[A-CG41] Satellite Earth Environment Observation

[ACG41-P14] A 10-GHz Wideband Digital Spectrometer for Atmospheric Hyperspectral Microwave Sounding

*Wenyu Wang¹, Hao Lu¹, Jingyi Liu¹, Zhenzhan Wang¹ (1.National Space Science Center, Chinese Academy of Sciences)

Keywords:microwave radiometer, hyperspectral, spectrometer, atmosphere

Hyperspectral microwave radiometer is a new type of passive microwave remote sensor for observing atmospheric temperature, humidity and other parameters such as trace gas. The digital spectrometer, which allows the fine sampling of the spectral lines, is the core component of the radiometer. We propose the design and implementation of a wideband, real-time channelized digital spectrometer, which realizes the core base-64 real-time complex fast Fourier transform (FFT) algorithm and channelization algorithm by improving the filter bank, 128-channel parallel processing of FFT and complex number processing. The digital spectrometer has a sampling rate of 20 Gsps, a quantization bit number of 8 bits, and an input bandwidth of 10 GHz, which realizes the spectrum analysis of 4096 channels. An observation test was carried out using a V-band ground-based microwave radiometer equipped with this 10-GHz spectrometer.