Regional target equal-area grid segmentation method and system for earth observation satellite

Abstract

The present application provides a kind of regional target equal-area grid partitioning method and system of earth observation satellite, comprising: 1) the orbital elements of satellite in instantaneous inertial coordinate system is calculated.2) the over-the-top time and side swing angle of each corner point of regional target by satellite is calculated.3) in the direction of vertical nadir track, between minimum side swing angle and maximum side swing angle, every distance d1 is divided into a strip.4) in the direction along the track of nadir point, every distance d2 is grid divided to the strip, and the grid area is d1*d2.5) the longitude and latitude coordinates of the four corner points of d1*d2 small grid are calculated.6) whether the small grid is covered by regional target is judged.7) the d1*d2 small grid covered by regional target is synthesized into d1*d1 large grid, and the number of large grid is counted.8) the strip is moved, and the moving distance is d2 each time, and the strip is moved d1 / d2-1 times, and 3)-7) are repeated, and the coordinates of the four corner points and the center point of each large grid when the number of large grid covered by regional target is least are output.The present application can reduce the total energy consumption of satellite.