Research On Data Acquisition System Of Low Frequency Radio Antenna Array

Many different objects in the universe are able to emit radio waves,such as the sun,moon and star.In astronomy,these radio waves emitted by objects called radio waves,referred to as the radio.At present the human understanding and research of various celestial bodies in the universe are basically the radio to achieve.Shot the radio frequency in 10-250MHz is called the low-frequency radio waves.The research and collection of this band radio information is of great significance to study the sun and other planets of the radio bursts.The Information Institute of Yunnan University has started research in this area,and has set up four sets of low frequency radio antenna for testing,but also the lack of a low frequency radio antenna array signal acquisition system.This project is to design the low frequency radio antenna array data acquisition system.The first design is composed of low frequency antenna array low frequency astronomical signal from the outside and the copper shaft cable analog signals from the received astronomical analog-to-digital conversion FMC150A/D sampling card,FMC150A/D sampling card to achieve the simulation of astronomical received signal is converted into digital signal and transmitted to the FPGA in real time The integration of processing on the card,and then through the host computer to achieve FPGA card integration of the processed data by using the UDP protocol through the Gigabit Ethemet transmitted to the host computer.The host computer part and reducing process of received data spectrum transformation,and finally through the PC machine interface display graphics we need and time domain frequency domain graph.This paper first introduces the research background of this project,the research objectives and the problems need to be solved,and then introduces the basic theory of low frequency radio antenna array signal acquisition system is involved,then the whole scheme of low frequency radio antenna array signal acquisition system is divided into various modules briefly,and then through the software design of each module the realization of a detailed explanation,and finally through the system debug and field engineering tests verify the feasibility and correctness of the design.The ADC module,FPGA data processing and software design and PC data processing and the realization of software were introduced.Gigabit Ethernet to UDP data transmission to the host computer;the host computer data processing section receives a Gigabit Ethernet transmission over.And the data integration process,to restore the original form,and the spectrum of the transformation of these data and then display and storage in the PC interface.The results show that the data acquisition system designed in this paper can be used to collect,analyze,store and display the data in low frequency band.