| With aerial photogrammetry system development and high-resolution satellite launched, more and more remote sensing images is produced for various scale mapping industry application, but at the same time the advanced requirement of the target positioning accuracy of the sensor imaging data is raised. The positioning accuracy is directly affected by the indicator of the technical parameters of the sensor. It has particularity of Space remote sensing system calibration and the calibration of the aerial remote sensing system. Space remote sensing system once the launch will not be able to conduct laboratory calibration must be used in all ground calibration field test on the imaging modality differences result in different calibration method. Therefore, based on airborne and spaceborne linear array sensors rigorous geometric imaging model of sensor on-orbit calibration models and methods is discussed.This article studies for geometric accuracy factors affect the image position based on the aerospace line sensors rigorous geometric imaging model, comparative analysis of the similarities and differences of the aerospace lines sensors in imaging modalities, then on camera calibration covered by the error of exterior and interior orientation elements, then analyzed from the theoretical analysis of the line sensor image geometric calibration parameters and calibration methods.First, we discussed on the basis of the analysis of airborne line sensor imaging principle, the POS integrated sensor spatial orientation model and camera calibration mathematical model based on ground test site, on this basis, the need for conventional calibration methods in laying a large number of field control point, and the calibration field position immovable shortcomings, propose alternative ground calibration field to flight levels and strip structure camera calibration;Subsequently, by analyzing the factors of influence spaceborne sensor geometric positioning based on rigorous geometric spaceborne sensor orientation model to determine the parameters of the satellites in orbit geometric calibration content: elements between the cameras and satellite platforms and high-precision calibration of the inner orientation elements. Finally, based on high-precision control data of calibration field, pushbroom satellite images are acquired to compute geometry calibration parameters. The main content for pushbroom satellite images is strictly related to the geometric model construction, the calculation of calibration parameters based on rigorous geometric model and geometric calibration accuracy validation. Looking at the text of the main content and innovative point of this article is as follows:1) Using rigorous geometric imaging model for the geometric calibration of airborne and spacebome linear array sensor image, it summed up the inside and outside of the rigorous geometric imaging model calibration parameters and calibration methods in theory;2) It has proposed route structure to alternative ground testing ground for airborne three-line sensor calibration. Sources of error in the upload the ADS40image orientation process by theoretical analysis machine, depending on additional parameters, the additional parameters and coordinates unknown, the correlation between the collimation and additional parameters. In order to obtain reliable calibration results of block adjustment parameters, the correlation must be removed. Refer to airborne sensorsground-based experimental field calibration adjustment, route structure transformation to removal of the correlation between the various error parameters for bundle adjustment;3) It has proposed that testfield calibration to strip structure for the three-line sensor ADS40Airborne calibration. Reference to airborne sensors based on the the ground experimental field calibration bundle adjustment. Through experimental design calibration and validation data, it is verified the feasibility of camera calibration by two-flight levels cross strip structure, and demonstrate its applicability, and finally using two different sets of real geometric calibration field of high-precision ground-based ADS40data, the contrast experiment is proved the correctness of the calibration method;4) Using the the collinear equation error equation coefficients of correlation, derived by linear the bias matrix model as the conclusion of the spaceborne sensor exterior orientation elements error model. By theoretical analysis and simulation experiments, geometric positioning errors caused by the elements of exterior orientation error has been proved, and finally through the experiment of ZY3satellite data, the bias matrix used for the exterior orientation elements calibration is feasible. Then, it has been probed that pointing angle model calibration orientation elements for satellite images. The introduction of the probe pointing angle to the spaceborne sensor image orientation, and analyze the error term is absorbed by the probe element pointing angle parameters, proved by both theoretical and experimental exploration element pointing angle model for spaceborne sensors within calibration of the applicability of orientation elements. 5) It is used ZY3satellite data by Songshan calibration field experiment to test the calibration model for scaling feasibility, and given satellite in-orbit calibration the ground testing ground control point number and distribution of appropriate programs. Specific ZY3satellite experimental data to give geometric calibration model of how to apply the in rigorous geometric imaging model calibration process in particular: building a rigorous geometric imaging model, exterior orientation parameters calibration, point angle vector calibration step. Finally, this section designed a series of experimental data to verify the number and distribution of the control points of the ground calibration field to meet the the spaceborne sensors geometric calibration accuracy requirements, besides the appropriate values of these two parameters is given in the actual processing and broad applicability. |
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