Volume 40, Number 1, February 2022
|Page(s)||148 - 157|
|Published online||02 May 2022|
Analytical design and performance analysis of LEO mega chain satellite constellation
Innovation Academy for Microsatellites of CAS, Shanghai 201203, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Shanghai Engineering Center for Microsatellites, Shanghai 201203, China
With the development of microsatellite technology and the growth of ground reconnaissance demand, the rapid design of a LEO constellation with minimum satellite number, low revisit time (within 10 minutes), and permanent inter-satellite links has become a hotspot and difficulty in constellation design. Aiming at the problem to use the minimum satellite number to achieve low revisit time coverage, a LEO (low earth orbit) Walker-chain constellation and its design method is proposed. The difference between the chain constellation and the classical Walker constellation is that it has one or more closed chain configurations. According to the coverage requirements and sensor field of view angle, the analytical design method is derived. A LEO chain constellation containing 132 satellites is designed for the ground reconnaissance mission. Comparing with the classical Walker-δ constellation and repeat ground track constellation, the chain constellation has fewer satellites, lower revisit time and the permanent inter-satellite links.
随着微小卫星技术的发展和对地侦察需求的增长, 快速设计一个最小卫星数量、低重访时间(10 min内)、具备永久性星间链路的低轨星座成为当前星座设计的热点和难点。针对最小卫星数量实现低重访时间覆盖的问题, 提出一种低轨Walker-链形星座及其设计方法, 与常规Walker星座的区别为具有一条或多条封闭链状构型, 依据覆盖需求和传感器视场角推导了解析设计方法。以对地侦察任务为例设计了一个包含132颗卫星的低轨链形星座, 并与常规Walker-δ星座、共地面轨迹星座对比分析效能, 验证了其数量优势、低重访时间和永久星间链路特性。
Key words: chain constellation / constellation design / low revisit time / inter-satellite links
关键字 : 链形星座 / 星座设计 / 低重访时间 / 星间链路
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