测绘学报 ›› 2025, Vol. 54 ›› Issue (9): 1583-1595.doi: 10.11947/j.AGCS.2025.20240520

• 大地测量学与导航 • 上一篇    下一篇

基于科学阶段SWOT/KaRIn测高数据反演高精度的垂直重力异常梯度模型

押少帅1(), 刘新1(), 周瑞宸2,3, 李真1, 边少锋4, 郭金运1   

  1. 1.山东科技大学测绘与空间信息学院,山东 青岛 266590
    2.中国科学院精密测量科学与技术创新研究院精密大地测量与定位全国重点实验室,湖北 武汉 430077
    3.中国科学院大学,北京 100049
    4.中国地质大学(武汉)地质探测与评估教育部重点实验室,湖北 武汉 430074
  • 收稿日期:2025-01-06 修回日期:2025-08-15 出版日期:2025-10-10 发布日期:2025-10-10
  • 通讯作者: 刘新 E-mail:13526663057@163.com;xinliu1969@126.com
  • 作者简介:押少帅(1992—),男,博士,研究方向为卫星测高数据处理及海洋重力梯度反演。E-mail:13526663057@163.com
  • 基金资助:
    国家自然科学基金(42430101)

High accuracy vertical gradient of gravity anomaly model determined from SWOT/KaRIn altimetry data during scientific phase

Shaoshuai YA1(), Xin LIU1(), Ruichen ZHOU2,3, Zhen LI1, Shaofeng BIAN4, Jinyun GUO1   

  1. 1.College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
    2.State Key Lab of Precision Geodesy, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China
    3.University of Chinese Academy of Sciences, Beijing 100049, China
    4.Key Laboratory of Geological Survey and Evaluation of Ministry Education, China University of Geosciences, Wuhan 430074, China
  • Received:2025-01-06 Revised:2025-08-15 Online:2025-10-10 Published:2025-10-10
  • Contact: Xin LIU E-mail:13526663057@163.com;xinliu1969@126.com
  • About author:YA Shaoshuai (1992—), male, PhD, majors in altimeter data processing and marine gravity anomalies recovery. E-mail: 13526663057@163.com
  • Supported by:
    The National Natural Science Foundation of China(42430101)

摘要:

卫星测高技术是反演海洋垂直重力异常梯度的重要手段之一。针对常规的一维测高数据采样间隔大、跨轨数据稀疏、精度低的问题,SWOT(surface water and ocean topography)测高卫星可以提供二维宽刈幅海洋信息,获取更高空间分辨率和精度的海面高。本文基于1~20周期的SWOT海面高数据反演垂直重力异常梯度模型(SWOT_VGGA),首先,采用移去-恢复法的处理策略,将XGM2019e_2159作为参考场模型;然后,联合沿轨、跨轨和对角线3个方向的测高数据,并利用最小二乘配置法解算垂线偏差;最后,根据垂线偏差和参考场反演出SWOT_VGGA模型。本文选择菲律宾海为试验区域,将SIO V32.1版本的垂直重力异常梯度(SIO_curv_32.1)作为参考模型,结果表明SWOT_VGGA与SIO_curv_32.1模型的一致性为8.25 E,验证了一年SWOT测高数据反演垂直重力异常梯度的可靠性。此外,对SWOT_VGGA模型在不同水深、离岸距离和海底坡角的一致性进行了统计分析。结果表明,多周期SWOT_VGGA模型的一致性要优于单周期,而且1~10和11~20周期的SWOT_VGGA模型之间的一致性为1.81 E。因此,SWOT卫星在不同周期的数据质量比较稳定,可以用来反演高精度的海洋重力信息。

关键词: SWOT测高卫星, 海面高, 垂线偏差, 垂直重力异常梯度, 移去-恢复法

Abstract:

Satellite altimetry is a crucial technique for determining the marine vertical gradient of gravity anomaly. One-dimensional altimetry data suffer from large sampling intervals, sparse across-track data, and low precision. In comparison, the surface water and ocean topography (SWOT) altimetry satellite provides two-dimensional wide-range ocean information, achieving higher spatial resolution and accuracy in sea surface height measurements. Therefore, this paper presents a vertical gradient of gravity anomaly (SWOT_VGGA) model based on SWOT sea surface height data from cycles 1 to 20. The remove-restore technique was employed as the processing strategy, selecting XGM2019e_2159 as the reference gravity field model. The deflection of vertical was computed by combining along-track, cross-track, and diagonal-track altimetry data through least squares collocation. Based on the deflection of the vertical and the reference gravity field, the SWOT_VGGA model was obtained. This study focused on the Philippine Sea, with the vertical gravity gradient anomaly from SIO V32.1 employed as the reference. The results show an 8.25 E consistency between the SWOT_VGGA and SIO_curv_32.1 models, confirming the reliability of SWOT-derived vertical gradient of gravity anomaly from one year of SWOT altimetry data. Additionally, the model consistency was assessed across varying water depths, distances, and seafloor slope angles. Furthermore, the multi-cycle model exhibited better consistency than the single-cycle model. Specifically, the discrepancy between its 1~10 and 11~20 cycle subsets was only 1.81 E. This demonstrates that the data quality of the SWOT satellite exhibits stability across different cycles, making it suitable for inverting high-precision marine gravity information.

Key words: SWOT altimetry satellite, sea surface height, deflection of the vertical, vertical gradient of gravity anomaly, remove-restore method

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