THz Atmospheric Limb Sounder (TALIS) is a microwave radiometer designed by the National Space Science Center (NSSC) of the Chinese Academy of Sciences (CAS) for sounding the vertical distribution of the atmosphere, focusing on measuring the temperature and the chemical composition of the middle and upper atmosphere. Fast Fourier transform spectrometer (FFTS) is the core component of TALIS back-end, which mainly undertakes the function of spectral analysis. In this paper, a new wideband, real-time FFTS design and implementation scheme is proposed to obtain the power spectrum of the signal through the core radix 16 real-time complex FFT algorithm. The analysis bandwidth and the number of channels of FFTS are 2 GHz and 1 k, respectively. The simulations and tests are performed using sinusoidal signals, and the results show that the effective number of bits (ENOB) is better than 3-bit, the signal-to-noise ratio (SNR) is better than 20 dB, and the spectral resolution is constant at 2.3 MHz. Moreover, the peak frequencies of the simulation and test are consistent, which can meet the requirements of the spectral line detection in TALIS.
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