Vibration Measurement Of Ship Borne Optical Equipment And Line Of Sight Jitter Error Analysis

The high precision ship borne optical equipment will be affected by the vibration of the waves and the engine,and the vibration on different ship speed and different installation positions are different,which leads to the reduction of the Los pointing accuracy of the optical equipment.And the regularity of the change is very complex,as a result,it is difficult to analyze its theory.In the design stage of the optical device,it is necessary to accurately evaluate the effect of different load excitation on the direction of the view axis.To optimize structure and reduce the vibration,will minimize the reduction of the axis pointing precision.In marine surveying and astronomical exploration,it is of great significance for the development of ship borne optical equipment to measure the vibration law accurately and analyzing the variation law of the different vibration.The vibration of different positions of ships at different speeds is measured,and the properties and changing rules of vibration are analyzed and summarized.The modal analysis of the ship borne optical equipment is carried out.The optimized design of the equipment structure is carried out according to the measured vibration data.The natural frequency of the equipment avoids the stronger frequency of the narrow band random vibration on the deck.The random vibration analysis of the whole structure is carried out to calculate the dynamic response of different locations of the equipment before and after optimization,so as to verify the effectiveness of the optimization.A model of ship coordinate calculation based on iterative subdivision algorithm is proposed,which converges the coordinates of different conversion sequence to real value,reduces the difference of view axis direction in the attitude calculation process,and improves the pointing accuracy of the view axis direction model.The quaternion method is used to establish an accurate axis pointing error model,and the contribution of each optical part to the axis jitter error of narrow band and wide-band vibration excitation,as well as the total visual axis jitter error is analyzed.The vibration of the optical axis of the optical system before and after optimization is compared.Finally,the corresponding vibration reduction measures and suggestions are put forward.