Study On Theories And Methods Of Linear CCD Sensor Geometric Calibration Based On Field

The sensor on-orbit geometric calibration relying on the field is a necessary work to assessand optimize the geometrical performance of sensor system and ensure the accuracy andreliability of remote sensing positioning. The thesis focused on the airborne and spaceborneCCD sensor field geometric calibration and solved parameters setting, model building,calibration solution, assessing and verification and other key issues. A systematic and in-depthstudy was carried out on field calibration theory, method and technical system of imaging sensorand GPS positioning and IMU attitude determination equipments. The main work andinnovations in the thesis are listed as follows.1. Based upon the analysis and summary of the current status quo and development trend ofairborne and spaceborne linear array CCD sensor field geometric calibration, it discussed thetask, needs, and technology system of sensor field calibration.2. Analysis and investigation was made on the theory, method, and key technologies ofself-calibration and the technical solution program was decided. In combination with thestructural characteristics of current linear CCD sensor, a deep analysis was made on its variouspotential error sources under dynamic imaging conditions, and corresponding mathematicalmodel was constructed, which laid the theoretical foundation for sensor self-calibration.3. From the technical requirements of sensor filed calibration and absorbing the experiencesof domestic and foreign typical remote sensing fields, an in-depth analysis was carried out onfields construction methods, principles and key requirements, and some instructive conclusionswere drawn out.4. Strict imaging model, direct image positioning model and GPS/IMU auxiliary datasupported bundle adjustment model were constructed for airborne three-line array sensor. It putforward an equivalent error equation-based self-calibration bundle adjustment method for lineararray CCD images, which achieved fast and efficient computation for ADS40imageself-calibration block adjustment.5. It put forward an ADS40camera error model, built an airborne integrated sensorself-calibration joint adjustment model, and designed a set of relatively complete ADS40self-calibration program. Experimental results showed that using the proposed model andprogram, it can effectively achieve the dynamic calibration for ADS40sensor parameters andsignificantly improve the image positioning accuracy. 6. The strict imaging model and its corresponding revised form of spaceborne linear arrayCCD sensor were analyzed and constructed. Thereby, a bundle adjustment system was built forspaceborne linear array CCD images, which can effectively realize the block adjustment fortypical high resolution satellite images as ZY-3TLC, SPOT-5HRS and ALOS PRISM. Anattitude system error calibration method was proposed for satellite images and experimentalresults proved the actual effect of compensating attitude system error, which can greatly enhancethe image positioning accuracy.7. It put forward an error model for ZY-3three-line array sensor, proposed a multi-sensorself-calibration joint adjustment model, and designed a set of relatively complete geometriccalibration programs for spaceborne linear CCD sensor. Experimental results demonstrated thatafter on-orbit calibration for ZY-3three-line array sensor using the above model and program,the positioning accuracy improvement in the plane was over20%, and that in the height wassuperior to10%.