Research And Implementation Of High-Resolution Solar Radio Receiving Data Processing And Storage Method

The input of the sun's material and energy to the earth directly determines the maintenance and change of the Earth and its surrounding space environment.Eruptions such as solar flares and coronal mass ejections are the most violent explosions in the solar system.The released energy and high-energy particles will cause severe disturbances to the entire interplanetary space environment,thus affecting the safety of space weather and near-Earth space.The observation of solar radio burst plays a vital role in the study of solar physics and space weather environment monitoring,and has important value in space physics research.With the continuous development of radio signal observation technology,high precision solar radio observation system has become the goal pursued by solar radio observation stations around the world.High temporal resolution and high frequency resolution of solar radio data facilitates fine and accurate measurement of solar radio burst drive shocks,high energy electron energy,shock waves and electron arrival times,and provides more reliable basis for solar physics research and space weather monitoring.With the use of high-precision astronomical observation equipment,astronomical observation data is growing at a rate of terabytes,which poses a huge challenge for the storage and analysis of astronomical observation data.This thesis analyzes the existing observing system of the Chashan Solar Radio Observatory in Rongcheng.Shandong.The observing system uses a parabolic antenna with a diameter of 6 meters and the observation frequency band is 150-500 MHz.The high-speed AD acquisition card and FPGA are used to process the solar radio observation system.The system can realize high-resolution data acquisition and processing with a time resolution of up to 1 ms and a daily collection of 4.5 TB.In the daily observation process,there are very few solar burst events that you want to observe.most of the data is the solar quiet data,there is not much change,and high-resolution observation is not needed.Therefore,the efficiency of data collection becomes very low,and the massive amount of data makes data storage and how to judge whether it contains valid information becomes a problem.The traditional hard disk can't meet the data volume of terabytes,and data storage is the need of long-term observation.It is not a long-term solution to increase storage space,there is an urgent need for more effective processing methods to solve existing problems.Based on the practical problems faced by the project,this thesis carefully analyzes the system design requirements,proposes a new system solution based on the infrastructure of the observatory,and designs and implements it.The data processing system is added after the above-mentioned acquisition system,the collected high-resolution data is uploaded to the computer,and then the data file is read for real-time burst judgment processing.If the data file contains a burst event,the file is directly saved.If the burst event is not included,the data frame in the file is accumulated and averaged to reduce the number of data frames,thereby reducing the data time resolution and reducing the amount of solar quiet data storage.The burst judgment process in the system must avoid the influence of signal interference on accuracy and meet the real-time processing requirements of the system.In this thesis,the burst judgment scheme has been optimized several times,which can not only meet the needs of fine observation of solar radio bursts,but also effectively reduce the amount of data of solar quiet radio signals.The data file is subjected to lossless compression processing after the burst judgment processing process,thereby further reducing the amount of all data storage.In this thesis,the commonly used lossless compression algorithm is tested,and finally the LZ4 algorithm with the fastest processing speed is selected and modified.The compression ratio is improved on the basis of satisfying the real-time processing speed of the system.In this thesis,the software interface design of the data processing system is convenient for the observer to operate and realize the automatic operation.The software provides some data analysis and processing functions.Finally,through detailed testing,the stability and feasibility of the system are verified,and the problems faced by the project are effectively solved.