Application of high-speed space laser communication system in aerospace information network

Aiming at the main problems faced in the application of high-speed space laser communication system: tracking and targeting of high-speed movement of nodes and working in coordination with networking loads, a dual communication load structure with high-speed space laser communication system as the main communication load of nodes is proposed, and high-speed space is designed. The cooperative working mechanism and protocol model of the laser communication system and the networked load were developed and tested on the principle prototype based on the protocol model. The experimental results show that the proposed cooperative working mechanism and protocol model can be well applied to high-speed space laser systems, supporting ultra-high-rate data transmission, and the higher MAC layer protocol data rate can reach 1.772Gb/s, and the average processing delay is 20u0026mu; s. At present, space-based and space-based man-made aircraft such as earth orbiting satellites (GEO), low-orbiting satellites (LEO) space shuttles, high-altitude airships, etc., mainly use high-speed or low-speed microwave links to communicate with corresponding ground stations to form a chimney.u0026rdquo; Or through the ground network for data connection and information sharing to form the Tianxing Earth Networku0026rdquo; application form. In some applications, although some satellites can provide data relay services for other space-based aircraft, this data relay service cannot be called a space network.　　 In recent years, space-based and space-based aircraft have been networked through high-speed links, and given the aircraft an intelligent information processing capability, the formation of an aerospace information network is the future development trend of space networking. Due to its many advantages, the aerospace information network has very broad application prospects in military, civilian and scientific research fields. Aerospace Information Network is developed and evolved from the concept of space-based integrated information network. In addition to satellites and space vehicles of various altitudes, the nodes in the aerospace information network also include space-based adjacent space platforms, manned or unmanned aerial vehicles, etc. In addition to the interconnection and communication of various types of network nodes, the aerospace information network can also provide on-orbit information acquisition, on-orbit information processing, on-orbit information distribution, and on-orbit information applications. The accurate definition of aerospace information network is the interconnection and intercommunication of multiple space-based and space-based aircraft, based on the transmission and exchange of space information, and the processing and application of space information as the core, to support future full-space military and Large-scale space network information infrastructure for the purpose of civilian missions. Through the gateway and other facilities, the aerospace information network can be interconnected with the terrestrial network. In order to provide large-capacity information throughput and high-speed information processing capabilities, point-to-point communication links with ultra-high-speed bit transmission capabilities must be deployed between the backbone nodes of the aerospace information network.　　 Ultra-high-speed microwave communication has limited room for speed improvement due to frequency and well-known technical difficulties. Communication technology using microwave as the carrier can no longer meet the development of aerospace information network in the future. With the breakthrough of satellite laser communication key technology and the advantages of laser, it is facing the increasing demand for high data rate and large communication capacity. , Aerospace Information Network will use more space laser communication systems to achieve interconnection between backbone network nodes. The research on the key technology of space laser communication system is in full swing at home and abroad. This article introduces the architecture of high-speed space laser communication system and the main problems it faces when it is applied to aerospace information network. Based on the analysis of the backbone node link requirements of the aerospace information network, how to apply the ultra-high-speed space laser communication system in the aerospace information network is discussed, and the communication model of the space-time information network using the ultra-high-speed space laser communication system is given. (The above is edited and compiled by the metal laser cutting machine from the Internet, see www.gnlaser.com for details)