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Related Experiment Video

Updated: Dec 6, 2025

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TRC-Based High-Precision Spot Position Detection in Inter-Satellite Laser Communication.

Qing Li1,2,3,4, Hongyang Guo1,3,4, Shaoxiong Xu1,3,4

  • 1Institute of Optics and Electronics, Chinese Academy of Sciences, No.1 Guangdian Road, Chengdu 610209, China.

Sensors (Basel, Switzerland)
|October 7, 2020
PubMed
Summary

This study introduces a novel method for precise spot position detection in inter-satellite laser communication (Is-OWC) terminals with weak signals. The technique enhances signal detection under extremely low signal-to-noise ratios (SNR) for improved space optical communication.

Keywords:
four-quadrant detectorinter-satellite laser communication systemtime reversal convolutionweak light-spot position detection

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Area of Science:

  • Space optical communication and inter-satellite laser communication (Is-OWC) technologies.
  • Signal processing for low signal-to-noise ratio (SNR) environments.

Background:

  • Emerging Is-OWC terminals lack independent beacon lights, relying on narrow communication beams for acquisition, tracking, and aiming (ATP).
  • This reduces beam energy for ATP systems, posing challenges for high-precision spot position detection under extremely low SNR.

Discussion:

  • A novel method modulates signal light intensity with a cosine signal, converting weak light signal detection into line spectrum signal detection.
  • The time reversal convolution (TRC) algorithm, combined with a window function, is employed to suppress noise and enhance spectrum lines.
  • Accurate detection of weak photocurrent amplitudes is achieved, enabling precise spot position determination through photocurrent amplitude ratios.

Key Insights:

  • The proposed method successfully detects spot positions even at an output SNR of -17.86 dB for the four-quadrant detector (QD).
  • The absolute error in spot position detection is maintained within 0.0238 mrad.
  • This technique offers a robust solution for high-precision detection in challenging low-SNR Is-OWC scenarios.

Outlook:

  • Potential for enhancing the reliability and performance of Is-OWC systems, particularly those with limited beacon capabilities.
  • Further research could explore optimizations of the modulation and TRC algorithm for even greater SNR improvements.
  • This approach may find applications in other free-space optical communication systems requiring precise alignment under adverse conditions.