Centroid Location for Space Targets Based on Multi-step Information Entropy Energy Difference Method
GUO Xiaojun
XU Jian
MA Xinxing
LIU Feng
Abstract：The centroid accuracy of star tracker is the base of other accuracies .It's the base of celestial navigation ,star map identification ,orbit positioning and so on ,which is required to reach arc second scale .This paper analyses the main fac‐tors affecting the positioning accuracy of target centroid and the method for star target centroids based on multi‐step maxi‐mum information entropy is proposed .This method uses the linear superposition to narrow the centroid area ,using the sym‐metry of the stellar energy distribution to get the difference at centroid position and obtain the centroid ,then the validation comparison of simulated star images .Experiments show that the positioning accuracy of the method up to 0 .01 pixel ,has good effect to calculate the centroid of low SNR conditions .
Keywords：multi-stepinformation entropysub-pixelcentroid calculation
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 45-48 )