The Design And Implementation Of The Solar Radio Receiver

The phenomenon that radiation intensity of radio wavebands increasing suddenly when the solar burst, is called solar radio storm. Powerful solar radio storm can affect the state of the ionosphere, communication, navigation and so on.Not only can studying the solar radio storm understand and diagnose the physical process of related and basic plasma, but also know important information in the process of explosion like energy release with transformation mechanism, mass movement and so on. So, effective observation and long time monitoring of radio bursts and their fine structures have important scientific research value and can help to better carry out space weather service. Solar radio receiver is an important tool for receiving and studying the information of solar radio storm,which can provide data accumulation and monitoring for radio basic research. At home and abroad, the receiver is relatively less, and the design and implementation of the solar radio receiver are carried out in combination with the actual needs of the project team and the less receiver for solar radio observations demand at home and abroad.Combined with the current advanced semiconductor products,the paper adoptes the scheme of high speed data acquisition and high performance computer through the research of many literatures and spectrum analyzer of existing observation station.The scheme is all digital design, with the characteristics of small size, high integration, programmable and so on. The solar radio receiver system designed in this paper is mainly composed of high speed data acquisition card, high performance computer and high performance GPS synchronous clock. The high speed data acquisition card is responsible for the collection of data and preprocessing, and then upload those data to the computer through the PCIe. The high performance computer is mainly for data storage and spectrum analysis, and then show the display of the spectrum map, intensity map and other forms. For follow-up researchers to view the data and research easily, the high performance GPS synchronous clock is used with the relative time stamp designed by FPGA, to record the absolute time of the packet.According to the requirement of the project team to study the fine structure of the solar radio in the 150M-480MHz section, the paper designs a solar radio receiver. The main works of this paper are shown as follows:The function of "power threshold judge upload" is designed and implemented in the FPGA.If the power sum is greater than the thresholdwhich means that the solar brusts, data is uploaded every Tms. If the power sum is not greater than the threshold which means that the solar do not brust, data is uploaded every Tmin. The relative time stamp is also designed and implemented to cooperate with the GPS synchronous clock to get the absolute time stamp which can record the time of the data. At the same time,the chaining PCIe-DMA which can save some of configuration time is designed based on the manufacturer of PCIe-DMA in this paper to improve the speed of PCIe-DMA further; Data receiving and storage program and spectrum analysis program are designed and implemented in this paper. In the VS2012 platform, the data receiving and storage program is wrote and realized to observe it. The spectrum analysis program can work it by using the powerful data processing ability and visual ability of Matlab. At the same time, the GUI control is used to compile the display interface, which can display the spectrum map, intensity map and three-dimensional map; By using the existing conditions, the debugging work of the receiver is completed and gets the good test results in the laboratory environment. The receiver can realize solar radio observation with the time resolution 10ms, the frequency resolution 32KHz. The design scheme of this paper can meet the requirements of the project team at the present stage through debugging and testing.