ing at the limitation of the measurement conditions in most of the measurement implementation experiments, a method for measuring the binocular vision motion parameters based on dual cameras without points with the same name is proposed. The initial values of position and pose are calculated by the method, and the initial values are optimized by the global orthogonal iterative algorithm. The measurement method does not need the participation of the same name point in the realization process, but only needs more than 6 target cooperative mark points in the field of view of two cameras, so as to obtain the position and attitude parameters of the validator in the process of motion. The hovering, obstacle avoidance, and landing stage of the spacecraft are tested. The measurement method is compared with the binocular pose measurement method based on the same point, the monocular pose measurement method based on orthogonal iteration and the implied value of total station. The default value obtained by the station instrument is compared. The attitude measurement error is less than 0.5°, and the position measurement error is less than 0.01 m.
.ing at the problem of distortion of the panoramic image collected by the conical catadioptric panoramic imaging system, a panoramic image expansion method of inner surface of cylindrical objects under the conical bidirectional projection model is proposed. Forward and reverse projection models with distortion parameters are established, first, the pixels of the panoramic image of cylindrical inner wall are reversely mapped to the expanded image, and then forward the missing pixels in the expanded image to the original panoramic image, through the panoramic image and the expanded image corresponding to the coordinate mapping relationship of the pixels, the expansion of the panoramic image of cylindrical inner wall is realized. The experimental results show that the tangential and radial distortion of the panoramic image of cylindrical inner wall are corrected better, the positioning accuracy of the bidirectional projection model of the cone surface is sub-pixel level, comparing with the approximate expansion method of concentric rings, the information entropy and the average gradient are both improved to different extents, it can be effectively applied to the expansion of panoramic images of cylindrical inner wall.
.ing at the photoelectric performance measurement for GaInP/InGaAs/Ge triple-junction solar cells used in aerospace, we introduce the solar simulator method and the high altitude balloon method. The measurement principle of the solar simulator method and the traceability chain of key values are described. Based on the dual light source steady state solar simulator and the spectral mismatch analysis, the photoelectric performances of the GaInP/InGaAs/Ge triple-junction solar cells are measured, and the key parameters such as short circuit current, open circuit voltage, maximum power and their corresponding temperature coefficients are obtained. In addition, we introduce the high altitude balloon calibration method. The GaInP/InGaAs/Ge triple-junction space solar cells are carried by the Helium balloon to arrive at the altitude higher than 35 km and their photoelectric performances under high altitude natural sunlight are measured. Simultaneously, their current-voltage characteristic data and the real-time temperature data are collected. After temperature correction, the data collected under high altitude natural sunlight is compared with that by the solar simulator method. The results show that the maximum relative deviations in the short circuit current, open circuit voltage and maximum power are 2.61%, 2.13% and 1.63%, respectively. It means that there is a good consistency between these results of the two measurement methods.
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