Millimeter-Wave and Submillimeter-Wave FFT Digital Spectrum Radiometer

The FFT digital spectrum radiometer is a detector that receives and finely analyzes the broadband spectrum of the atmosphere and is capable of precisely detecting the vertical temperature distribution of the atmosphere, which has a broad application prospect in satellite meteorological remote sensing. In this paper, a method for designing and implementing a two-dimensional FFT digital spectral radiometer based on complex conjugate optimized is presented. The working principle, composition, and functions of the system are provided. Finally, the experiment result shows the FFT digital spectrum has the abilities of receiving signal band up to 4.8GHz, real-time processing of 32768 data and dividing Spectrum from 10 to 200 MHz, which satisfies the radiometer system's needs for a digital spectrometer in terms of high-speed operation, high-precision quantization, and adaptability."