A Calibration Method of Inner Orientation Element Combining Digital Geometric Calibration Field and GCP

Abstract

The present invention provides an interior orientation element calibration method through combination of a digital geometric calibration field and a GCP. The method comprises the steps of: high-precision field operation ground control point arrangement and collection, manual interior work three-dimensional environment prick scheme, automatic measurement for the control point through adoption of the digital geometric calibration field data and through adoption of a density matching method, construction of an element exploration direction angle camera interior correction module and model parameter solution policy and method, and camera internal calibration parameter optimization model construction and model parameter solution. It is proved through practice verification that the internal calibration method is feasible and effective, stable and reliable in result and high in internal calibration precision, has been engineered and applied into a business remote satellite ground data processing system, is stable to operate, and can obtain a good engineering application effect.

Description

technical field [0001] The invention relates to a method for calibrating internal orientation elements combining a digital geometric calibration field and GCP, and belongs to the technical field of on-orbit geometric calibration and processing of remote sensing images. Background technique [0002] Although the camera on the satellite will be calibrated strictly in the laboratory before the satellite is launched, due to factors such as vibration during launch, outgassing of materials, changes in imaging conditions during orbit operation, and aging of devices, the camera's internal The azimuth element calibration parameters have changed, so it is necessary to perform in-orbit azimuth element calibration on the satellite. The in-orbit azimuth element calibration of the satellite is the key link for optical remote sensing satellites to achieve high-precision geometric positioning, and directly affects the internal geometric accuracy of satellite images. and band registration ac...

AI Technical Summary

Problems solved by technology

[0002] Although the camera on the satellite will be calibrated strictly in the laboratory before the satellite is launched, due to factors such as vibration during launch, outgassing of materials, changes in imaging conditions during orbit operation, and aging of devices, the camera's internal The azimuth element calibration parameters have changed, so it is necessary to perform in-orbit azimuth element calibration on the satellite. The in-orbit azimuth element calibration of the satellite is the key link for optical remote sensing satellites to achieve high-precision geometric positioning, and directly affects the internal geometric accuracy of satellite images. and band registration accuracy

[0003] Due to the higher and higher ground pixel resolution (GSD) of high-resolution satellites (Note: the GSD of the high-resolution satellite is 0.5m, and the WorldViewⅢ has reached 0.3m), and the calibration accuracy of the inner azimuth elements is getting higher and higher ( Note: It is usually required that the pointing angle calibration accuracy of the CCD probe is better than 0.3 pixels), so that the internal data of the digital geometric calibration field (including digital orthophoto data (DOM data) and digital elevation image data (DEM data)) The geometric accuracy is extremely high (note: the internal geometric accuracy of DOM data is better than 0.1m, and the elevation accuracy of DEM data is better than 0.5m). However, the internal geometric accuracy of the existing digital geometric calibration field data is about 0.3m. The calibration method of the inner azimuth element can not meet the requirements at all. If the digital geometric calibration field data with better precision is used, it will cost a huge amount of money. Therefore, it is necessary to aim at the high-precision inner azimuth element of the high-resolution satellite whose GSD is better than 0.5 meters. Special requirements for calibration, use appropriate methods for high-precision internal orientation element calibration

Images