Design of fast Fourier transform spectrometer in THz atmospheric limb sounder (TALIS) system

Haowen Xu; Hao Lu; Zhenzhan Wang; Wenyu Wang; Shuai Dong

doi:10.1117/12.2604347

24 November 2021 Design of fast Fourier transform spectrometer in THz atmospheric limb sounder (TALIS) system

Haowen Xu, Hao Lu, Zhenzhan Wang, Wenyu Wang, Shuai Dong

Proceedings Volume 12061, AOPC 2021: Infrared Device and Infrared Technology; 120610Q (2021) https://doi.org/10.1117/12.2604347
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

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.

Citation Download Citation

Haowen Xu, Hao Lu, Zhenzhan Wang, Wenyu Wang, and Shuai Dong "Design of fast Fourier transform spectrometer in THz atmospheric limb sounder (TALIS) system", Proc. SPIE 12061, AOPC 2021: Infrared Device and Infrared Technology, 120610Q (24 November 2021); https://doi.org/10.1117/12.2604347

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