Design And Accuracy Analysis Of Two Dimensional Intergrated Adjusting Mechanism For The Focal Plane In Wide Camera

Satellite remote sensing technology has developed rapidly in recent years,and remote sensing image plays a great role in military defense,land resources,disaster relief,agricultural development,city planning and other fields,to create a good economic benefit and has wide application market.With the increasing requirement of image quality,how to get a clear image has become a big problem in the course of the development of space camera.There is no ideal optical system.On the one hand,in the process of carrier,launch and on-orbit operations,vibration,shock,temperature,air pressure change and other factors will cause the camera imaging system of optical element of the refractive index change,relative position,face shape,mechanical parts have different degree of deformation and stress release,which eventually lead to optical focal plane position change,imaging position deviation theory,namely from coke is produced.On the other hand,the earth’s rotation,satellite attitude and orbit parameters will cause the space camera in orbit of imaging,satellite motion direction and an Angle between the direction of camera imaging,which is called drift Angle.From coke and drift Angle will cause the image is not clear or can’t imaging.Therefore,must be from coke and compensate drift angle in order to get clear remote sensing images,and the focusing and bias current technology is a vital link in the course of the development of space camera.This paper analyzes the mechanism of coke and drift angle from the influence factors of the quality of the images,then using the experience of the research at home and abroad about focusing and drift,put forward a set of suitable for a certain type space wide integration of focal plane of the camera two-dimensional adjusting mechanism,combining with the characteristics of the camera optical system.And at the same time,analyzing the accuracy of calculation by using the Monte Carlo method.Carry out the vibration test and test about the agency,after completion of the design.Test results show that the error distribution of the actuator is feasible and reasonable design,precision can satisfy the requirement of space imaging.And this paper mainly includes the following several parts:1.This paper summarizes the main factors of quality of camera imaging and commonly used compensation schemes at home and abroad.And determine the overall scheme of focal plane adjustment,based on the analysis of space camera use requirements and characteristics of optical system.2.This paper introduces the integration of focal plane two-dimensional adjusting mechanism drive solutions,determine the adjustment scope,material type,type motor and encoder,lubrication,etc.3.Analysis of error sources and establish the error transfer model of the organization,then using the matlab programming to solve the error transfer function based on the basic idea of Monte Carlo method.4.Carry out vibration test,the positioning accuracy of the test facility,focal plane shaking error parameters such as volume,empty back all the way,before and after the experiment.Comparing experimental results,the stability of the institutions and design accuracy was proved to meet the requirements.Results show that the control accuracy of the before and after the vibration test haven’t changed much,the focusing unit control precision is less than 0.01 mm,the biascurrent unit control precision is less than 10 ",focal plane rock mass were less than 10",excellent stability and self-locking mechanism,error distribution is reasonable.