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Snr-based beaconless multi-scan link acquisition model with vibration for LEO-to-ground laser communication

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Abstract

We propose a link acquisition time model deeply involving the process from the transmitted power to received signal-to-noise ratio (SNR) for LEO-to-ground laser communication for the first time. Compared with the conventional acquisition models founded on geometry analysis with divergence angle threshold, utilizing SNR as the decision criterion is more appropriate for practical engineering requirements. Specially, under the combined effects of platform vibration and turbulence, we decouple the parameters of beam divergence angle, spiral pitch, and coverage factor at a fixed transmitted power for a given average received SNR threshold. Then the single-scan acquisition probability is obtained by integrating the field of uncertainty (FOU), probability distribution of coverage factor, and receiver field angle. Consequently, the closed-form analytical expression of acquisition time expectation adopting multi-scan, which ensures acquisition success, with essential reset time between single-scan is derived. The optimizations concerning the beam divergence angle, spiral pitch, and FOU are presented. Moreover, the influence of platform vibration is investigated. All the analytical derivations are confirmed by Monte Carlo simulations. Notably, we provide a theoretical method for designing the minimum divergence angle modulated by the laser, which not only improves the acquisition performance within a certain vibration range, but also achieves a good trade-off with the system complexity.

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Data availability

Data sets generated during the current study are available from the corresponding author on reasonable request.

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Authors and Affiliations

  1. School of Astronautics and Aeronautics, University of Electronic Science and Technology of China, Xiyuan Avenue, Chengdu, 611731, Sichuan, China

    Sen Yang & Xiaofeng Li

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  1. Sen Yang
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  2. Xiaofeng Li
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Contributions

SY carried out the derivations, performed the simulations, and wrote the main manuscript. XL supervised the project. All authors reviewed the manuscript.

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Correspondence to Xiaofeng Li.

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Yang, S., Li, X. Snr-based beaconless multi-scan link acquisition model with vibration for LEO-to-ground laser communication. Appl. Phys. B 130, 77 (2024). https://doi.org/10.1007/s00340-024-08213-0

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