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

An optical satellite and geometric positioning technology, applied in the field of satellite remote sensing data processing, can solve the problems that the internal and platform installation parameters of the optical camera cannot meet the requirements of satellite positioning accuracy, and the geometric calibration cannot be
CN106403902AActive Publication Date: 2017-02-15WUHAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN UNIV
Publication Date
2017-02-15

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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.
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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'...

Claims

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