Kalman filter spot centroid detection algorithm in optical wireless communication

Yang, Shangjun; Ke, Xizheng; Sun, Dengke; Liang, Jingyuan; Zhang, Yuhao

doi:10.1117/1.oe.61.5.056104

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…However, it's not suitable for in-orbit application as the complexity. Ref [22] combines the edge detection and Kalman filter (KF) to achieve a good robustness to turbulence, but the accuracy is relatively low compared to the classical algorithms when using in the ILC. Ref [23] combines the squared weighting centroid algorithm and the interpolation subdivision algorithm to improve the locating accuracy, but the noise robustness is still weak.…”

Section: Introductionmentioning

confidence: 99%

Accurate Real-Time Laser Spot Locating Based on Template Correlation in Intersatellite Laser Communications

Meng,

Liu,

Han

et al. 2024

IEEE Photonics J.

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In intersatellite laser communications, the centroiding accuracy of a laser spot is crucial for maintaining steady communication links. However, the systematic error introduced by discrete sampling restricts further improvement of centroiding accuracy when choosing algorithms that are widely used in engineering. Additionally, the ultrahigh computational complexity and multiple-step iterations of the Gaussian fitting (GF) algorithm are unsuitable for real-time implementation, even though the algorithm can achieve the highest centroiding accuracy. In this study, we propose a laser spot centroiding algorithm based on template correlation to simultaneously satisfy the requirements of real-time performance and accuracy. The proposed algorithm evaluates the central location of a laser spot by obtaining the index of the maximum Pearson correlation coefficient (PCC). Simulations performed under different conditions reveal that the proposed algorithm is robust against the interference of background noise and the bad pixels. Moreover, experimental verification is performed based on the implementation on a Field-Programmable Gate Array (FPGA) in real-time, meanwhile its accuracy is on the same level as that of the GF algorithm and better than those of other widely-used algorithms. Therefore, the proposed algorithm is suitable for accurate real-time locating of laser spots in engineering applications of the intersatellite laser communications.

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Section: Introductionmentioning

confidence: 99%

Accurate Real-Time Laser Spot Locating Based on Template Correlation in Intersatellite Laser Communications

Meng,

Liu,

Han

et al. 2024

IEEE Photonics J.

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Real-time uncertainty reduction in laser triangulation via dynamic speckle correlation

Cui,

Li,

Cong

et al. 2024

Measurement

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A robust and precise centroid positioning method for the weak beacon spot in long-distance inter-satellite optical wireless communications

Wang,

Cui,

Wang

et al. 2023

Opt. Express

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The centroid estimation of the beacon spot is crucial to the pointing, acquisition, and tracking subsystem in inter-satellite optical wireless communication (IsOWC), especially for the received very weak beacon caused by a long link distance. In this work, we propose an accurate centroid positioning method to calculate the centroid of such a weak beacon with a low peak signal-to-noise ratio. The proposed method is based on the idea that uses the normalized amplitude of the gray gradient to enhance the weights near the center of the beacon spot. Both comparative numerical simulation and experimental verification are implemented, which demonstrate the effectiveness and feasibility of the proposed method. Compared to the gray centroid method, interpolation-based method, Hough transform method, and Gaussian fitting method, the proposed method has stronger robustness and higher accuracy, which could be helpful to applications in IsOWC as well as beacon-based pointing and tracking systems.

show abstract

Kalman filter spot centroid detection algorithm in optical wireless communication

Cited by 4 publications

References 31 publications

Accurate Real-Time Laser Spot Locating Based on Template Correlation in Intersatellite Laser Communications

Accurate Real-Time Laser Spot Locating Based on Template Correlation in Intersatellite Laser Communications

Real-time uncertainty reduction in laser triangulation via dynamic speckle correlation

A robust and precise centroid positioning method for the weak beacon spot in long-distance inter-satellite optical wireless communications

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