Abstract
Abstract. The Sardinia Radio Telescope (SRT) is a 64 m diameter antenna, whose primary mirror is equipped with an active surface capable to correct its deformations by means of a thick network of actuators. Close range photogrammetry (CRP) was used to measure the self-load deformations of the SRT primary reflector from its optimal shape, which are requested to be minimized for the radio telescope to operate at full efficiency. In the attempt to achieve such performance, we conceived a near real-time CRP system which requires the cameras to be installed in fixed positions and at the same time to avoid any interference with the antenna operativeness. The design of such system is not a trivial task, and to assist our decision we therefore developed a simulation pipeline to realistically reproduce and evaluate photogrammetric surveys of large structures. The described simulation environment consists of (i) a detailed description of the SRT model, included the measurement points and the camera parameters, (ii) a tool capable of generating realistic images accordingly to the above model, and (iii) a self-calibrating bundle adjustment to evaluate the performance in terms of RMSE of the camera configurations.
Highlights
The Sardinia Radio Telescope is a state-of-the-art radio telescope managed by the Italian National Institute for Astrophysics (INAF)
We deal with the design of a Close range photogrammetry (CRP) system where the cameras are physically bound to the radio telescope
We studied the performance of MicMac and AICON 3D Studio in computing the spatial coordinates of targets by processing the measurements produced by different camera configurations
Summary
The Sardinia Radio Telescope (http://www.srt.inaf.it) is a state-of-the-art radio telescope managed by the Italian National Institute for Astrophysics (INAF). The antenna is located 45 km far from Cagliari, the administrative capital of Sardinia (Italy). SRT, shown, is a Gregorian alt-az mount radio telescope 70 m tall and 3000 t weigh, with a 64 m diameter primary reflector. The alidade, a steel made structure 35 m tall, is able to support and move the primary reflector via 16 wheels acting on a 40 m diameter rail, around the azimuth axis. SRT exploits multiple focal positions and a wide frequency range. The receivers (the detectors) may be positioned in a few minutes on the appropriate focal position by means of robotic drivers giving a great “frequency agility” to the antenna
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