Centroid location for space targets based on energy accumulation

SUN Jin-qiu; ZHOU Jun; ZHANG Zhen; ZHANG Yong-peng

doi:10.3788/OPE.20111912.3043

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Centroid location for space targets based on energy accumulation

Article | 更新时间：2020-08-12

- Centroid location for space targets based on energy accumulation
- Optics and Precision Engineering Vol. 19, Issue 12, Pages: 3043-3048(2011)
- 作者机构：
  
  1. 西北工业大学精确制导与控制研究所,陕西西安,710072
  2. 西北工业大学计算机学院,陕西西安,710129
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20111912.3043
  CLC： TN386.5;TP391.4
- Received：31 March 2011，
  
  Revised：05 May 2011，
  
  Published Online：25 December 2011，
  
  Published：25 December 2011
- 稿件说明：
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孙瑾秋, 周军, 张臻, 张永鹏. 基于能量累加的空间目标星像质心定位[J]. 光学精密工程, 2011,19(12): 3043-3048

SUN Jin-qiu, ZHOU Jun, ZHANG Zhen, ZHANG Yong-peng. Centroid location for space targets based on energy accumulation[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 3043-3048
孙瑾秋, 周军, 张臻, 张永鹏. 基于能量累加的空间目标星像质心定位[J]. 光学精密工程, 2011,19(12): 3043-3048 DOI： 10.3788/OPE.20111912.3043.

SUN Jin-qiu, ZHOU Jun, ZHANG Zhen, ZHANG Yong-peng. Centroid location for space targets based on energy accumulation[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 3043-3048 DOI： 10.3788/OPE.20111912.3043.

摘要

研究了CCD观测图像的亚像素级高精度质心定位方法以提高目标星像的天文定位精度。分析了影响定位精度的主要因素

如图像噪声、离散化采样误差及定位窗口选择等

结合CCD弥散斑的成像特性

提出了一种基于能量累加的空间目标星像质心定位方法。该方法使用插值方式降低离散采样点和实际感光区域光线照度的不一致性;利用弥散斑能量累加自适应地确定目标星像的有效窗口

优化目标星像灰度

消除随机噪声的影响;并采用平方加权质心定位方法进行质心计算。实验结果表明

该方法具有较强的抗干扰能力和稳定性

定位精度可达0.01 pixel

适用于低信噪比条件下的质心定位计算。

Abstract

Sub-pixel positioning technology for CCD images is proposed to improve the astronomical location precision of space targets.The main factors affecting the positioning accuracy of targe centroids

such as image noise

discrete sampling error and window size selection are analyzed. Combining with the CCD imaging characteristics for dispersion spots

a location method for target centroids based on energy accumulation is proposed. This method uses the interpolation technique to reduce the illumination inconsistency between actual sensitive area and discrete sample points

and uses the energy accumulation of dispersion spot to select the efficient target window for optimizing target gray and eliminating random noises. Finally

a squared weighted centroid localization method is taken to calculate the centroid position. Experimental results show that the method has strong anti-interference ability and stability.It can offer a positioning accuracy of 0.01 pixel and is suitable for a low SNR condition.

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references

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