Beat-Notes Acquisition of Laser Heterodyne Interference Signal for Space Gravitational Wave Detection

doi:10.3390/s23063124

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	Beat-Notes Acquisition of Laser Heterodyne Interference Signal for Space Gravitational Wave Detection
	Z. Wang, T. Yu, Y. Sui and Z. Wang
	2023
发表期刊	Sensors
ISSN	14248220
卷号	23 期号:6
摘要	In space gravitational wave detection missions, the laser heterodyne interference signal (LHI signal) has a high-dynamic characteristic due to the Doppler shift. Therefore, the three beat-notes frequencies of the LHI signal are changeable and unknown. This may further lead to the unlocking of the digital phase-locked loop (DPLL). Traditionally, fast Fourier transform (FFT) has been used as a method for frequency estimation. However, the estimation accuracy cannot meet the requirement of space missions because of the limited spectrum resolution. In order to improve the multi-frequency estimation accuracy, a method based on center of gravity (COG) is proposed. The method improves the estimation accuracy by using the amplitude of the peak points and the neighboring points of the discrete spectrum. For different windows that may be used for signal sampling, a general expression for multi-frequency correction of the windowed signal is derived. Meanwhile, a method based on error integration to reduce the acquisition error is proposed, which solves the problem of acquisition accuracy degradation caused by communication codes. The experimental results show that the multi-frequency acquisition method is able to accurately acquire the three beat-notes of the LHI signal and meet the requirement of space missions. © 2023 by the authors.
DOI	10.3390/s23063124
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收录类别	sci ; ei
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/68005
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Z. Wang, T. Yu, Y. Sui and Z. Wang. Beat-Notes Acquisition of Laser Heterodyne Interference Signal for Space Gravitational Wave Detection[J]. Sensors,2023,23(6).
APA	Z. Wang, T. Yu, Y. Sui and Z. Wang.(2023).Beat-Notes Acquisition of Laser Heterodyne Interference Signal for Space Gravitational Wave Detection.Sensors,23(6).
MLA	Z. Wang, T. Yu, Y. Sui and Z. Wang."Beat-Notes Acquisition of Laser Heterodyne Interference Signal for Space Gravitational Wave Detection".Sensors 23.6(2023).

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