High Resolution Imaging Algorithm for Helicopter-Borne Rotating Synthetic Aperture Radar Using Frequency Modulated Continue Waveform

LI Dong; LIAO Gui-sheng; XU Qing; GUO Xiao-lu; ZHANG Xue-pan

doi:10.3969/j.issn.0372-2112.2014.01.001

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High Resolution Imaging Algorithm for Helicopter-Borne Rotating Synthetic Aperture Radar Using Frequency Modulated Continue Waveform

更新时间：2025-07-16

- High Resolution Imaging Algorithm for Helicopter-Borne Rotating Synthetic Aperture Radar Using Frequency Modulated Continue Waveform
- Acta Electronica Sinica Vol. 42, Issue 1, Pages: 1-8(2014)
- 作者机构：
  
  西安电子科技大学雷达信号处理重点实验室,陕西,西安,710071
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0372-2112.2014.01.001
  CLC： TN957
- Published：2014
- 稿件说明：
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LI Dong, LIAO Gui-sheng, XU Qing, et al. High Resolution Imaging Algorithm for Helicopter-Borne Rotating Synthetic Aperture Radar Using Frequency Modulated Continue Waveform[J]. Acta Electronica Sinica, 2014, 42(1): 1-8.
DOI：

LI Dong, LIAO Gui-sheng, XU Qing, et al. High Resolution Imaging Algorithm for Helicopter-Borne Rotating Synthetic Aperture Radar Using Frequency Modulated Continue Waveform[J]. Acta Electronica Sinica, 2014, 42(1): 1-8. DOI： 10.3969/j.issn.0372-2112.2014.01.001.

摘要

本文提出一种新的基于调频连续波（Frequency Modulated Continuous Wave，FMCW）的直升机载旋转式合成孔径雷达（Rotating Synthetic Aperture Radar，ROSAR）成像模型，并给出了相应的成像算法.该方法首先利用等效相位中心原理，将收发分置天线系统的回波信号等效为自发自收单基系统.在此基础上，使用高阶逼近原理建立了ROSAR的回波信号模型，结合级数反演的思想推导出其精确的二维频谱表达式，分析了雷达天线连续运动的影响产生多普勒频移，并给出其补偿方法.最后运用高效的Chirp-Z变换校正了距离单元徙动空变性，得到了聚焦良好的SAR图像.仿真结果验证了分析结论的正确性和算法的有效性.

Abstract

A frequency modulated continue wave (FMCW) rotating synthetic aperture radar (ROSAR) imaging mode and corresponding imaging algorithm are presented.Firstly

the separated transmit antenna and receive antenna system are equalized to the case of system configuration with antenna both for transmitting and receiving signals according to the equivalent phase center principle.Based on this

by approximating the slant equation with the higher order model

one can obtain accurate two-dimensional frequency spectrum via the series reversion method.The Doppler frequency shift effect

induced by the platform's continuous motion while radar tr

ansmits and receives signals

is analyzed and the approximate compensation method is shown.Finally

efficient Chirp-

transform (CZT) is applied to correct the range-variant range cell migration (RCM) and well-focused SAR image is obtained.Simulation results verify the correctness of the analysis and the validity of the proposed algorithm.

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Radar Specific Emitter Identification Method Under Multipath Conditions

An Improved Fast 2D Discrete Polar Fourier Transform Algorithm

Analysis of Motion Compensation for FMCW Synthetic Aperture Radar

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