Research On Support Structure Of Space Light And Small Multi-mode Integrated Navigation Sensor

The navigation sensor is to capture the target through the optical system,process the image by digital technology,extract the target,solve the attitude and so on,so as to realize the navigation of the spacecraft.With the continuous progress of space science and technology in China,the functional requirements for space optical navigation sensors are becoming more and more diverse,and gradually towards the direction of high precision,integration,light and small,multi-mode development.In the past,the single band optical navigation sensor has not been able to meet the needs of space exploration at this stage.The development of high-precision and multi-functional optical navigation sensor has become a hot spot in the field of deep space exploration.Due to the severe space environment experienced by the navigation sensor,such as impact,vibration,microgravity,heat,vacuum,various radiation and electromagnetism,etc.,in the complex space environment,in order to ensure the high precision,light,small and multi-mode requirements of the navigation sensor,reasonable support structure design is bound to become the most important to improve the reliability of the navigation sensor system.In addition,the reasonable support structure design is to ensure the working life of the navigation sensor from assembly,inspection,various ground environmental tests,transportation and final on orbit operation,and it is also one of the important factors for each imaging optical element to maintain its accuracy and precision.Therefore,this paper studies the support structure of multi-mode common optical path navigation sensor,mainly including the following contents:First of all,the navigation sensor is a kind of space camera.The development status of space camera at home and abroad is investigated.Its main contents include the main mirror material and lightweight form,the main mirror support structure and the secondary mirror support structure.The optical system of the navigation sensor in this paper and the problems to be solved are introduced.Secondly,the main mirror and the main optical support structure are optimized.In the design of the main mirror,SiC material is selected and the back lightweight form of triangle is selected;after the integrated optimization of the mirror,the precision RMS value of the optimized mirror shape is better than ? / 50 through the spherical fitting method.When designing the supporting structure of the main reflector,the flexible structure is used to obtain the ability of rigid flexible coupling and optimize the structure position.When designing the secondary mirror support structure,the initial structure after topology optimization is optimized.Through the static and dynamic analysis,the support structure of the primary and secondary mirrors can ensure that the RMS value of the surface accuracy is less than ? / 50,the first-order mode is greater than 100 Hz,and the sine acceleration response amplification is not more than 5 times.Then the rest components of the navigation sensor are designed,which mainly includes the lens components,the supporting structure of lens and detector,the outer cylinder and laser rangefinder,etc.;the connection mode,materials used and relevant performance of the middle structure components of each component are studied to establish the basis for the analysis of the whole navigation sensor.Finally,through the static and dynamic analysis of the whole navigation sensor,the results show that the surface accuracy RMS value of each optical element is better than ? / 50,the first-order mode is greater than 100 Hz and the amplification factor of sine acceleration response is not more than 5.The analysis results are compared with the project requirements to verify the rationality of the whole design.