Real-time Digital FFT Spectrometer for Delingha 13.7 m Telescope

In radio astronomy, as the spectrum analysis equipment at the back end of the receiver, the spectrometer is very different from the commercial general spectrum analyzer. After several generations of development, the radio astronomy spectrometer has developed into a real-time digital spectrometer based on chips such as Analog-to-Digital Converter (ADC) and Field Programmable Gate Array (FPGA). Real time digital spectrometer has the advantages of wide bandwidth, high frequency resolution, high dynamic range and long-time stability, etc., and more importantly, it has the characteristics of small volume and loose environmental requirements. There are 18 real-time digital Fast Fourier Transform (FFT) spectrometers at the back end of receivers for Delingha 13.7 m telescope. The performance and maintenance of real-time digital FFT spectrometers for 13.7 m telescope are introduced. The performance and maintenance of the real-time digital FFT spectrometers for 13.7 m telescope are introduced. These can provide experience reference for the maintenance of other long time running real-time digital FFT spectrometers, and provide partial improvement direction for the development of the next generation of real-time digital FFT spectrometers.