Centroid location for space targets based on energy accumulation

Jin Qiu Sun, Jun Zhou, Zhen Zhang, Yong Peng Zhang

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

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.

Original languageEnglish
Pages (from-to)3043-3048
Number of pages6
JournalGuangxue Jingmi Gongcheng/Optics and Precision Engineering
Volume19
Issue number12
DOIs
StatePublished - Dec 2011

Keywords

  • Astronomical measurement
  • Centroid location
  • Energy accumulation
  • Space target

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