雷达高度计海况偏差估计不同纬度区间参数模型研究

发布时间：2017-12-30 19:48

本文关键词：雷达高度计海况偏差估计不同纬度区间参数模型研究　出处：《遥感技术与应用》2016年06期 　论文类型：期刊论文

【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。
[Abstract]:Aiming at the problem of large error in sea state deviation estimation using traditional parameter model. A piecewise modeling method is proposed to improve the estimation of sea condition deviation. According to the latitude distribution of effective wave height and wind speed in the global range, the segmented interval of 20 掳is determined. The global is divided into six latitudes. Based on the Jason-2 altimeter data and Taylor expansion, the effective wave height and wind speed are taken as variables. The estimation parameter model of sea condition deviation is constructed in each latitude region, and the evaluation model of interpretation variance, fitting degree and residual error is used to test the model. The results are compared with those of the traditional parameter model and the non-parametric estimation of the Jason-2 altimeter GDR. The results show that the estimation results of the model are better than that of the traditional method in all latitudes. It is especially obvious in the low latitude region. The estimation accuracy of the parametric model is equal to that of the non-parametric method while ensuring the superiority of the parametric model. It is shown that the proposed latitude piecewise parameter model can effectively improve the sea condition deviation in the global range. The accuracy of the estimation and the correction level of the sea surface height.
【作者单位】：中国海洋大学信息科学与工程学院;国家海洋局第一海洋研究所;
【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)
【分类号】：P715
【正文快照】： 1引言雷达高度计能够快速准确地获取全球的海表面高度(Sea Surface Height,SSH)、有效波高(Signifi-cant Wave Height,SWH)和风速(Wind Speed,U)等信息。海表面高度要经过诸多误差项校正,随着精密定轨技术的发展,海况偏差(Sea State Bias,SSB)已经取代轨道误差而成为第一误差

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