星载ATI-SAR系统洋流测速要点分析与仿真

doi:10.16182/j.issn1004731x.joss.201810032

系统仿真学报 ›› 2018, Vol. 30 ›› Issue (10): 3861-3869.doi: 10.16182/j.issn1004731x.joss.201810032

星载ATI-SAR系统洋流测速要点分析与仿真

闫贺, 朱岱寅

南京航空航天大学电子信息工程学院,南京 210016

收稿日期:2016-08-26 修回日期:2017-01-05 出版日期:2018-10-10 发布日期:2019-01-04
作者简介:闫贺(1985-), 男, 江苏徐州, 博士生, 讲师, 研究方向为合成孔径雷达系统设计及信号处理。
基金资助:
国家自然科学基金(61501231),江苏省自然科学基金(BK20150759),航空科学基金(20152052027),中央高校基本科研业务费专项资金(NZ2016105)

Key Points Analysis and Simulation for Sea Surface Velocity Estimation Based on Spaceborne ATI-SAR System

Yan He, Zhu Daiyin

College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2016-08-26 Revised:2017-01-05 Online:2018-10-10 Published:2019-01-04

摘要/Abstract

摘要： 沿航迹干涉(ATI)技术是星载SAR系统的重要应用之一。通过对同一区域获取的复数SAR图像进行干涉处理,ATI-SAR系统可以直接检测到SAR图像每个像素点的多普勒偏移。对于进行洋流测速的星载ATI-SAR系统而言,基线长度、速度分辨率及速度测量误差是系统设计的三大要素,因此这里针对此三大要素进行了详细分析。给出了星载ATI-SAR的基本原理并推导了相应的公式。总结了基线选择的基本方法。分析和推导了速度分辨率和洋流测速误差。得出了相关结论,这些结论对未来的洋流测速ATI-SAR系统的设计具有重要的指导作用。

关键词: 星载SAR, ATI, 洋流测速, 误差分析

Abstract: ATI (Along Track Interferometric) technique is one of the most important applications for spaceborne SAR (Synthetic Aperture Radar) systems. ATI-SAR systems can directly detect the Doppler offset associated with each pixel of a SAR image. This is achieved by interferometric combination of two complex SAR images of the same scene. The sea surface velocity can be estimated via the calculated interferometric phase. The baseline length, velocity resolution and velocity estimation error are three important factors in the process of spaceborne ATI-SAR system design, and these three points are carefully investigated here. The basic principle and expression of spaceborne ATI-SAR system are presented. The selection method of baseline length is discussed. The velocity resolution is studied, as well as the velocity estimation error. Some conclusions are drawn to play an important role in future spaceborne ATI-SAR system design.

Key words: spaceborne synthetic aperture radar, along track interferometric, sea surface velocity estimation, error analysis

中图分类号:

TP391.9

闫贺, 朱岱寅. 星载ATI-SAR系统洋流测速要点分析与仿真[J]. 系统仿真学报, 2018, 30(10): 3861-3869.

Yan He, Zhu Daiyin. Key Points Analysis and Simulation for Sea Surface Velocity Estimation Based on Spaceborne ATI-SAR System[J]. Journal of System Simulation, 2018, 30(10): 3861-3869.

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星载ATI-SAR系统洋流测速要点分析与仿真

Key Points Analysis and Simulation for Sea Surface Velocity Estimation Based on Spaceborne ATI-SAR System

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