The Ship Motions Effect on the Position Reference of Telescope's Axis Installed on the Deck of a Ship

摘要

The existing solutions in control of trajectory measurement telescopes installed on a deck of the ship require a gyro-stabilized platform. However, gyro-stabilized platform has bad dynamic characteristics, which influence on the precision of measurements. Therefore, it is necessary to develop a control system without a stabilizing device, which will compensate the ship's motions by precision electric drive of axis itself. Among others, there is a problem of investigating the influence of ship motions on the control system reference signal. In current research the mathematical model of position reference signal takes includes models of six kinds of ship motions. As a result, the authors have studied the influence of ship motions on the position reference signal for the variety of trajectories where azimuth and elevation are in range of [0°; + 90°]. The proposed mathematical model of ship motions allows determining the range of target coordinate, within which the electric drive can provide the required acceleration. The article may be helpful for developers of precision electric drives of sea-based telescopes.