NGSO星座Q/V波段星间链路干扰规避技术

张钊; 姚秀娟; 高翔; 智佳; 王静

doi:10.11728/cjss2023.02.220302023

NGSO星座Q/V波段星间链路干扰规避技术

doi: 10.11728/cjss2023.02.220302023

张钊^{1, 2,},
姚秀娟¹,
高翔¹,
智佳¹,
王静¹

1.
中国科学院国家空间科学中心　北京　100190
2.
中国科学院大学　北京　100049

基金项目: 中国科学院空间科学战略性先导科技专项资助（XDA15060100）

详细信息

作者简介:
张钊：E-mail：zhangzhao19@mails.ucas.ac.cn

中图分类号: TN972
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- 被引次数: 0
出版历程
- 收稿日期: 2022-03-01
- 修回日期: 2022-10-26
- 网络出版日期: 2023-02-14

Interference Analysis on Q/V Band ISL between NGSO Constellation Systems

1.
National Space Science Center, Chinese Academy of Sciences, Beijing 100190
2.
University of Chinese Academy of Sciences, Beijing 100049

摘要

摘要: 随着大规模星座系统的发展，近地轨道空间频轨资源越来越紧缺。随之而来的星载通信链路干扰风险不容忽视，已成为今后星座系统设计需要重点考量的指标之一。在规避干扰的前提下，保证星座系统的工作性能至关重要。针对大规模非静止轨道（NGSO）星座系统星间链路存在的干扰风险问题，提出了基于干扰、受扰链路夹角的干扰规避方法。以Starlink的Q/V波段星间链路为例，定义了系统效率与工作效率，研究不同干扰规避方法与建链策略下系统的鲁棒性。仿真结果表明，基于受扰链路夹角的干扰规避方法能够在不同建链策略下将系统干扰噪声比I /N超限时长分别从5.79%和16.75%降至0，并且不影响工作链路。这种仿真方法对于类似具有星间链路的大规模NGSO星座系统的干扰规避具有借鉴意义。
- 星间链路 /
- Starlink /
- 干扰规避 /
- 非地球同步轨道 /
- 仿真
Abstract: With the development of large-scale constellation system, low-Earth-orbit space frequency orbit resources are increasingly scarce. The subsequent risk of space-borne communication link interference cannot be ignored, and it becomes one of the key indicators to be considered in the future constellation system design. On the premise of avoiding interference, it is crucial to ensure the working performance of constellation system. Intersatellite link has great interference risk in large scale NGSO constellation systems. To solve that, the interference avoidance methods based on the interfering and interfered angle are proposed. Taking the Starlink with Q/V band as an example, the working efficiency and anti-interference efficiency of the system are defined, and the robustness of the system under different interference avoidance methods and chain building strategies is studied. Simulation results show that the interference avoidance based on the interfered angle can reduce the I/N overrun time ratio from 5.79% and 16.75% to 0 respectively under different link building strategies, without affecting the working link. This simulation method can be a reference for large-scale NGSO constellation interference avoidance with intersatellite links.
- Inter-satellite link /
- Starlink /
- Interference avoidance /
- NGSO /
- Simulation

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图 1 同轨道面星间链路

Figure 1. Inter-satellite link within an orbit

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图 2 同轨道面天线不可见

Figure 2. Antenna invisible within an orbit

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图 3 异轨道面星间链路

Figure 3. Inter-satellite link between different orbit

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图 4 星座与链路建模

Figure 4. Constellation and link modeling

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图 5 Starlink 天线增益随离轴角的变化

Figure 5. Starlink antenna gains varies with off-axis angle

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图 6 干扰规避流程

Figure 6. Interference avoidance flow chart

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图 7 两种方法星座鲁棒性对比

Figure 7. Constellation robustness under two methods

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图 8 同轨道面天线可视角

Figure 8. Antenna angle between same orbit

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图 9 异轨道面天线可视角随半长轴的变化（粉色虚线为地球半径）

Figure 9. Antenna angle between different orbit varies with the semi-major axis (The pink dotted line is the radius of the Earth)

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图 10 θ₁时序图（粉色虚线为θ₁=3°）

Figure 10. Timing diagram of θ₁ (The pink dotted line corresponds to θ₁=3°)

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图 11 不同场景下I/N概率密度分布

Figure 11. CDF of I/N in different scenarios

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表 1 Starlink轨道输入参量

Table 1. Starlink orbit input parameters

参量	数值
轨道面	2A	5A	5B	5C
近地点/km	13892.3	1056	27354.9	31571.5
远地点/km	13892.3	1056	44221.4	40004.7
半长轴/km	13892.3	1056	35788	35788
倾角/(°)	25	54	63.4	63.4
离心率	0	0	0	0
轨道面数量	3	11	5	5
卫星数/轨	1	12	2	1

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表 2 天线空口参数

Table 2. Antenna radio parameters

参量	数值
天线类型	发射端	接收端
波束名	LIMT	LIMR
频率/GHz	50	50
带宽/MHz	900	900
主瓣增益/dBi	48	45.4
效率/(%)	60	60
峰值功率/dBw	18.5	17
噪温/K	－	627

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表 3 θ₁累计概率

Table 3. Cumulative probability of θ₁

X/（°）	概率/（%）
1	1.38
2	5.05
3	14.09
4	43.24
5	75.01
6	91.41
7	97.23
8	100

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