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A Spectrum Correction Algorithm Based on Beat Signal of FMCW Laser Ranging System.

Yi Hao1, Ping Song1, Xuanquan Wang1

  • 1Key Laboratory of Biomimetic Robots and Systems (Ministry of Education), Beijing Institute of Technology, Beijing 100081, China.

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PubMed
Summary
This summary is machine-generated.

A new algorithm, decomposition filtering-based dual-window correction (DFBDWC), significantly improves the accuracy of frequency modulated continuous wave (FMCW) laser ranging systems. This method effectively reduces errors caused by noise and spectrum issues in distance measurements.

Keywords:
FMCW laser rangingpicket fence effectsignal processingspectrum correctionspectrum leakagewhite Gaussian noise

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Area of Science:

  • Optoelectronics
  • Signal Processing
  • Metrology

Background:

  • Frequency Modulated Continuous Wave (FMCW) laser ranging systems are crucial for accurate distance measurements.
  • System accuracy is compromised by White Gaussian Noise (WGN), spectrum leakage, and the picket fence effect.
  • Existing spectrum correction algorithms offer unsatisfactory performance in mitigating these errors.

Purpose of the Study:

  • To introduce a novel algorithm, Decomposition Filtering-based Dual-Window Correction (DFBDWC), for enhancing FMCW laser ranging accuracy.
  • To address the limitations of traditional methods in correcting spectrum-related errors.
  • To demonstrate the superior performance of DFBDWC compared to existing algorithms.

Main Methods:

  • Development of the DFBDWC algorithm, incorporating decomposition filtering.
  • Utilizing a dual-window approach in the time domain.
  • Leveraging two phase values of the spectral peak in the frequency domain for correction.

Main Results:

  • DFBDWC significantly reduces the maximum absolute error in target distance calculations.
  • Error reduced from 0.7937 m (Discrete Fourier Transform algorithm) to 0.0407 m.
  • DFBDWC outperformed all compared traditional spectrum correction algorithms in simulations and experiments.

Conclusions:

  • The proposed DFBDWC algorithm offers a substantial improvement in FMCW laser ranging accuracy.
  • This algorithm effectively mitigates errors from WGN, spectrum leakage, and the picket fence effect.
  • DFBDWC enables the realization of high-performance FMCW laser ranging systems with broad application potential.