Study On The Key Technologies Of Spaceborne Integrated Sensor Orientation

This dissertation makes a comprehensive analysis and study on referred theory and key technology for the high-precision integrated sensor orientation of high-resolution remote sensing satellites linear array CCD imagery, the followings are what we have done in the disertation:1. The observation data of spaceborne position and attitude determination device as the observed value, the general polynomial model, orientation image model and piecewise polynomial model have been established for describing the change of exterior orientation elements, which laid a theoretical basis for spaceborne integrated sensor orientation and in-flight calibration.2. Through analyzing and researching imaging geometry and physical properties of high-resolution remote-sensing satellite linear array CCD imagery, a simulation data have been generated for single linear array CCD and three linear array CCD, which provides data basis to validate dynamic calibration of photogrammetry parameters theory based on simulated data subsequently.3. Three high-resolution satellite imagery rigorous geometric imaging model have been built, and use the integrated sensor direct orientation method to verify the correctness of rigorous geometric imaging model uses the real image data; considering satellite attitude data system errors, the calibration of constant angular error model and the attitude quaternion systematic error compensation model for different high-resolution satellite remote sensing imagery data have been constructed respectively and experimentally verified the attitude angle systematic error compensation effectiveness and correctness.4. Taking into consideration the actual situation which laboratory calibration parameters will no longer suitable because of the satellite launch and in orbit runing, the photogrammetry internal and external parameters calibration model have been put forward, and using simulated data to verify the correctness of calculation model for photogrammetry internal parameters calibration model, and the calculation of photogrammetry parameters based on ground calibration field for three high-resolution satellite imagery have been achieved, experiments show that after dynamic calibration of photogrammetry parameters can effectively improve the directly target positioning accuracy of the high-resolution satellite imagery.5. The exterior orientation elements which established is introduced into bundle adjustment, the spaceborne integrated sensor orientation theory based on the general polynomial model, piecewise polynomial model and orientation image model are then studied, the adjustment precision of high-resolution satellite imagery have been compared through different experimental schemes which are multiple sets of experimental data, a variety of control point distribution scheme, different segments of piecewise polynomial model, different orientation image numbers of orientation image model and so on, and the positioning accuracy can be achieved for the spaceborne integrated sensor orientation have been comparative analysis on the dynamic pre-calibration and post-calibration of photogrammetry parameters.6. For residual systematic errors post-calibration, reasonable choice additional parameters for different high-resolution remote sensing satellite imaging sensors, the spaceborne integrated sensor in-orbit calibration model has been established, a new process flow for the high-resolution satellite imagery geometry processing has been provided.