Polar Format Algorithm Wavefront Curvature Compensation Under Complicated Flight Path and Rugged Terrain

MAO Xin-hua; ZHU Dai-yin; ZHU Zhao-da

doi:10.3969/j.issn.0372-2112.2012.09.004

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Polar Format Algorithm Wavefront Curvature Compensation Under Complicated Flight Path and Rugged Terrain

更新时间：2025-07-16

- Polar Format Algorithm Wavefront Curvature Compensation Under Complicated Flight Path and Rugged Terrain
- Acta Electronica Sinica Vol. 40, Issue 9, Pages: 1723-1728(2012)
- 作者机构：
  
  南京航空航天大学电子信息工程学院,江苏,南京,210016
- 作者简介：
- 基金信息：
  
  National Defense Basic Scientific Research Program of China (No.B2520110008);National Natural Science Foundation of China (No.61071165);Aeronautical Science Foundation of China, ASFC (No.20102052024);The Third Batch of China Postdoctoral Science Foundation (No.201003586);Fundamental Research Funds for the Central Universities (No.NS2012097)
- DOI：10.3969/j.issn.0372-2112.2012.09.004
  CLC： TP958
- Published：2012
- 稿件说明：
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MAO Xin-hua, ZHU Dai-yin, ZHU Zhao-da. Polar Format Algorithm Wavefront Curvature Compensation Under Complicated Flight Path and Rugged Terrain[J]. Acta Electronica Sinica, 2012, 40(9): 1723-1728.
DOI：

MAO Xin-hua, ZHU Dai-yin, ZHU Zhao-da. Polar Format Algorithm Wavefront Curvature Compensation Under Complicated Flight Path and Rugged Terrain[J]. Acta Electronica Sinica, 2012, 40(9): 1723-1728. DOI： 10.3969/j.issn.0372-2112.2012.09.004.

摘要

极坐标格式算法(PFA)受波前弯曲误差影响

其有效成像场景范围受到一定限制.采用图像域的空变后滤波处理可以有效补偿波前弯曲误差

但该方法基于雷达平台线性运动假设

无法满足大机动条件下的波前弯曲误差补偿要求.本文提出了一种改进的空变后处理方法

该方法通过对相位历史域的波前弯曲误差函数做与PFA成像相同的极坐标格式转换处理

得到波前弯曲误差在两维空间频域的精确表示

因此再通过分块后滤波处理能够精确补偿雷达任意航迹和地形起伏条件下PFA波前弯曲误差

显著提高PFA有效成像场景范围.最后通过仿真数据处理验证了该算法的有效性.

Abstract

The space-variant defocus effect introduced by wavefront curvature in polar format algorithm (PFA) imagery limits its maximal focused scene size.Several compensation strategies have been developed in literature to solve this problem

e.g.

subaperture processing

space-variant post processing and widefield polar format algorithm.However

all these approaches are based on the assumption that radar platform is following an expected linear trajectory.They still can’t meet the required precision when imaging from arbitrary radar flight path.In this paper

an improved space-variant post processing method for wavefront curvature compensation is proposed.The method computes wavefront curvature error in original phase history domain

and then transforms it into spatial frequency domain by polar format transformation used in image formation.Using the transformed error

we can accurately compensate wavefront curvature effect by space-variant post filtering.Simulation experiments show that the new algorithm has improved focused scene size when applied to phase history generated by non-ideal radar flight path.

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Related Institution

National Key Laboratory of Radar Signal Processing, Xidian University

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