Method for obtaining satellite solar angle and time on basis of satellite orbit characteristics

Abstract

A method for obtaining satellite solar angle and time on the basis of satellite orbit characteristics comprises the following steps: (1) according to the satellite sun-synchronous orbit characteristics, calculating the orbit inclination angle from the height of the satellite orbit; (2) according to the number of satellite orbits, calculating the longitude and Beijing time of sub-satellite point of the position where a satellite descending orbit intersects the equator, and converting the Beijing time into the local time so as to obtain the time of the position; (3) calculating to obtain the local times of any latitude where the satellite sub-satellite point pass; (4) according to the orbit injection error of satellite orbit inclination angle and the daily change rate of satellite orbit inclination angle during the operation process, calculating to obtain the change of satellite local time and actual local times of any latitude; (5) calculating to obtain the actual local time after satellite side-sway; (6) calculating to obtain the solar altitude, solar azimuth, and the Beijing time of an observation site. The provided method can precisely obtain the solar altitude, solar azimuth, and imaging time of a satellite according to a remote sensing satellite nominal orbit and changes thereof without knowing the satellite ephemeris data and specific imaging time.

Description

technical field [0001] The invention belongs to the field of remote sensing image information processing, and relates to a method for calculating satellite sun altitude angle, azimuth angle and observation time by using satellite sun synchronous characteristics and its evolution. Background technique [0002] Remote sensing image data has been widely used in land and resources survey and monitoring, disaster prevention and mitigation, agriculture, forestry and water conservancy, ecological environment, urban planning and construction, major national projects and other fields. At present, the orbit of remote sensing satellites generally adopts the sun-synchronous return orbit, that is, the nominal semi-major axis of the orbit and the orbital inclination are designed to ensure the sun-synchronous return characteristics. The sun-synchronous orbit is characterized by the same time when it passes through the same latitude, which can realize dynamic monitoring of the same area on ...

AI Technical Summary

Problems solved by technology

One method is to solve the problem based on the precise imaging date, time point and latitude and longitude information of the satellite remote sensing image, but this method will not be able to solve the problem when the imaging time of the remote sensing image is unknown; the other method is based on the nominal operation of the satellite. trajectory, but the method does not take into account the deviation of the satellite launch and the influence of various perturbation factors during the operation process, and there are certain errors in the calculation results

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