| LAMOST,also known as "Guo Shoujing Telescope",is an active reflective Schmidt telescope.In order to observe 4000 celestial bodies at the same time,it needs to control 4000 optical fiber units.The entire wireless controller system has been in normal operation since the installation was completed.In 2012,the core chips MC13213,MC13192,MC9S12 of the current LAMOST wireless system were products launched by Freescale in 2004.Due to company reorganization and other reasons,the product was discontinued in 2018.Considering the operation and maintenance of LAMOST,new controls need to be designed.The system is required to be compatible with the existing system to meet the requirements of operation and maintenance and gradually replace the existing system.During 12 years of operation and maintenance,it was found that the existing system still has areas that need improvement:1.In terms of static power consumption of the sub-node driver board,the heat generated by the 4000 driver boards will lead to the deterioration of the observed environmental conditions and the reduction of on-site safety performance,which still needs to be improved.2.In terms of wireless communication,the signal quality of communication is insufficient and needs to be improved.3.The inquiries are sent one by one,and the efficiency of the communication method is low.It will be difficult to meet the real-time requirements when the control system is changed to a closed loop in the future.4.The communication data does not have a time network,and it is difficult and easy to confuse the running data to query.In view of the above problems,this article designed a set of wireless controller system based on CC2530.The controller system and the existing controller system can run in parallel,and have all the functions of the original controller system.The controller in this paper is mainly designed from the following aspects:1.Compatibility design with the original system.The host computer and the main node control board of this system adopt CAN and serial communication design.The main node control board and sub-node drive board adopt zigbee wireless design,and the channel design is different from the original control system.2.The power module of the sub-node driver board is redesigned with a switching power supply,which reduces the static power consumption of the sub-node driver board;the radio frequency part adopts key technologies such as single-ended line,differential line impedance matching,and capacitor resistance fine-tuning impedance,which reduces The signal loss and reflection greatly improve the wireless communication quality of the sub-node control board.3.The master node control board adopts the design of STM32+radio frequency control CC2530+power amplifier RXF2401C,which improves the quality of the wireless signal sent by the master node and the sensitivity of reception.4.In terms of software,the characteristics of LAMOST control are studied,and the control is carried out by group sending and polling one by one.The use of parity check improves the communication reliability of the system and reduces the communication time;and the entire control data A time stamp is designed to provide reliable data for the analysis of the entire system data.Compared with the original control system,the performance of the wireless controller system designed in this paper has the following improvements:first,the static power consumption of the sub-node driver board is reduced by about 33%;second,the wireless controller of the sub-node driver board and the main node control board The signal strength is greatly improved;third,the experimental data in the experiment is more reliable and the communication efficiency is higher. |
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