The Error Analysis of the Algorithm Based on Spectrum Shift Estimation for Improving Range Resolution

XU Hua-ping; ZHOU Yin-qing; LI Chun-sheng

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The Error Analysis of the Algorithm Based on Spectrum Shift Estimation for Improving Range Resolution

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- The Error Analysis of the Algorithm Based on Spectrum Shift Estimation for Improving Range Resolution
- Acta Electronica Sinica Vol. 34, Issue 9, Pages: 1562-1565(2006)
- 作者机构：
  
  北京航空航天大学电子信息工程学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN959
- Published Online：25 September 2006，
  
  Published：2006
- 稿件说明：
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XU Hua-ping, ZHOU Yin-qing, LI Chun-sheng. The Error Analysis of the Algorithm Based on Spectrum Shift Estimation for Improving Range Resolution[J]. Acta Electronica Sinica, 2006, 34(9): 1562-1565.
DOI：

XU Hua-ping, ZHOU Yin-qing, LI Chun-sheng. The Error Analysis of the Algorithm Based on Spectrum Shift Estimation for Improving Range Resolution[J]. Acta Electronica Sinica, 2006, 34(9): 1562-1565. DOI：

摘要

基于频谱偏移估计算法是一种分布式小卫星合成孔径雷达(Distributed Small Satellite Synthetic Aperture Radar

简写为DSS-SAR)提高距离向分辨率的数据处理方法

它实现过程简洁、数据量小.从基于频谱偏移估计算法的实现过程知道

其性能主要受到频谱重叠和频谱偏移估计误差的影响

本文着重研究这两种误差因素对由该算法处理得到的合成图像质量的影响.分别推导了存在频谱重叠和频谱偏移估计误差时合成图像的数学表达式

分析了它们对合成图像质量的影响

提出了:1.频谱重叠主要引起合成图像中点目标旁瓣抬高;2.频谱偏移估计误差主要引起合成图像中点目标主瓣衰减和旁瓣抬高.利用点目标仿真验证了理论分析的正确性.最后根据误差分析结果

对基于频谱偏移估计算法的实现提出了改进的建议.

Abstract

The algorithm based on spectrum shift estimation is a processing method with brief flowchart and less processing time for improving range resolution in distributed small satellite synthetic aperture radar(DSS-SAR).But its performance is decreased by spectrum overlap and estimation error of spectrum shift.The influence of these two factors on the algorithm is analyzed in this paper.The mathematic expressions of the combination image

including the effect of the two kinds of errors

are deduced respectively

and the image quality worsening caused by the errors is discussed.The expressions and the discussion show that spectrum overlap decreases the peak side lobe ratio and the integral side lobe ratio of point targets

and the error of spectrum shift attenuates main lobe and increases the side lobe of point targets in the combination image.The point target simulation is employed to validate the analysis.Some suggestions are presented to improve the implementation of the algorithm based on spectrum shift

and a new concept of processing depth is proposed to enhance the practicality of the algorithm.

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