Design And Implementation Of Digital Radio Astronomy Observation Systems Receiving Terminal

In September1859, the sun released one of the strongest solar-storm on record. With the advent of the24th solar cycle, NASA (National Aeronautics and Space Administration) said in a statement,"2013sun will wake up from slumber. Solar storms may be like a flash of lightning, if not ahead of time to take preventive measures, the whole world will cause unpredictable consequences".The Ten meters solar radio telescope located in Phoenix Mountain Yunnan Observatory is important observation equipment in China solar radio physics. A decade ago,800-975MHz in the mobile phone operating band, it easy causes the receiver to saturation. So that, with fifty-four institute cooperation to establish this radio telescope, this band, which cannot be normal observation, has been abandon to observation. With the rational design of the RF front-end and digital terminal, the system supplemented the observations of this important band.The system down-conversion the800-975MHz signal, which is received by10m antenna, obtains the intermediate frequency (IF) signal. Then the signal through the high-speed AD acquisition card input to the FPGA. FPGA spectrum analysis of the signal sent to the remote PC by Gigabit Ethernet UDP. Finally, PC integrates, display and store those data.This paper firstly introduced the principles and method of the radio signals observation. By research related technologies, the paper raised the need to meet the technical specifications of the system. Secondly, this paper designed the overall system functions, which include analog down-conversion, AD sample, spectral analysis and display and store the data. The paper highlights the design and implementation of spectrum analysis portion, the power spectrum calculation and inter-clock domain design and the details of Gigabit Ethernet transmission. Then, the paper determines the correspondence between the output data and signal energy by a linear regression calibration method. Finally, the paper made a summary of the system design, and pointed out that the system needs to be improved and further research. The results of the analysis show that the system has a high real-time and reliability for the radio signals. It is capable of800-975MHz band observations.