Star point extraction system and method of star sensor

The invention discloses a star point extraction method of a star sensor. The method comprises the following steps: establishing a star point energy distribution model under a dynamic condition; predicting a current moment coordinate of the star point, and windowing by taking the current moment coordinate of the star point as a center; taking the star point energy distribution model under the dynamic condition as a template, calculating correlation point by point in a window, and taking a region with the maximum correlation as a region where a star point is located; and covering the region where the star point is located by using the star point energy distribution model under a dynamic condition, and calculating the coordinates of the star point by using a gray weighted centroid method. According to the invention, the star sensor dynamic model is used as a template, and the correlation is used as a basis so that the star point extraction rate and extraction precision of the star sensor under a large dynamic co