The lunar's extremely high stability and the lunar reflections' dynamic range are comparable to the dynamic range of remote sensing instruments, making lunar calibration a popular on-orbit calibration method. In this paper, we propose a method for radiometric calibration of lunar observation data based on the visible channel of the FY-2F satellite. It adopted a series of operations such as screening the available time series by orbit simulation, screening of lunar images and their extraction, calculating the integrated irradiance of the lunar disk, distance correction, and lunar phase correction using the ROLO lunar irradiance model, and finally obtaining the radiation response variation of the visible channel of the FY-2F satellite by linear regression. The results show that the annual attenuation of the scanning radiometer visible probe element of FY-2F is about 1.98%, which is close to the results of other calibration methods; therefore, the effectiveness of this method is proved. The lunar calibration method in this paper can effectively monitor the radiometric response attenuation of the FY-2F satellite and provide a reference for the calibration of the systematic bias of the radiometer.
Based on the theory of reflection and rotation for vector, this paper theoretically analyzes the scanning scheme by rotating the coaxial two-mirror, and constructs the transformation matrix for vector. On this basis, the relationship between the five control parameters for the scanning scheme by rotating coaxial two-mirror and the scanning trajectory (corresponding to different scanning strategies) is deeply analyzed. The scanning scheme by rotating the coaxial two-mirror designed and analyzed in this paper has the advantages of simple control (with uniform circular motion), high scanning efficiency (100%), and flexible scanning strategy and so on. It can realize the functions of rapid scanning for imaging, region ergodic searching, random or complex path for scanning and so on.
In order to break through the bottlenecks for traditional optical mechanical scanning system (lower imaging frame frequency and difficult to control), this article analyzed the rapid scanning technology for imaging with high performance based on rotating of two-mirror. By using rotation of two-mirror instead of swinging back and forth for traditional scanning mode, we achieved scanning pattern with high linearity in the large field, while scanning fast, and 100% for scanning efficiency, the difficulty of system controlling is also reduced. This technology can effectively surmount the technical challenges of various optical imaging systems currently (especially for the terahertz detection system) in security screening field which requires high speed of scanning for imaging. Based on the theory of specular reflection and rotation for vectors, this article discussed and simulated several kinds of rapid scanning system for imaging by rotating of two-mirror in detail, such as Newton Telescope, Ritchey-Chretien or Gregory Telescope, dual 45 degree mirror system, fore based 45 degree mirror system,and so on. And then we obtained the quantitative relationship between the parameters of rotation for mirror controlling and the scanning trajectory in this paper. On this basis, this article compared and analyzed the performance for the series of two-mirror systems listed above which realized fast scanning for imaging, including the scanning range and scanning linearity. The results calculated in this paper can provide guidance for the selection of the structure and the optimization design of the scheme for the rapid scanning system for imaging
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