Satellite side-sway angle obtaining method based on image characteristics

Abstract

A satellite side-sway angle obtaining method based on the image characteristics comprises the following steps: (1) obtaining the imaging date of a remote sensing image; (2) choosing a proper landmark on the remote sensing image, and obtaining latitude information of the landmark; (3) according to the parameters of the satellite orbit, obtaining the imaging local time (Tlocal) of the latitude of the landmark; (4) according to Tlocal, calculating the solar time angle (Tangle); (5) calculating the solar declination [delta] of the imaging date; (6) calculating the solar altitude according to [delta], Tangle, and the latitude (Lat) of the landmark; (7) measuring the shadow length (Lshadow) of the landmark on the remote sensing image, and calculating the height of the landmark (Height) by combining the solar altitude; (8) measuring the projection difference (Lproject) of the landmark on the remote sensing image, and finally calculating the side-sway angle (Sangle) when satellite imaging is carrying out according to the Height. The provided method can obtain the side-sway angle of a satellite through a remote sensing image by using the remote sensing satellite imaging mechanism and sunshine geometrical relationships, when the ephemeris data cannot be obtained.

Description

technical field

[0001] The invention belongs to the field of remote sensing image processing, and relates to a method for calculating a side swing angle of a satellite during remote sensing data collection according to the imaging time of the remote sensing image and the characteristics of tall buildings in the remote sensing image. Background technique

[0002] At present, most remote sensing satellites adopt sun-synchronous homing orbits, and the homing characteristics of sun-synchronous homing orbits can ensure that the sub-satellite points will coincide after a few days. However, the sun-synchronous return orbit usually has a long return period, and the return period of high-resolution remote sensing satellites generally ranges from 40 to 100 days. The maneuverability of remote sensing satellites can improve the timeliness of satellite data acquisition, which requires breaking the conventional sub-satellite point shooting mode and sideways the entire satellite or the cam...

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