近海强干扰区域高频全聚焦SAR波形污染识别与海面高精确提取算法  

Waveform contamination identification and accurate sea surface height extraction algorithm for high-frequency fully-focused SAR in severely interfered coastal regions

作　　者：施宏凯 何秀凤[1] 吴怿昊 郑翔天 宋敏峰 SHI Hongkai;HE Xiufeng;WU Yihao;ZHENG Xiangtian;SONG Minfeng(School of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China;School of Computer Engineering,Nanjing Institute of Technology,Nanjing 211167,China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100 [2]南京工程学院计算机工程学院,江苏南京211167

出　　处：《测绘学报》2025年第2期272-285,共14页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(42374099;42304053);中央高校基本科研业务费专项(B240201097);江苏省卓越博士后计划(2024ZB632);江苏省高等学校基础科学(自然科学)研究(24KJB170010);江苏省基础研究专项资金(自然科学基金)(BK20241069)。

摘　　要：获取近海区域,特别是离岸3 km以内的海陆交界区的海面高度信息,一直是卫星测高技术面临的重大挑战。针对这一问题,本文深入研究了全聚焦SAR(fully-focused synthetic aperture radar,FFSAR)测高技术,提出了一种基于污染信号剔除和距离补偿的海面高提取算法,并引入验潮站数据作为独立验证数据,评估了不同沿轨向采样频率(20、80、200及600 Hz)下FFSAR在强干扰海域的测高精度。研究结果表明,在近海1~3 km的强干扰海域:①将FFSAR采样率由20 Hz提升至200 Hz,可以显著提升数据可用性及测高精度。②基于本文算法得到的200 Hz测高结果与验证数据差异的标准差分别由20 Hz结果的0.36(TGWD)、0.31(EEMSHAVEN)、0.68(DENHELDER)和0.17 m(IJMON)降至0.22、0.22、0.48和0.14 m,精度提升超过20%。③在200 Hz采样率下,相较MWaPP和PP-OCOG算法,本文算法得到的测高结果与验证数据的一致性更高。In coastal regions,particularly within 3 km from the coast,the accurate estimation of sea surface height(SSH)has remained a significant challenge for satellite altimetry techniques.This study investigates the fully-focused SAR(FFSAR)altimetry technique and proposes a SSH estimation algorithm based on contamination rejection and range compensation.Tide gauge data are introduced as independent observations to validate the altimetry performance of FFSAR in severe interfered coastal areas under different along-track sampling rates(20,80,200,and 600 Hz).The experiment results show that:①In the highly contaminated region within 3 km from the coast,increasing the FFSAR sampling rate from 20 Hz to 200 Hz significantly improves data availability and accuracy.②The standard deviations of the altimetry results obtained using the proposed algorithm against the validation data are reduced from 0.36(TGWD)、0.31(EEMSHAVEN)、0.68(DENHELDER)and 0.17 m(IJMON)to 0.22、0.22、0.48 and 0.14 m,respectively,corresponding to an improvement of over 20%.③At the 200 Hz sampling rate,the altimetry results from the proposed algorithm show better consistency with the validation data compared to the MWaPP and PP-OCOG algorithms.

关 键 词：SAR高度计 FFSAR 近海 信号干扰 海面高提取 

分 类 号：P229[天文地球—大地测量学与测量工程]