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

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,...

AI Technical Summary

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

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