Pixel-Level Radiometric Calibration Research Of Large Aperture And Wide Field Of View Optical Remote Sensor

From the 1960 s,the research and application of remote sensing technology were widely focused by the world.Countries around world had carried out the development plans in the field of remote sensing.Optical remote sensor which is regared as typical remote sensor plays an important role in the area of homeland security,resource exploration,weather report,environment monitoring and military reconnaissance.With the development of remote sensing,the requirement of quantitative remote sensing is higher and higher.Radiometric calibration is an importance link in the remote sensing image process,which plays an important role in high precision sensor development.The main purpose of radiometric calibration is to establish the relationship between input light radiation and output electric signal,which could adjust and test the radiation response,image uniformity,image consistency and relative radiation correction,and finally confirm the coefficient of calibration and radiation response.The optical remote sensors are in the development of large aperture and wide field of view.In this situation,the conventional equipment and method would no longer satisfy the radiometric calibration requirement.Hence,it is essential to carry out the research about the radiometric calibration of optical remote senor with large aperture and wide field of view.The improvement programs have been put forward basing on the problem analysis of conventional calibration method and the calibration equipment.The problem of conventional calibration method and equipment were summarized by analyzing the experiment calibration content and calibration process.The detect model of remote sensors usually consists of a few detectors especially for the wide field of view remote sensors which could cause the response inconsistency phenomenon.To solve this problem,the DSS calibration method basing on the standard was proposed.The DSS calibration experiment was taken to make the inconsistenct lower.The multiple fields spectral calibration method was presented to carry out the spectral calibration of large aperture and wide field of view remote sensors.Basing on the analysis of radiation transfer model,the calibration algorithm of this new method was established.The spectral calibration experiment was made to acquire the spectral response and relevant parameter,and the uncertainty was analyzed.The improvement projects were proposed to solve the radiometric calibration problem of large aperture and wide field of view remote sensors.An ultra-large aperture integrating sphere uniform light source was developed to better accomplish the radiometric calibration of remote sensor by the NES method.Combining with the defect of traditional design,the improvement program was presented.As the sphere aperture is much larger than before,the problem of radiometric performance measurement arose.Hence,the new radiometric performance measuring devices basing on multi-detectors were developed to solve this problem.The consistency algorithm was applied to make multi-detectors consistent.The radiometric calibration experiment was taken by using this new developed integrating sphere,and the calibration results were calculated and summarized.Finally,the uncertainty of calibration experiment was analyzed.In addition,the radiometric calibration basing on the Jones method was conducted.The calibration model and radiation response algorithm were established.The calibration equipment of Jones method was developed and calibrated to carry out the radiometric calibration experiment of remote sensor.The experiment results were summarized and uncertainty of calibration experiment by the Jones method was analyzed.The necessity of pixel-level calibration which could improve the phenomenon of un-uniformity between the pixels was analyzed.The new calibration algorithm basing on the specialty of large aperture and wide field of view remote sensor was established by discussing multiple calibration methods.The pixel-level radiometric calibration experiment was taken,and the radiation response results were summarized and analyzed.Finally,the calibration effect was verified through the field imaging experiment.