Research Status and Development Trend of High Earth Orbit Satellite Laser Relay Links

Ruofan, 张若凡 Zhang; Wenrui, 张文睿 Zhang; Xuejiao, 张学娇 Zhang; Jinlong, 张锦龙 Zhang; Chengzhi, 姜承志 Jiang; Xiaocheng, 朱晓程 Zhu; Lei, 裘磊 Qiu; Bo, 汪波 Wang; Weijun, 陈伟军 Chen

doi:10.3788/lop202158.0500001

Cited by 6 publications

(2 citation statements)

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Section: Introductionmentioning

confidence: 99%

“…Starting from the successful satellite laser communication test, its research depth, test range, communication rate, etc. continue to improve, and with the social demand for real-time communication, towards commercialization, but also the future of large-scale constellation networking of choice [3][4].The inter-satellite laser chain building mainly relies on three steps of capture, tracking and targeting, which is comprehensively called PAT (Pointing Acquiring Tracking) system [5].The PAT system is a composite control system structure, which contains three main parts, namely, targeting…”

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Study of the broken chain diagnosis method based on space laser communication

Liu,

BIAN,

ZHANG

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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Space laser communication has the advantages of fast transmission rate, strong anti-interference ability and high confidentiality, and is the future development trend of high-speed data transmission in space. The laser beam dispersion angle is small, and the field of view of space environment reception is limited, so it is necessary to track the beam stably in order to realize high-speed data communication. However, due to the influence of certain environmental factors or internal factors of the terminal, the tracking process will inevitably break the chain, which can not ensure stable data communication. Acquisition and tracking is a fast servo control system. It is difficult to diagnose the cause of chain breakage by viewing the telemetry on the bus to capture the state at the moment of chain breakage after the chain is built by on-rail laser communication. Aiming at this problem, this paper proposes a diagnostic method of broken chain for space laser communication, so that the relevant data can be locked at the moment of broken chain after the satellite enters the orbit and the data can be transmitted back to the ground. Then the professionals can analyze the cause of the broken chain and find the corresponding solutions to modify it in the orbit. IntroductionSpace laser communication is a kind of communication method that utilizes laser beams as carriers to transmit data information such as images, voice and signals in space [1]. Compared with traditional microwave communication, space laser communication has the advantages of fast transmission rate, large communication capacity, strong anti-electromagnetic interference performance, high confidentiality and small size of the communication terminal, low power consumption and good practicality, which can realize faster and higher volume of data transmission [2]. Satellite laser communication spectrum belongs to the invisible light band, and its beam is narrower than microwave, with smaller divergence angle and good directivity, which makes the communication obtain good anti-jamming ability and anti-interception ability, and provides higher security and reliability. In addition, inter-satellite laser communication has a high degree of energy concentration, and when a high link communication rate is required, the advantages of laser communication terminal in terms of volume, quality and power consumption can be reflected, which is also in line with the requirements of today's satellite platform for the payload. Starting from the successful satellite laser communication test, its research depth, test range, communication rate, etc. continue to improve, and with the social demand for real-time communication, towards commercialization, but also the future of large-scale constellation networking of choice [3][4].The inter-satellite laser chain building mainly relies on three steps of capture, tracking and targeting, which is comprehensively called PAT (Pointing Acquiring Tracking) system [5].The PAT system is a composite control system structure, which contains three...

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Study of the broken chain diagnosis method based on space laser communication

Liu,

BIAN,

ZHANG

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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Design and analysis of an ultra-wide-angle laser communication optical system

Hu,

An,

et al. 2024

Appl. Opt.

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With the development of information networks and laser communication technology, the coverage communication form of inter-satellite networks has become crucial. In order to solve the problems of a small communication field of view and difficult integration, an optical system design method for network laser communication is proposed. Based on the ultra-wide-angle system, the non-similar imaging principle is used to realize the design of a large field of view omnidirectional optical antenna, and the communication link of the antenna is analyzed accordingly. The results show that the communication field of view of the antenna can reach 130°, and the beam divergence angle increases from 420 to 2000 µrad in this range, which can realize long-distance laser communication with a communication rate of 5 Gbps. The design method proposed in this paper provides a new design idea for the development of a laser communication optical antenna, which has great application potential in the field of inter-satellite laser communication networking.

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Nodular-defect induced degradation of laser damage resistance of 532 nm high reflectivity coating after exposure to gamma rays

Peng,

Xia,

Xia

et al. 2024

Opt. Express

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The coupling effect of gamma-ray radiation and 532 nm nanosecond laser radiation on optical coatings and substrates was investigated. Fused silica and S-BSL7 glass with 532 nm high reflectivity (HR) coatings were irradiated using 60Co gamma-ray source at a dose rate of 1 Gy/s for a total dose of 1–500 kGy. After irradiation, the samples were subjected to raster scan testing using a laser with a pulse width of approximately 8.6 nanosecond and wavelength of 532 nm to measure their laser-induced damage threshold (LIDT). The results showed that S-BSL7 glass was significantly darkened after gamma-ray irradiation, whereas fused silica did not change color, but E’ color centers appeared at a dose of 500 kGy. All the coated samples maintained a high level of reflectivity. No significant changes are observed in the material structures of the samples. However, the LIDT of the high reflectivity film decreased significantly after 500 kGy irradiation, whereas the LIDT of all other samples showed no obvious degradation. Scanning electron microscopy of the damage pit cross-sections revealed that all the damage was initiated by nodular defects, suggesting that gamma rays affected the nodular structure. We used Monte Carlo simulations to compare the energy deposition and electron excitation conditions of the film with a nodular structure and an intact multilayer structure under gamma-ray irradiation. We found that the nodular structure slightly enhanced the effect of gamma rays on the film. Considering the small size of the nodules, this small enhancement was only apparent under high-dose gamma-ray irradiation. In general, we confirmed that gamma-ray irradiation influenced the LIDT of the 532 nm HR coating through nodular defects other than the coating stack.

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Research Status and Development Trend of High Earth Orbit Satellite Laser Relay Links

Cited by 6 publications

References 0 publications

Study of the broken chain diagnosis method based on space laser communication

Study of the broken chain diagnosis method based on space laser communication

Design and analysis of an ultra-wide-angle laser communication optical system

Nodular-defect induced degradation of laser damage resistance of 532 nm high reflectivity coating after exposure to gamma rays

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