低轨星座系统的可控波束到地功率通量密度研究

doi:10.11959/j.issn.1000-0801.2022073

Abstract

Abstract:

The power flux-density (PFD) is an interference criterion for protecting terrestrial service systems from space service systems.A calculation method on the PFD produced by the emissions from the steerable beam of low earth orbit (LEO) constellation system was given, and thus a compliance determination algorithm of the limits of PFD under specific steering angle was presented.On this basis, a compliance determination algorithm of the limits of PFD based on elevation traversal was proposed.Combined with the characteristics of LEO constellation system, the conditions to simplify the calculation of maximum PFD of steerable beam were demonstrated.Taking the Starlink system as the typical scenario, the PFD produced by the gateway beam was analyzed, and the correctness of the proposed method was verified by comparison with the results published by SpaceX.The results showed that the PFD of the gateway beam of the Starlink system in Ka frequency band atelevations below 20° exceeded the limits given in Radio Regulations.

Key words: LEO constellation system, power flux-density, frequency resource, steerable beam, co-frequency interference

CLC Number:

TN927.2

Ying HUANG, Wei LI, Chen JIAN, Kang YAN. Research on power flux-density at the earth’s surface produced by emissions from the steerable beam of LEO constellation system[J]. Telecommunications Science, 2022, 38(4): 49-58.

Figures/Tables 13

References 19

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轨道高度/km	倾角	信关站馈电波束最低通信仰角
轨道高度/km	倾角	Ka频段	E频段
328.3	30°	25°	25°
334.4	40°	25°	25°
345.6	53°	25°	25°
360	96.9°	5/25°	5/25°
373.2	75°	5/25°	5/25°
498.8	53°	25°	25°
604	148°	25°	25°
614	115.7°	25°	25°

地球站通信仰角θ	卫星下行波束半视角φ	通信距离/km
5°	70.56°	1 687
10°	68.78°	1 331
15°	66.11°	1 078
20°	62.81°	898
25°	59.08°	767
90°	0	360

参数			不同水平面上到达角EIRP谱密度/dB(W/(m²·参考带宽))
频率范围	参考带宽	数据来源	90°	25°	20°	15°	10°	5°
17.8～18.6 GHz 18.8～19.3 GHz	1 Hz	文献[13]	-51.2	-44.6	—	—	—	-48.3
71～75 GHz	1 MHz	图9	16	23	24	26	28	30

参数			PFD来源	不同水平面上到达角最大PFD/dB(W/(m²·参考带宽))
波束	频率范围	参考带宽	PFD来源	0～5	5～10	10～15	15～20	20～25	25～90
			SpaceX核定值^[14]	-123.8	-113.3	-113.3	-113.3	-113.3	-113.3
Ka频段	17.8～18.6 GHz	1 MHz	计算值	-123.8	-113.3	—	—	—	-113.3
	18.8～19.3 GHz		限值	-555.6	-443.0	-330.3	-217.7	-105	-105
			余量	-431.8	-329.7	-217	-104.4	8.3	8.3
		1 MHz	SpaceX核定值^[14]	-106.0	-106.0	-106.0	-106.0	-106.0	-106.0
E频段	71～75 GHz	1 MHz	计算值	-106.1	-105.6	-106.1	-105.6	-105.5	-105.5
		1 MHz	限值	无	无	无	无	无	无

Research on power flux-density at the earth’s surface produced by emissions from the steerable beam of LEO constellation system

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