| Large spherical mold base is the manufacturing foundation of front antenna screen. The techniques and methods of quality control directly affect the accuracy and speed of processing, but also affect the positioning accuracy of the antenna mounting holes. In radio frequency simulation system experiments, the seeker head mounted on three-axis flight turntable receives the signals of target array radiation by microwave anechoic chamber to test device capability so that front targets’ location accuracy and positioning accuracy are of crucial importance.Aiming at the quality control of large spherical mould, the manufacturing process of mould, sphericity error, spherical diameter error were researched, different evaluation algorithm on sphericity error and repairing mould algorithm on spherical screen were summarized, a mathematical model based on MATLAB controlling algorithm had been established. The minimum zone method was adapted to the MATALB’s fmincon function on the basis of least square method. Considering the sphericity error and spherical diameter error as the control parameters, the functional relationship between the processing parameters and the least die repairing amount was determined.When installing the front screen and analyzing the blocks installation process, the key techniques of establishing coordinates based on the center of rotating turntable and detecting the feature points of antenna aperture array and initial position deviations of rotating turntable by laser tracker are put forward. This paper is written to study the express installation of front screen on the premise of reducing the accumulated errors through space shift algorithm, which takes the coordinate position of feature points as the control parameter. It also gives guiding advice to installation and adjustment quickly and timely.All the algorithms and designs described in the paper are validated by experiments and are of guiding significance to the quality control of front antenna screen. |
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