非静止卫星轨道星座系统固定波束到地功率通量密度研究

doi:10.11959/j.issn.2096-8930.2022012

Abstract

Abstract:

The power fl ux-density is an interference criterion for protecting terrestrial service systems from non-geostationary orbit (NGSO) constellation systems.Based on the defi nition of power fl ux density(PFD), a calculation method on the PFD produced by the emissions from the fi xed beam of NGSO constellation system was given.On the basis of describing the PFD constraint conditions of the NGSO fi xed-satellite service system given by ITU, a method for determining the limits of PFD from the NGSO constellation system was presented.Taking the Starlink system as the typical scenario, the PFD produced by telemetry, tracking, and control (TT＆amp;C) beam of the Starlink system was analyzed.The results showed that the analytical results of the given method were consistent with those of the Starlink system, and the PFD of TT＆amp;C beam in the 18.55-18.6 GHz frequency band exceeded the limit given in radio regulations.Under the current ITU framework, the number of the satellite constellation is a decisive factor for the legal use of the Ka band by NGSO constellation system.

Key words: NGSO, power fl ux-density, constellation system, fi xed beam, co-frequency interference

CLC Number:

TP927.2

Ying HUANG, Chen JIAN, Wei LI, Kang YAN. Research on the Power Flux-Density at the Earth’s Surface Produced by Emissions from the Fixed Beam of NGSO Constellation System[J]. Space-Integrated-Ground Information Networks, 2022, 3(1): 87-93.

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References 12

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波束	类型	频率范围/MHz	波束类型	极化方式	最大增益/dBi	最大EIRP谱密度/(dBW·Hz^-1)	最大EIRP/dBW	服务区域
TX11	测控	12 150～12 250	固定	RHCP	3	-89.2	-12.2	全球
TX12	测控	18 550～18 600	固定	RHCP	5	-86.1	-9.1	全球

	参数		PFD来源	水平面上到达角最大PFD（dBW·(m^-2·参考带宽^-1)）
波束	频率范围/MHz	参考带宽	PFD来源	0～5	5～10	10～15	15～20	20～25	25～90
		4 kHz	SpaceX核定值^[10]	-191.1	-189.4	-187.8	-186.4	-185.2	-179
		4 kHz	计算值	-191.0	-189.4	-187.8	-186.4	-185.2	-179.0
TX11	12 150～12 250	1 MHz	计算值	-167.1	-165.4	-163.8	-162.4	-161.2	-155.0
		1 MHz	限值	-124	-121.5	-119	-116.5	-114	-114
		1 MHz	余量	43.1	43.9	44.8	45.9	47.2	41
		1 MHz	SpaceX核定值^[10]	-164.0	-162.3	-160.7	-159.3	-158.1	-151.9
TX12	18 550～18 600	1 MHz	计算值	-164.0	-162.3	-160.7	-159.3	-158.1	-151.9
		1 MHz	限值	-184.7	-164.8	-144.9	-124.9	-105	-105
		1 MHz	余量	-20.7	-2.5	15.8	34.4	53.1	46.9

Research on the Power Flux-Density at the Earth’s Surface Produced by Emissions from the Fixed Beam of NGSO Constellation System

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