Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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Analysis of Tip/Tilt Compensation of Beam Wandering for Space Laser Communication

  • Seok-Min Song (Korea Astronomy and Space Science Institute) ;
  • Hyung-Chul Lim (Korea Astronomy and Space Science Institute) ;
  • Mansoo Choi (Korea Astronomy and Space Science Institute) ;
  • Yu Yi (Department of Astronomy and Space Science, Chungnam National University)
  • Received : 2023.10.06
  • Accepted : 2023.11.12
  • Published : 2023.12.15
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Abstract

Laser communication has been considered as a novel method for earth observation satellites with generation of high data volume. It offers faster data transmission speeds compared to conventional radio frequency (RF) communication due to the short wavelength and narrow beam divergence. However, laser beams are refracted due to atmospheric turbulence between the ground and the satellite. Refracted laser beams, upon reaching the receiver, result in angle-of-arrival (AoA) fluctuation, inducing image dancing and wavefront distortion. These phenomena hinder signal acquisition and lead to signal loss in the course of laser communication. So, precise alignment between the transmitter and receiver is essential to guarantee effective and reliable laser communication, which is achieved by pointing, acquisition, and tracking (PAT) system. In this study, we simulate the effectiveness of tip/tilt compensation for more efficient laser communication in the satellite-ground downlink. By compensating for low-order terms using tip/tilt mirror, we verify the alleviation of AoA fluctuations under both weak and strong atmospheric turbulence conditions. And the performance of tip/tilt correction is analyzed in terms of the AoA fluctuation and collected power on the detector.

Keywords

Acknowledgement

This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2022R1A2C1092602).

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