BeiDou satellites cross-regional communication path assignment model and resource management

Abstract

Time division inter-satellite communication and ranging link assignment of BeiDou satellites have made important progress; however, there is still the unsolved issue of integrated communication between ground gateway, aircraft, or even ship, and the BeiDou satellites. Therefore, in this study, we develop a path assignment model based on the idea of clustering and Markov chain. The optimal path is determined by the objective function based on the maximum transition probability. The transition probability takes into account the communication environment, congestion status, aircraft mobility, and reduces the complexity of path assignment by hiding the topology in the region. At the same time, due to the limited resources of onboard computing, storage and bandwidth, we also design a resource management strategy based on task urgency, aimed at minimizing the unreasonable allocation index, to enable the readjustment of link application resources. Finally, the performance of the model and the strategy in average link handover times, link reliability, resource allocation fairness, and network quality of service is determined by simulation.

Research on image transmission technology in engineering site without public network based on BDS-3 short message channel

“…At this point, the ground control center transmits the signals to the visible near-earth satellites through the C-band, and then the visible near-earth satellites directly send the signals through the inter-satellite link to the users. The visible near-earth satellites send the user's location to the users through the S-band [6]. The maximum length of a single transmitted message in the above communication method can reach 14,000 bits (about 1,000 Chinese characters), and the transmission frequency is relatively high, up to once per second.…”

“…The controller module is the core part of the entire system, which can control and operate various modules in the system. The power module is mainly the power source for the entire system, providing stable current for various modules in the system [6].…”