Design of 2 GHz Bandwidth Digital Spectrometer in Hyperspectral Microwave Radiometer System

XU Hao-wen; LU Hao; WANG Zhen-zhan

doi:10.12263/DZXB.20201178

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Design of 2 GHz Bandwidth Digital Spectrometer in Hyperspectral Microwave Radiometer System

PAPERS | 更新时间：2025-12-08

- Design of 2 GHz Bandwidth Digital Spectrometer in Hyperspectral Microwave Radiometer System
- ACTA ELECTRONICA SINICA Vol. 50, Issue 6, Pages: 1472-1479(2022)
- 作者机构：
  
  1.中国科学院国家空间科学中心微波遥感技术重点实验室，北京 100190
  2.中国科学院大学，北京 100049
- 作者简介：
- 基金信息：
- DOI：10.12263/DZXB.20201178
  CLC： TP73;
- Received：22 October 2020，
  
  Revised：2021-03-23，
  
  Published：25 June 2022
- 稿件说明：
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许皓文,陆浩,王振占.高光谱微波辐射计系统中2GHz带宽数字谱仪设计[J].电子学报,2022,50(06):1472-1479.

XU Hao-wen,LU Hao,WANG Zhen-zhan.Design of 2 GHz Bandwidth Digital Spectrometer in Hyperspectral Microwave Radiometer System[J].ACTA ELECTRONICA SINICA,2022,50(06):1472-1479.
许皓文,陆浩,王振占.高光谱微波辐射计系统中2GHz带宽数字谱仪设计[J].电子学报,2022,50(06):1472-1479. DOI： 10.12263/DZXB.20201178.

XU Hao-wen,LU Hao,WANG Zhen-zhan.Design of 2 GHz Bandwidth Digital Spectrometer in Hyperspectral Microwave Radiometer System[J].ACTA ELECTRONICA SINICA,2022,50(06):1472-1479. DOI： 10.12263/DZXB.20201178.

摘要

高光谱微波辐射计是一种用于探测大气痕量气体的新型被动微波遥感器，数字谱仪是高光谱微波辐射计的核心部件.本文提出了一种新型宽带、实时数字谱仪的设计和实现方案，通过改进、结合快速傅里叶变换（Fast Fourier Transform，FFT）的并行处理和复数处理，形成了核心的基16实时复数FFT算法，最终得到信号的功率谱结果.数字谱仪采样率4.8 GHz，采用8 bit量化，输入3 dB带宽2 GHz，实现了1 024（1k）个频谱通道的结果.本文利用大气辐射传输模拟器（Atmospheric Radiative Transfer Simulator，ARTS）模拟了真实大气亮温谱并进行了仿真分析，随后通过输入的点频信号进行了测试，结果表明，核心算法子带亮温偏差最大值为0.02 K左右，核心算法子带灵敏度与理想子带灵敏度相比恶化程度低于20%，数字谱仪的有效位数（Effective Number Of Bits，ENOB）优于3 bit，信噪比（Signal to Noise Ratio，SNR）优于20 dB，谱分辨率恒定为2.3 MHz，可以有效满足辐射计中高层大气谱线探测的需求.

Abstract

Hyperspectral microwave radiometer is a new type of passive microwave remote sensor for detecting atmospheric trace gases

and the digital spectrometer is the core component of the hyperspectral microwave radiometer. In this paper

a new broadband

real-time digital spectrometer design and implementation scheme is proposed. The core radix 16 real-time complex fast Fourier transform(FFT) algorithm is formed by improving and combining the parallel processing and complex processing of FFT. Finally

the power spectrum of the signals can be obtained. The results for 1 024(1k) spectral channels are achieved by the digital spectrometer with the sampling rate of 4.8 GHz

the quantization bits of 8 bit

and the input 3 dB bandwidth of 2 GHz. The real atmospheric brightness temperature spectrum is simulated and analyzed by atmospheric radiative transfer simulator(ARTS)

and then the input point frequency signal is tested. The results show that the maximum value of sub-band brightness temperature bias caused by the core algorithm is about 0.02 K

and the core algorithm sub-band sensitivity deteriorates within 20% compared with the ideal sub-band sensitivity. The effective number of bits(ENOB) of the digital spectrometer 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

which can effectively meet the requirements of radiometers for spectral line detection in middle and upper atmosphere.

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references

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