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

doi:10.11947/j.AGCS.2025.20240103

测绘学报 ›› 2025, Vol. 54 ›› Issue (2): 272-285.doi: 10.11947/j.AGCS.2025.20240103

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

施宏凯¹(), 何秀凤¹(), 吴怿昊¹, 郑翔天², 宋敏峰¹

^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

收稿日期:2024-03-15 出版日期:2025-03-11 发布日期:2025-03-11
通讯作者: 何秀凤 E-mail:shk@hhu.edu.cn;xfhe@hhu.edu.cn
作者简介:施宏凯（1993—），男，博士，研究方向为卫星测高及海洋动力学建模。　E-mail：shk@hhu.edu.cn
基金资助:
国家自然科学基金(42374099);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)

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

Hongkai SHI¹(), Xiufeng HE¹(), Yihao WU¹, Xiangtian ZHENG², Minfeng SONG¹

^1.School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
^2.School of Computer Engineering, Nanjing Institute of Technology, Nanjing 211167, China

Received:2024-03-15 Online:2025-03-11 Published:2025-03-11
Contact: Xiufeng HE E-mail:shk@hhu.edu.cn;xfhe@hhu.edu.cn
About author:SHI Hongkai (1993—), male, PhD, majors in satellite altimetry and ocean dynamic modeling.　E-mail: shk@hhu.edu.cn
Supported by:
The National Natural Science Foundation of China(42374099);The Fundamental Research Funds for the Central Universities(B240201097);Jiangsu Funding Program for Excellent Postdoctoral Talent(2024ZB632);The Natural Science Foundation of Jiangsu Province Higher Education Basic Science(24KJB170010);Natural Science Foundation of Jiangsu Province(BK20241069)

摘要/Abstract

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。

关键词: SAR高度计, FFSAR, 近海, 信号干扰, 海面高提取

Abstract:

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: ① In 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. ② The 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%. ③ At 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.

Key words: SAR altimetry, FFSAR, coastal area, signal contamination, SSH extraction

中图分类号:

P229

施宏凯, 何秀凤, 吴怿昊, 郑翔天, 宋敏峰. 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[J]. 测绘学报, 2025, 54(2): 272-285.

Hongkai SHI, Xiufeng HE, Yihao WU, Xiangtian ZHENG, Minfeng SONG. Waveform contamination identification and accurate sea surface height extraction algorithm for high-frequency fully-focused SAR in severely interfered coastal regions[J]. Acta Geodaetica et Cartographica Sinica, 2025, 54(2): 272-285.

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参考文献 36

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采样率/Hz	TGW2/m	AWG/m
20	0.136	0.115
80	0.141	0.117
200	0.139	0.118
600	0.160	0.145

采样率/Hz	TGWD/m	EEMSHAEN/m	DENHELDER/m	IJMON/m
20	0.36	0.31	0.68	0.17
80	0.35	0.27	0.56	0.18
200	0.22	0.22	0.48	0.14
600	0.27	0.26	0.51	0.15

测高结果/Hz	Max/m	Min/m	Mean/m	SD/m
20	0.74	-0.82	0.05	0.36
80	0.85	-0.70	0.10	0.35
200	0.43	-0.36	0.04	0.22
600	0.51	-0.41	0.05	0.27

测高结果	TGWD	EEMSHAVEN	DENHELDER	IJMON
200 Hz PP-OCOG	0.57	0.76	1.33	0.20
200 Hz MWaPP	0.56	0.73	1.28	0.13
200 Hz FFSAR_RNG	0.22	0.22	0.48	0.14

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

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