Abstract:The satellite constellation with automatic dependent surveillance-broadcast on-board is of great importance for air traffic surveillance due to its multiple advantages compared with traditional methods. Although some research has been conducted on satellite constellation design based on coverage performance, the findings cannot entirely satisfy all the requirements of air traffic surveillance owing to the lack of analysis on inter-satellite links and network transmission. This paper presents a novel design of … Show more
“…In the analysis of mega-constellation topologies, commonly employed methods include optimal topology planning, integer linear programming, ant colony algorithms, and random graphs [8,9]. However, these methods tend to be effective only for smaller constellations; when addressing the topology design challenges inherent in megaconstellations, they encounter significant obstacles, such as substantial computational overhead and susceptibility to becoming trapped in local optima.…”
Section: Topological Analysis Of Mega-constellationsmentioning
confidence: 99%
“…This effectively reduces the number of inter-satellite links, enhancing the system's implementability and reliability. However, it does not take into account the limitations of laser communication in inter-satellite links, such as signal attenuation issues [8].…”
In large-scale satellite constellations, the efficiency of inter-satellite communication is paramount. Traditional topology control strategies, such as the Manhattan configuration, provide stable links but can result in indirect communication paths, affecting the efficiency of information transfer. This paper addresses this issue by proposing an innovative “3 + 1” dynamic topology control scheme. The scheme retains three static links determined by the relative angular velocity and acceleration while introducing a dynamic link based on distance and angular velocity constraints to optimize the link duration and overall network communication efficiency. To address the complexity of matching dynamic links, this paper introduces an elite strategy-based maximum weighted matching algorithm for general graphs. Compared to traditional greedy algorithms, our proposed algorithm significantly improves the link duration and topological stability. Through simulation experiments comparing communication delays between Xiamen and Los Angeles, our results show that the proposed dynamic link scheme substantially reduces the average delay, enhancing the efficiency and flexibility of inter-satellite communication. This research not only extends the duration of inter-satellite links but also provides new perspectives and methodologies for further studies on inter-satellite topology control strategies.
“…In the analysis of mega-constellation topologies, commonly employed methods include optimal topology planning, integer linear programming, ant colony algorithms, and random graphs [8,9]. However, these methods tend to be effective only for smaller constellations; when addressing the topology design challenges inherent in megaconstellations, they encounter significant obstacles, such as substantial computational overhead and susceptibility to becoming trapped in local optima.…”
Section: Topological Analysis Of Mega-constellationsmentioning
confidence: 99%
“…This effectively reduces the number of inter-satellite links, enhancing the system's implementability and reliability. However, it does not take into account the limitations of laser communication in inter-satellite links, such as signal attenuation issues [8].…”
In large-scale satellite constellations, the efficiency of inter-satellite communication is paramount. Traditional topology control strategies, such as the Manhattan configuration, provide stable links but can result in indirect communication paths, affecting the efficiency of information transfer. This paper addresses this issue by proposing an innovative “3 + 1” dynamic topology control scheme. The scheme retains three static links determined by the relative angular velocity and acceleration while introducing a dynamic link based on distance and angular velocity constraints to optimize the link duration and overall network communication efficiency. To address the complexity of matching dynamic links, this paper introduces an elite strategy-based maximum weighted matching algorithm for general graphs. Compared to traditional greedy algorithms, our proposed algorithm significantly improves the link duration and topological stability. Through simulation experiments comparing communication delays between Xiamen and Los Angeles, our results show that the proposed dynamic link scheme substantially reduces the average delay, enhancing the efficiency and flexibility of inter-satellite communication. This research not only extends the duration of inter-satellite links but also provides new perspectives and methodologies for further studies on inter-satellite topology control strategies.
“…The satellite-to-ground coverage domain refers to the total area on the ground that a satellite can observe at a given moment, and its range is typically determined by the elevation angle of the ground station. According to the literature [12][13][14][15] , when the minimum elevation angle of the satellite coverage is σmin, the spherical radius of the coverage cap c r is calculated as follows: max min min (arccos(cos ) ) A is given by: 2 2…”
Section: Multi-layer Leo Mega-constellations and Inter-layer Link Cha...mentioning
“…Especially in Nanosats and CubeSats networking, multiple small satellites can be used to form a constellation, as shown in Fig. 1 , to realize the function of a large satellite 1 – 3 . For example, the characteristics of mobile communication satellite constellations in the mid-orbit zone are studied in 1 , and 10 constellation networking schemes are proposed, which can provide mobile communication services for more than 85% of people in the world.…”
Section: Introductionmentioning
confidence: 99%
“…In Ref. 3 , a low-Earth orbit satellite constellation scheme suitable for air traffic control is designed, which can realize global real-time air traffic monitoring. Figure 1 Satellite constellation diagram.…”
A multimode reflector antenna is a new concept proposed by our team in recent years, which does not correspond to the use of the traditional multimode feed but to innovation in the reflector design. This paper presents an S-band multimode reflector antenna based on multimode reflector theory. To achieve a flat-top beam shape, the main reflector of the antenna is divided into a middle region and an edge region. The height difference between them is approximately λ0/4, and then, the reflected waves in different areas partially cancel out in the direction of maximum radiation. The voltage standing wave ratio of the antenna is less than 1.5 from 2.8 to 3.4 GHz (19.4%), and the gain is more than 29.2 dB in the same frequency band. At the same time, a good flat-top beam is achieved in the range of ± 2°. The antenna can be used for satellite constellation tracking and other systems that require high-gain flat-top beams.
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