| China plans to launch a certain type of Mars probe for the first time in 2020 to complete the important mission of Mars exploration.If the mission is successful,China will become the second country in the world to independently master the technology of Mars landing inspection and exploration.The thermal control system of the detector is designed to ensure that the instruments and equipment inside and outside the detector work in normal temperature environment.The performance and reliability of the thermal control system of a detector directly determine the success of the development of the detector and the working life of the detector in outer space.Therefore,a lot of simulation tests are needed to verify the rationality and reliability of the overall functional structure of the thermal control system of Mars probe,so as to eliminate the unknown risk factors of the technical scheme in the design stage of the thermal control system of Mars probe,reduce the losses caused by the subsequent uncertainties,and provide effective experimental data and technology for the finalization of the thermal control system.Accumulation.In order to meet the above requirements,after a detailed analysis of the thermal control simulation requirements and control requirements of Mars probe,this paper fully understands the development of thermal control systems of foreign and domestic satellite detectors,and analyses the advantages and disadvantages of active thermal control and passive thermal control methods.On this basis,the overall design scheme of thermal control simulator for Mars rover is put forward according to the requirements of temperature telemetry simulation,heating load remote control simulation,satellite software control and related technical indicators.The hardware platform of thermal control simulator for Mars probe is composed of PC/104 industrial computer,temperature simulation module,heating load simulation module and power control module.Temperature analog module uses STM32 with AD5235/AD5174 digital potentiometer to simulate the temperature signals collected by 300 thermistors.450 digital potentiometers are set by SPI communication to meet the adjustable range of resistance values of 1k_~200k/1k~250k with setting accuracy of 0.1k.Heating load module uses STM32 with photoelectric encoder and thermal power resistor to achieve adjustable range of resistance values.The total heating power of 200 channels is simulated.Through the cooperation of the two modules,the precise control and condition monitoring of the thermal control simulator of Mars probe are realized.At the same time,the heating load algorithm is designed to meet the temperature requirements of each instrument working in different environments.Star control software is developed with C/C++,and the whole framework and functions of each module are realized with modular design idea.Temperature telemetry simulation and heating load simulation of the thermal control system of Mars probe are realized through hardware and software cooperation.A lot of experimental data are obtained through thermal control experiment,which provides data support for subsequent research and development.Finally,through several system debugging and thermal control simulation experiments,and the analysis of the experimental results,it shows that the thermal control simulator of Mars probe meets the requirements of hardware and software interface matching and various functional indicators.Among them,the temperature simulator can reach the adjustable range of resistance values of 1 k_~200 k/1 k~250 K with the setting accuracy of 0.1 k,and 200 thermal power resistors can be simulated according to the heating load algorithm.The pressure test condition is good,the system performance is complete,and the final delivery is completed through acceptance. |
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