Satellite image geometric calibration method considering complete regression period
A satellite image and geometric calibration technology, applied in the field of satellite remote sensing, can solve problems such as poor applicability, restricting high-resolution satellite image in-orbit high-positioning processing, and not considering satellite image conditions, etc., to achieve the effect of improving calibration accuracy.
Pending Publication Date: 2022-08-02
北京市遥感信息研究所
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[0004] Because the conventional geometric calibration method mainly adopts the conventional geometric calibration model, the on-orbit geometric calibration is performed using a single-view satellite image of a certain calibration field area, without considering the satellite image conditions in different places during the entire satellite return cycle, and cannot The change of camera parameters caused by the large difference in solar radiation when imaging at different places in the same region within the calibration regression period makes the applicability of the calibration parameters to images at different places in non-sun-synchronous orbit satellites relatively poor, which restricts the On-orbit high positioning processing of high-resolution satellite images, so it is urgent to solve the technical problem of on-orbit geometric calibration at different places in the return cycle of non-sun-synchronous orbit satellites
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[0049] In order to better understand the content of the present invention, an embodiment is given here.
[0050] like figure 1 As shown, the present invention discloses a satellite image geometric calibration method considering a complete regression period, including:
[0051] S1, acquiring satellite image sets when the satellite is at different places in the same fixed standard field in at least one complete satellite return cycle;
[0052] S2, performing ground control point matching with each satellite image in the satellite image set obtained in step S1 with the orthophoto of the calibration field and the digital elevation model, respectively, and obtaining the satellite image set in the satellite image set along the direction of the satellite orbit. Image coordinates and object coordinates of ground control points evenly distributed in multiple rows of continuous pixels; the ground control points are located in the calibration field.
[0053] S3, establish a first geome...
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The invention discloses a satellite image geometric calibration method considering a complete regression period. The method comprises the following steps: acquiring a satellite image set at different places of the same calibration field in a complete satellite regression period; based on the calibration field control data, acquiring control points uniformly distributed in multiple rows of pixels in the satellite image set along the satellite orbit direction; selecting a control point in one reference local time image, and obtaining a camera calibration parameter of the local time based on a first geometric calibration model; constructing attitude error compensation models at different places, and establishing a second geometric calibration model considering a satellite complete regression period; calculating to obtain attitude compensation parameters by using control points in the time images at other places; and updating a calibration file based on a second geometric calibration model according to the camera calibration parameters at the reference place and the attitude compensation parameters at different places. According to the invention, unified calibration of satellite images in different places in the same area can be realized, and the calibration precision is improved.
Description
technical field [0001] The invention relates to the technical field of satellite remote sensing, in particular to a satellite image geometric calibration method considering a complete regression period. Background technique [0002] Carrying out high-precision ground calibration of satellite images is a prerequisite for high-resolution satellite image high-positioning processing. At present, the high-resolution satellite image calibration method mainly adopts the conventional geometric calibration model. The camera parameters are calibrated on-orbit in the satellite image of the time calibration scene, and then the parameters are applied to the image processing of the whole satellite in various places. This calibration method has a good effect in the on-orbit geometric calibration of sun-synchronous orbit satellites, and is also the positioning method adopted by most of the currently in-orbit satellites, and has good universality. [0003] However, for the high-resolution ...
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IPC IPC(8): G01C25/00G06T7/80
CPCG01C25/00G06T7/80
Inventor 龙恩吕守业王红钢赖广陵曲小飞李蕊白龙
Owner 北京市遥感信息研究所