Abstract:

In this paper,the author analyzes the characteristics of small POS data.The measurement error that caused by instrument accuracy can not be eliminated in the imaging process,the remaining phase error causes several targets appear azimuth defocusing and blur,which leads to the coordinate error of the image target point.The author applies the traditional directional parameter calculation method to Mini SAR single image locate,there will the number of ground control points,image coordinates,the tolerance of directional parameter error vector,terrain features,DEM resolution,the accuracy of POS data and other factors will affect the positioning results.When the high positioning accuracy is not necessary,polynomial interpolation of POS data results is more accurate than fitting.

Key words: small POS data, image coordinate error, orientation parameters, image positioning