex- plained variances and the residuals.Compared with the estimations of the traditional parametric model un- der the same dataset,the results showed that the segmented parametric model of latitude was superior to the latter,especially in low-latitude regions.And the precision of this model is near the nonparametric esti- mations in Jason-2 altimeter GDR.These suggested that the segmented parametric model of latitude can ef- fectively increase the precision of the sea state bias estimations,further improve the correction level of the sea surface height.

关 键 词：雷达高度计 海况偏差 有效波高(SWH) 风速 纬度分段 参数模型 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]