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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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An Imaging System with Robust Spot Detection for Space Laser Communication ATP Systems.

Zhihong Liu1,2, Qiang Yan1,2, Zihao Li3

  • 1National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China.

Sensors (Basel, Switzerland)
|May 27, 2026
PubMed
Summary

This study presents an integrated hardware-software system for satellite laser communication acquisition, tracking, and pointing (ATP). The novel design enhances precision and reduces size, weight, and power (SWaP) for spaceborne applications.

Keywords:
ATPCMV4000image systemlaser communicationspot detection

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Area of Science:

  • Spacecraft engineering
  • Optical communication systems
  • Embedded systems design

Background:

  • Traditional multi-chip architectures face bandwidth and power limitations in inter-satellite laser communication ATP systems.
  • Thermal-induced timing misalignments challenge high-frame-rate image capture in spaceborne systems.

Purpose of the Study:

  • To develop a highly integrated hardware-software co-design imaging system for spaceborne ATP.
  • To overcome limitations of traditional architectures by optimizing Size, Weight, and Power (SWaP) metrics.

Main Methods:

  • Integration of a CMV4000 sensor and XCKU060 FPGA with a Loongson LA132 soft core.
  • Implementation of LVDS dynamic phase compensation and multi-stage synchronization for 180 fps error-free capture.
  • Application of a least-squares circle-fitting algorithm with nonlinear error compensation for spot distortion and noise mitigation.

Main Results:

  • Stable output of 2048 × 2048 resolution images.
  • Positioning Root Mean Square Error (RMSE) within 1.5 pixels under extreme conditions (5 dB SNR, 60% spot loss).
  • Demonstrated optimization of SWaP metrics.

Conclusions:

  • The proposed system offers a robust, high-precision solution for spaceborne ATP systems.
  • The integrated design effectively addresses bandwidth, power, and timing challenges.
  • The system achieves superior performance in adverse conditions, crucial for reliable satellite communication.