Doppler Frequency Spectral Discrimination of Moving Target Based on Coherent Detection

Shu-ping, 彭树萍 Peng; Tao, 陈涛 Chen; Hong-jun, 于洪君 Yu; Shuai, 赵帅 Zhao; Heyong, 张合勇 Zhang

doi:10.3788/cjl201340.1208008

Cited by 4 publications

(2 citation statements)

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“…Laser coherence detection has the advantages of high sensitivity, high measurement accuracy, high directivity, strong anti-interference ability and so on. It is widely used in target detection, synthetic aperture imaging, velocity measurement and other fields [1][2][3][4]. With the continuous progress of technology, the target speed is faster and the Doppler frequency is larger, and the requirements for photoelectric conversion and data processing are higher.…”

Section: Introductionmentioning

confidence: 99%

The influence of light source linewidth on power spectrum of four light coherent mixing signal

Ren¹,

Zhang²,

Zhang

et al. 2023

SPIE-CLP Conference on Advanced Photonics 2022

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The four-optical coherent mixing detection technology can improve the dynamic range of moving target detection. This method has the difficulty of distinguishing the type of mixing output signal. We propose a method to distinguish the signal type by using the different peaks of the mixed signal spectrum. Based on the statistical theory, the power spectrum function of the mixed signal is obtained, and the numerical analysis of the influence of the light source line width and the light source frequency difference on the signal power spectrum is carried out. Through numerical calculation and analysis, the results show that the increase of the light source linewidth will lead to the broadening of the signal power spectrum. When the Doppler frequency difference is greater than 1/5 times the linewidth of the light source, the power spectrum of the two homodyne coherent signals in the four-light coherent mixing can be distinguished; when the Doppler frequency difference is less than 1/5 times the light source linewidth , The power spectrum of the two homodyne coherent signals in four-optical coherent mixing can not be distinguished.

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Section: Introductionmentioning

confidence: 99%

The influence of light source linewidth on power spectrum of four light coherent mixing signal

Ren¹,

Zhang²,

Zhang

et al. 2023

SPIE-CLP Conference on Advanced Photonics 2022

View full text Add to dashboard Cite

show abstract

“…Compared to direct detection technology, laser coherent detection technology greatly improves the signal-to-noise ratio and detection sensitivity. At the same time, it has the advantage of a strong anti-interference ability, and is widely used in target detection [1], synthetic aperture imaging [2], Doppler measurement [3,4], and other fields. With the development of technology and changes in demand, single-frequency laser coherent detection cannot meet the measurement requirements of higher precision and higher speed.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Light Source Line Width on the Spectrum Resolution of Dual-Frequency Coherent Detection Signals

Ren

Sun

Zhang

et al. 2019

Sensors

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In this paper, the power spectrum resolution problem of dual-frequency coherent mixing signals is analyzed when the Doppler frequency difference is small. The power spectrum function formula of the four optical coherent mixing signals is obtained using statistical theory and the Wiener–Khinchin theorem. The influence of delay time and light source line width on the power spectrum of dual-frequency coherent signals is analyzed using this formula. The results show that delay time only affects the peak of the power spectrum of the coherent signal. An increase in the line width of the light source broadens the signal power spectrum and reduces the peak value. The necessary condition for distinguishing the Doppler frequency difference is that the theoretical Doppler frequency difference is greater than 1/5 times the line width of the light source.

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Receiving characteristics analysis of large dynamic range based on four-optic coherent mixing

Ren

Sun

Zhang

et al. 2020

Optik

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Doppler Frequency Spectral Discrimination of Moving Target Based on Coherent Detection

Cited by 4 publications

References 0 publications

The influence of light source linewidth on power spectrum of four light coherent mixing signal

The influence of light source linewidth on power spectrum of four light coherent mixing signal

The Effect of Light Source Line Width on the Spectrum Resolution of Dual-Frequency Coherent Detection Signals

Receiving characteristics analysis of large dynamic range based on four-optic coherent mixing

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