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An on-orbit self-correction positioning method based on optical image

A positioning method and optical imaging technology, applied in satellite radio beacon positioning systems, instruments, measurement devices, etc., can solve the problems of positioning parameter offset, positioning failure, and positioning accuracy decline, reduce time-varying error sources, improve The effect of positioning accuracy and improving timeliness

Active Publication Date: 2022-02-18
SHANGHAI AEROSPACE COMP TECH INST
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Problems solved by technology

[0002] With the cooperation of ground control point information, the current on-orbit positioning based on optical images has been able to obtain high positioning accuracy, but in some occasions (on the sea) it is not easy to obtain ground control point information. It is also impossible to achieve real-time correction of ground control points, so how to achieve high-precision on-orbit positioning without control points (or calibration of a small number of control points) is an urgent technical problem to be solved
[0003] When performing on-orbit positioning based on optical satellite images, due to the existence of various time-varying errors in the system (deformation caused by temperature, orbital drift, elevation change, etc.), the positioning parameters will deviate from the calibration value after the system has been working for a certain period of time, resulting in positioning errors. Accuracy drops
In this case, if there is no ground control point (for example, no effective ground control point can be found on the sea) to re-calibrate, it will cause the positioning to fail

Method used

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  • An on-orbit self-correction positioning method based on optical image
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Embodiment Construction

[0029] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0030] The basic train of thought of the present invention is: at first adopt double DSP (the first DSP and the second DSP) to process in parallel, the first DSP handles direct positioning independently, and the positioning result is sent to the second DSP as relative " control point ", and the second DSP Use the relative "control point" information to correct the parameters of the current geometric positioning model on the star. After the correction, use the point with the same name to judge the rationality of the correction result. Once the correction result is judged to be reasonable, the correction result will be sent to the first DSP. Update the positioning parameters and iterate in turn to eliminate the time-varying error of the system; at the same time, using the relative reference point can well compensate the error caused ...

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Abstract

An on-orbit self-correction positioning method based on optical images, comprising the steps of: using ground control point information to calibrate the relevant parameters of the on-board geometric positioning model, and annotating the calibrated relevant parameters on the star; combining the calibrated parameters The relevant parameters are directly positioned by using the onboard geometric positioning model, and the result obtained from the positioning is used as the relative control point of the next frame of data; the relative control point is used to self-correct the relevant parameters; it is judged whether the self-correction result is reasonable. The correction results update the relevant parameters. It can also reduce the time-varying error source of the system and improve the positioning accuracy without the need for ground control points. Through loop iteration, the influence of elevation change on positioning accuracy can be eliminated, so there is no need to store elevation library information during orbit processing. Using dual DSP parallel processing can greatly improve the timeliness of positioning.

Description

technical field [0001] The invention relates to a target positioning detection technology in the field of optical satellite remote sensing images, in particular to an on-orbit self-correction positioning method based on optical images. Background technique [0002] With the cooperation of ground control point information, the current on-orbit positioning based on optical images has been able to obtain high positioning accuracy, but in some occasions (on the sea) it is not easy to obtain ground control point information. It is also impossible to achieve real-time correction of ground control points, so how to achieve high-precision on-orbit positioning without control points (or calibration of a small number of control points) is an urgent technical problem that needs to be solved. [0003] When performing on-orbit positioning based on optical satellite images, due to the existence of various time-varying errors in the system (deformation caused by temperature, orbital drift,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/23
CPCG01S19/23
Inventor 张宇韩传钊谢宝蓉丁荣莉李杰冯书谊
Owner SHANGHAI AEROSPACE COMP TECH INST
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