| The millimeter wave atmospheric sounder of stationary orbit has the advantage of real-time three-dimensional monitoring and prediction for the disastrous weather,which is the strategic commanding point to all countries.After years of unremitting efforts,China has entered the forefront of the world.At present,in this field,research achievements in China,"the prototype of the orbit millimeter wave atmospheric sounder" are successfully developed by the CAS Space Center and the ESA.To obtain accurate observation data continually,the atmospheric sounder needs to be calibrated once.Therefore,it is very necessary to develop a set of calibration device for dual mode atmospheric sounder.This paper focuses on the project of "dual mode atmospheric sounder’s calibration unit and its rotating mechanism",taking the stationary orbit microwave atmospheric sounder as the background,taking the dual mode atmospheric sounder calibration device as the research object,and combining the software of CATIA and workbench,and finally designs a set of device for the calibration of the dual mode atmospheric sounder.The device aims to gain accurate data of dual mode atmospheric sounder and achieves accurate monitoring and prediction of disastrous weather.The development of this device will provide a reference for the development of the calibration device version of dual mode sounder in the future.The research work of this paper is summarized as follows:(1)From the research background,The development status of the atmospheric sounder is summarized at home and abroad,it is narrated that the development process and working mode of the static orbit atmospheric sounder.Clarifying the main purpose of this study.(2)The imaging principle and calibration theory of microwave radiometer are studied and analyzed.The necessity,calibration method and calibration principle of the microwave radiometer are analyzed in detail.Based on the related theory,the whole structure of the double mode atmospheric sounder calibration device is designed,and the important parts of the device,the calibration unit,the rotating mechanism and the support frame are designed.(3)Based on the mechanics related theory,the statics analysis of the support frame is carried out.because it has a larger impact on the calibration.According to the analysis results,the shape optimization of the scheme is carried out.The analysis results show that the optimized results are compared with the former: the maximum stress is reduced by 95% and the maximum deformation is reduced by 93.9% when the device is horizontal.The maximum stress is reduced by 85% and the maximum deformation is reduced by 90.6% if the device is vertical.Clearly,it is necessary to optimize the device.(4)According to the relative index of rotating mechanism of dual-mode atmospheric sounder,a set of control plan that meets the requirement is designed.Starting from the control system of rotating mechanism,temperature control system and communication system,this paper analyzes how the parts of the system can meet the requirements of the system.At the same time,the selection of the related components,the writing of control program and the simulation of the program are also carried out.(5)The assembly process of the double mode atmospheric sounder calibration device is complex,and the engineering two-dimensional graph is difficult to express the details.Therefore,this paper makes detailed design of the assembly process from the virtual assembly.Since the dual mode atmospheric sounder calibration device requires high consistency of the required temperature sensor,and finally debug the whole device.The test results show that the dual mode atmospheric sounder calibration device meets the requirements of various technical indexes and meets the needs of the users.The research results of this paper have laid a certain technical foundation for the development of the model calibration device of dual mode atmospheric sounder in the future,and provide some reference for the development of the same kind of equipment. |
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