一种基于分数阶傅里叶变换的星载SAR速度快速估计方法、系统及产品
By combining fractional Fourier transform with a hyperbolic model, the problem of inaccurate velocity estimation in spaceborne SAR was solved, achieving fast and accurate velocity estimation for spaceborne SAR and improving imaging quality.
CN121325154BActive Publication Date: 2026-07-17CHANGGUANG SATELLITE TECH CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHANGGUANG SATELLITE TECH CO LTD
- Filing Date
- 2025-11-10
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
In existing technologies, inaccurate velocity estimation of spaceborne SAR leads to low SAR imaging quality, and amplitude- or phase-based methods are computationally complex, time-consuming, and have limited accuracy.
Method used
A method based on fractional Fourier transform is adopted, which combines coarse estimation and fractional Fourier transform with a hyperbolic model to quickly estimate the velocity of spaceborne SAR. Accurate estimation is achieved by using SAR echo data to perform coarse image focusing and calculate the residual azimuth frequency.
Benefits of technology
It significantly reduces computational complexity, improves the accuracy and speed of spaceborne SAR velocity estimation, and enables fast and accurate spaceborne SAR image focusing.
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Figure CN121325154B_ABST
Abstract
一种基于分数阶傅里叶变换的星载SAR速度快速估计方法、系统及产品，属于雷达遥感技术领域，解决了现有技术存在由于星载SAR速度估计不准确，导致SAR成像质量低，而使用基于幅度或基于相位的方法进行星载SAR速度估计，会导致计算复杂度高、耗时长和估计精度有限的技术问题。获取SAR回波数据，对SAR速度进行粗估计；基于SAR回波数据进行SAR成像，得到SAR图像，结合粗估计的SAR速度对SAR图像粗聚焦；采用分数阶傅里叶变换估计粗聚焦的SAR图像的残余方位向调频率；基于粗估计的SAR速度和残余方位向调频率，得到SAR速度的精确估计。本发明用于实现快速准确的星载SAR速度估计。
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