Phase error analysis and optimization for chirp transform spectrometer

doi:10.23919/JSEE.2025.000043

Journal of Systems Engineering and Electronics ›› 2025, Vol. 36 ›› Issue (3): 597-608.doi: 10.23919/JSEE.2025.000043

• ELECTRONICS TECHNOLOGY •

Phase error analysis and optimization for chirp transform spectrometer

Penglei RU¹^,²(), Mengwei LIU¹^,*(), Baifan HU¹^,²(), Wen WANG¹()

¹ Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
² University of Chinese Academy of Sciences, Beijing 100049, China

Received:2023-04-13 Online:2025-06-18 Published:2025-07-10
Contact: Mengwei LIU E-mail:rupenglei@mail.ioa.ac.cn;liumw@mail.ioa.ac.cn;hubaifan@mail.ioa.ac.cn;wangwenwq@mail.ioa.ac.cn
About author:
RU Penglei was born in 1997. He received his B.E. degree insignal and information processing from North University of China in 2019. He is currently a Ph.D. candidate in Institute of Acoustics (IOA), Chinese Academy of Sciences. His current research interests are high resolution spectroscopy, design and analysis of circuit systems and signal processing. E-mail: rupenglei@mail.ioa.ac.cn

LIU Mengwei was born in 1978. She received her B.S. and M.S. degrees in process equipment and control engineering from Dalian University of Technology in 1999 and 2002, and Ph.D. degree in microsystem engineering from Dalian University of Technology in 2006. From 2006 to 2009, she was a postdoctoral fellow with the Ultrasonics Laboratory in Institute of Acoustics, Chinese Academy of Sciences (CAS). She joined CAS in 2009 as associate professor. She is currently a professor with microacoustic signal processors and sensors group, Ultrasonics Laboratory in Institute of Acoustics. Her research interests focus on bulk acoustic wave (BW) and surface acoustic wave (SAW) signal processors and sensors, high resolution SAW chirp transform spectrometer (CTS) system for spectral line observation of radio astronomy and deep space exploration. E-mail: liumw@mail.ioa.ac.cn

HU Baifan was born in 1999. She received her B.S. degree in communication engineering from Zhengzhou University, China, in 2016. She is currently working toward her M.S. degree in signal and information processing with the University of Chinese Academy of Sciences, China. Her research interest is back-end data processing for chirp transform spectrometer system. E-mail: hubaifan@mail.ioa.ac.cn

WANG Wen was born in 1976. He received his M.S. degree insignal and information processing in Central South University in 2002, and Ph.D. degree insignal and information processing from the Institute of Acoustics (IOA), Chinese Academy of Sciences in 2005. From 2005 to 2009, he worked as a postdoctoral researcher and research professor at the microsystem laboratory of Ajou University in South Korea. In 2010, he worked in Freiburg University supported by the Humboldt Foundation as a gust professor. From 2011, he has been a distinguished professor at the IOA, Chinese Academy of Science, China. His current research involves surface acoustic wave (SAW) physical/Chemical sensor, and wireless SAW sensor. E-mail: wangwenwq@mail.ioa.ac.cn

Abstract

Abstract:

In the field of deep space exploration, the rapid development of terahertz spectrometer has put forward higher requirements to the back-end chirp transform spectrometer (CTS) system. In order to simultaneously meet the measurement requirements of wide bandwidth and high accuracy spectral lines, we built a CTS system with an analysis bandwidth of 1 GHz and a frequency resolution of 100 kHz around the surface acoustic wave (SAW) chirp filter with a bandwidth of 1 GHz. In this paper, the relationship between the CTS nonlinear phase error shift model and the basic measurement parameters is studied, and the effect of CTS phase mismatch on the pulse compression waveform is analyzed by simulation. And the expander error optimization method is proposed for the problem that the large nonlinear error of the expander leads to the unbalanced response of the CTS system and the serious distortion of the compressed pulse waveform under large bandwidth. It is verified through simulation and experiment that the method is effective for reducing the root mean square error (RMSE) of the phase of the expander from 18.75° to 6.65°, reducing the in-band standard deviation of the CTS frequency resolution index from 8.43 kHz to 4.72 kHz, solving the problem of serious distortion of the compressed pulse waveform, and improving the uneven CTS response under large bandwidth.

Key words: chirp transform spectrometer (CTS), microwave heterodyne spectroscopy, phase error compensation, surface acoustic wave (SAW), wide bandwidth

Penglei RU, Mengwei LIU, Baifan HU, Wen WANG. Phase error analysis and optimization for chirp transform spectrometer[J]. Journal of Systems Engineering and Electronics, 2025, 36(3): 597-608.

Figures/Tables 9

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Phase error analysis and optimization for chirp transform spectrometer

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