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Strict imaging model and positioning method considering satellite fluttering

A technology of strict imaging model and positioning method, applied in the field of strict satellite imaging, it can solve the problems of satellite attitude modeling error, positioning error, inability to model, etc., and achieve the effect of improving positioning accuracy

Active Publication Date: 2014-05-14
TONGJI UNIV
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Problems solved by technology

However, due to the limitation of sensor sampling frequency, the method of model interpolation must be used to obtain the orbit and attitude information corresponding to each row of images
The modeling error of satellite attitude is one of the main error sources of satellite stereo positioning. The traditional attitude modeling method based on high-order polynomials and segmented polynomials cannot make a good analysis of the high-frequency attitude flutter phenomenon that exists during satellite operation. Good modeling, so that during the positioning process, there are positioning errors caused by high-frequency attitude flutter

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  • Strict imaging model and positioning method considering satellite fluttering
  • Strict imaging model and positioning method considering satellite fluttering
  • Strict imaging model and positioning method considering satellite fluttering

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Embodiment 1

[0076] The experiment uses the same-orbit three-view stereo image zero-level product of a domestic surveying and mapping satellite in a certain area in Henan Province, and the shooting time is February 2012. The image resolution is 2.1m for the bottom view and 3.5m for the front and rear views, and the coverage area is about 51km×50km. Three-view stereoscopic images such as figure 2 , 3, 4 shown.

[0077] The on-orbit test results of domestic surveying and mapping satellites show that during the period corresponding to the experimental data used, the satellite platform will be subjected to periodic flutter with a frequency of 0.63 Hz, and the amplitude of the flutter in the vertical orbit direction of the image is about 0.6 pixels. The along-track direction is about 0.3 pixels. Based on the obtained satellite flutter information, stereotaxic experiments were performed using a rigorous imaging model based on cosine superposition expressions.

[0078] A total of 27 ground GP...

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Abstract

The invention relates to a strict imaging model and positioning method considering satellite fluttering. The method includes the following steps that (1), posture fluttering is expressed through a cosine coincidence form; (2), the strict imaging model considering the posture fluttering is established; (3), parameters of the strict imaging model are determined; (4), the strict imaging model considering the posture fluttering is adopted for three-dimensional positioning. Compared with the prior art, the method has the advantages that the defect that a traditional posture modeling method based on a high-degree polynomial or a sectioned polynomial can not perform precise modeling on the high-frequency posture fluttering in the operation process of a satellite is overcome, so that in the positioning process, positioning errors caused by high-frequency posture fluttering are effectively compensated.

Description

technical field [0001] The invention relates to a strict satellite imaging method, in particular to a strict imaging model and a positioning method considering satellite flutter. Background technique [0002] Push-broom imaging linear array CCD sensors are widely used in the earth observation system of spaceborne space platforms. At present, on foreign commercial spaceborne sensors, the highest image resolution can reach 0.41 meters. Line sensor imagery provides a good data source for satellite mapping, remote sensing and GIS applications. In the production process of final data products such as DOM and DEM, the sensor imaging model and geometric orientation of images are the most basic and key issues, and their pros and cons directly affect the subsequent processing and the final accuracy of data products. The imaging model of the sensor reflects the corresponding relationship between the three-dimensional space coordinates of the ground point and the two-dimensional coor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 童小华徐聿升刘世杰叶真洪中华李凌云王凤香
Owner TONGJI UNIV
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