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State of the art resource covering key technologies and related theories of inter-satellite links.
Laser Inter-Satellite Links Technology explores satellite networking as a growing topic in the field of communication technology, introducing the definition, types, and working frequency bands of inter-satellite links, discussing the number of orbital elements of the spacecraft motion state under two-body motion and their conversion relationship, and establishing the basic demand model for inter-satellite link network, chain topology model, and transmission protocol model.
The book focuses on the analysis and introduction of the principles and error sources of microwave and laser inter-satellite ranging, including the basic composition, workflow, and constraints of the laser inter-satellite link, and related design principles of the inter-satellite laser transmitter and receivers. Later chapters also discuss theories and methods of acquisition, alignment, and tracking, the impact of alignment errors on performance, and inter-satellite link modulation and its implementation.
The International Telecommunication Union (ITU) has not yet allocated a laser band inter-satellite link, and the radio frequency link covers several radio frequency bands from ultra-high frequency (UHF) to extremely high frequency (EHF) allocated by the ITU. Compared with traditional inter-satellite radio frequency technology, satellite laser communication technology is known as a new generation of space communication technology. Laser carrier has some unique advantages: large communication capacity, good concealment performance, high bandwidth and transmission rate, strong anti-interference ability, no radio frequency license, etc., are required. At the same time, according to the modulation method and the detection method of the receiving end, the inter-satellite laser communication can be divided into incoherent – Intensity Modulation/Direct Detection (IM/DD) and coherent systems. The former uses light intensity modulation and direct detection schemes, which use precise modulation techniques (such as BPSK, QPSK, M-QAM, etc.) combined with coherent reception techniques (homodyne and heterodyne) schemes. Studies have shown that the IM/DD communication system cannot approach the theoretical limit of detection sensitivity in the actual inter-satellite link environment, and the sensitivity and wavelength selectivity of the coherent method are greatly improved compared to the IM/DD system.
Specific sample topics covered in Laser Inter-Satellite Links Technology include:
Pulse position modulation (PPM), differential pulse position modulation (DPPM), digital pulse interval modulation (DPIM), and double-head pulse interval modulation (DH-PIM)
Basic demand model of inter-satellite link network application, including basic configuration of constellations and inter-satellite transmission networks
Inter-satellite ranging accuracy, principles of microwave inter-satellite ranging, and analysis of microwave ranging error sources
Effect of tracking error on the beam distribution at the receiving end and influence of tracking and pointing error on communication error rate
Laser Inter-Satellite Links Technology serves a completely comprehensive resource on the subject and is a must-have reference for experts and scholars in aerospace, along with graduates and senior undergraduates in related programs of study