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Zhang L.-H.,Beijing Institute of Control Engineering | Li C.-Y.,Beijing Institute of Control Engineering | Cao D.-Y.,Beijing Institute of Control Engineering | Fan S.-H.,Zhengzhou Sunward Technology Co. | Fan Q.-H.,Zhengzhou Sunward Technology Co.
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2012

Referring to equidistant projection fisheye imaging model, self-calibration bundle adjustment for lunar rover hazard avoidance cameras are carried out by using the methods of calibration fields. The interior parameters and relative of exterior parameters of hazard avoidance cameras are calibrated. Using the obtained calibration parameters, the three-dimensional coordinates of the photogrammetry targets are recovered to get the three-dimensional coordinates of the targets hazard avoidance cameras coordinate system. Compare this three-dimensional coordinates with the known three-dimensional coordinates, and assess the calibration accuracy of hazard avoidance cameras by the comparative bias results. The experiment demonstrates the effectiveness of the calibration parameter models and the calibration method for the lunar rover hazard avoidance cameras. Source


Zhang L.-H.,Beijing Institute of Control Engineering | Cao D.-Y.,Beijing Institute of Control Engineering | Li C.-Y.,Beijing Institute of Control Engineering | Fan S.-H.,Zhengzhou Sunward Technology Co. | Fan Q.-H.,Zhengzhou Sunward Technology Co.
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2012

A method for verifying the distance measuring accuracy of spacecraft rendezvous and docking experiments with long-range distance sensors on the ground ranging measuring is brought forward. By using electronic theodolite industrial measurement system, the ranging sensor body coordinate system visibility is exported and control-points method is described. Using the high-precision geodetic control network and ranging sensors, describing the body coordinate system of a control field for unifying the coordinate system. The high-precision total station is applied to measure the distance of sensor reflective targets. The distance data of total station acquired is computed and results with the distance data from the ranging sensor is compared to get the distance measurement accuracy from the ranging sensor. Source


Zuo Y.-X.,Chinese Academy of Sciences | Li Y.,Chinese Academy of Sciences | Sun J.-X.,Chinese Academy of Sciences | Yang J.,Chinese Academy of Sciences | And 5 more authors.
Chinese Astronomy and Astrophysics | Year: 2011

Based on digital photogrammetric measurements, the antenna panels of the Delingha 13.7m radio telescope are adjusted to make the main dish have an optimal paraboloidal surface at the elevation of 52°, thus the overall antenna efficiency is optimized for different observing elevations. Observations indicate that the aperture efficiency of the telescope has been improved approximately twice in comparison with the antenna panels adjusted on the basis of theodolite measurements. According to the results of the measurements at different elevations, the models of antenna gravity deformation are built, including the displacement and tilt angle of the subreflector, as well as the focal length and surface error of the main reflector, as functions of elevation angle. In the process of modeling the gravity deformation of the main dish, instead of the direct calculation method, the least square fitting on the measured surface errors at different elevation angles is adopted, in order to reduce the effect of measurement errors on the accuracy of the model. © 2011. Source

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