Group Interaction of SEMS Modules at Control of an Adaptive Surface of the Main Dish

  • Andrey Yu. Kuchmin
Part of the Studies in Systems, Decision and Control book series (SSDC, volume 174)


Problem statement: Further improvement of quality of dish systems (DS) of large radiotelescope (RT) is bound to development of more perfect systems of the active correction of shapes of dishes and their relative position as it is impossible to create the metal construction having the required rigidity. The active correction assumes existence of the composite control system of DS using the modern measurement system with an accuracy λ/10 capable to predict deformations of DS and to develop cooperative control of drives of the DS elements for compensation of these deformations. Therefore SEMS modules can be used for these purposes. There are operating antennas with adaptive reflectors which facets move by means of adaptive platforms of Gough-Stewart, for example, as it is realized in the 500th meter radio telescope of FAST. Also similar systems are used for positioning of dishes of Naismith and counterreflectors (GTM, RT-13, etc.). In addition there is realization of basic fulcrum arrangements on Gough-Stewart’s platform, for example, the massif of anisotropy of relict radiation of Lie Yuanzhe, a radio interferometer from 13 elements (with a possibility of expansion to 19) on the rotary 6-m platform, the MMA project, a space radio telescope of Millimetron, etc. Purpose of research: development of algorithms for control of an adaptive surface of the main dish of the radio telescope consisting of adaptive facets which executive mechanisms are SEMS modules. Results: The algorithm of finding of the approximating paraboloid of the main dish taking into account features of executive mechanisms of SEMS modules, such as restriction for movements of rods of actuators and the line of their action. The algorithm of calculation of lengthenings of actuators as the setting influences in a control system of an adaptive surface is offered. Practical significance: the proposed algorithms for control of adaptive surface can be used in creating modern antennas for compensation of various external influences, such as weight and uneven heating.


Radio telescope SEMS Adaptive surface Approximating paraboloid 


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Authors and Affiliations

  1. 1.Institute of Problems of Mechanical Engineering, Russian Academy of SciencesSt. PetersburgRussia

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