Satellite-ground cooperative in-orbit real-time geometric positioning method and system for optical satellites

Abstract

The invention provides a satellite-ground cooperative in-orbit real-time geometric positioning method and system for optical satellites. The method comprises the following steps: an optical satellite imaging and positioning model suitable for an onboard real-time processing unit is constructed, initial values of onboard positioning model parameters are acquired by calibration parameters or design parameters for camera interior and platform installation relation by a ground laboratory, after the satellite is in orbit, ground calibration field image data is acquired and downloaded, calibration matching and calibration parameter calculation are completed in a ground processing system by using the downloaded calibration field images; calibration results are verified and model parameter annotation is updated. The method and the system aim at limitation of onboard processing environment, and combine the ground processing system, so that a satellite-ground cooperative processing mode is formed, in-orbit high-precision real-time geometric positioning of optical remote sensing satellite is realized, application usefulness and timeliness of earth observation systems are improved, and necessary bases are provided for intelligent and high-efficient remote sensing data onboard real-time processing technology.

Description

technical field [0001] The technical solution of the present invention belongs to the technical field of satellite remote sensing data processing, and in particular relates to a method and system for on-board geometric positioning processing of optical satellites coordinated by satellite and ground. Background technique [0002] With the improvement of image resolution, the amount of data acquired by optical remote sensing satellites has grown exponentially, far exceeding the development of data compression and transmission capabilities, resulting in the inability to download real-time data acquired on the satellite in time. Taking the Gaofen-2 remote sensing satellite as an example, the satellite’s original acquisition data rate reaches 7Gb / s. If the conventional compression transmission method is adopted, the real-time download of all acquired data cannot be completed through a 2*450Mbps data transmission link, which seriously restricts It improves the timeliness of users'...

AI Technical Summary

Problems solved by technology

[0004] The high-precision geometric positioning of optical satellites depends on the precise imaging geometric model parameters. Due to the influence of factors such as stress release during satellite launch, space thermal environment and mechanical environment during satellite operation, the calibration of optical camera internal and platform installation parameters in ground laboratories Unable to meet the accuracy requirements of satellite positioning

At present, the ground system processing generally adopts the geometric calibration method based on the ground calibration field, and the image data of the geometric calibration field obtained when the satellite is in orbit is used for the refined calculation of the model parameters, while the geometric positioning technology on the satellite is limited by the storage environment. and the constraints of the processing environment, it is impossible to perform geometric calibration on the star

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