Ka频段“动中通”地球站操作技术要求分析

doi:10.11959/j.issn.2096-8930.2021005

Abstract

Abstract:

Current technical and operational requirements for FSS GSO ESIM in Ka-band was in-depth researched.Referring to Radio Regulations and ITU recommendations, a model for theoretical calculation was established and restraining logic between each requirement and theory of depressing interference to adjacent satellites was analyzed.Then working conditions of NGSO ESIM in Ka-band was analyzed using the similar methods and the diff erences between GSO ESIM and NGSO ESIM and the infl uences on requirements of NGSO ESIM was illustrated.The results of this article provided some references for setting technical and operational requirements of NGSO ESIM.

Key words: Ka-band satellite system, earth stations in motion, FSS, GSO, NGSO

CLC Number:

TN972

Ruiqing WEN, Jin JIN, Zhen HUANG. Analysis of Technical and Operational Requirements for Earth Stations in Motion in Ka-band[J]. Space-Integrated-Ground Information Networks, 2021, 2(1): 35-45.

Figures/Tables 18

References 14

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[3]	张晓燕, 杨夏青, 武秀广 . Ka频段“动中通”地球站频率使用技术规范研究[J]. 中国无线电, 2018(10): 29-33.
	ZHANG X Y , YANG X Q , WU X G . Research on requirements of frequency using for earth stations in motion in Ka-band[J]. China Radio, 2018(10): 29-33.
[4]	工业和信息化部. 工业和信息化部关于规范对地静止轨道卫星固定业务Ka频段设置使用“动中通”地球站相关事宜的通知[J]. 中国无线电, 2019(7): 8-9.
	Ministry of Industry and Information Technology. Notifications about requirements for installing GSO FSS earth stations in motion in Ka-band by Ministry of Industry and Information Technology[J]. China Radio, 2019(7): 8-9.
[5]	International Telecommunication Union. Radio regulations(edition 2016)[M]. Geneva: ITU, 2016.
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角θ ^注2	每40 kHz的最大EIRP
2°≤θ≤7°	(19–25 logθ ) dB(W/40 kHz)
7°＜θ≤9.2°	–2 dB(W/40 kHz)
9.2°＜θ≤48°	(22–25logθ) dB(W/40 kHz)
48°＜θ≤180°	–10 dB(W/40 kHz)
注 1：这些限值是在晴空条件下得到的，同时声明了如果网络采用了上行链路功率控制，那么这些值应该包括上行链路功率控制产生的余量；同时该限值针对同一40 kHz频段内仅一个相关频率的“动中通”系统，若同一频率还存在其他同步发射的并采用码分多址的FSS GSO系统，那么需要在这个限值的基础上减小10log(N) dB，N为同频同步发射的相关卫星接受波束内“动中通”地球站的数量。
注2：表1和表2中的θ指和地球站天线焦点与目标卫星连线所成的夹角，中国和美国离轴角采用该定义。

国家	单位	偏轴角θ或ψ^注1	EIRP密度限值
国家	单位	偏轴角θ或ψ^注1	同极化	交叉极化
中国	dB(W/40 kHz)	2°≤θ≤7°	19-25 logθ	9-25 logθ
		7°＜θ≤9.2°	-2	-12
		9.2°＜θ≤48°	22-25 logθ	-
		48°＜θ≤180°	-10	-
美国（GSO弧切线方向）	dB(W/MHz)	2°≤θ≤7°	32.5-25 logθ	22.5-25 logθ
		7°＜θ≤9.2°	11.5	-
		9.2°＜θ≤19.1°	35.5-25 logθ	-
		19.1°＜θ≤180°	3.5	-
美国（GSO弧正交方向）	dB(W/MHz)	2°≤θ≤7°	35.5-25 logθ	22.5-25 logθ
		7°＜θ≤9.2°	14.4	-
		9.2°＜θ≤19.1°	38.5-25 logθ	-
		19.1°＜θ≤180°	6.5	-
欧洲	dB(W/40 kHz)	2°≤ψ≤7° 1	9-25 logψ-K^注2	9-25 logψ-K
		7°＜ψ≤9.2°	-2-K	-12-K
		9.2°＜ψ≤48°	22-25 logψ-K	-
		48°＜ψ≤180°	-10-K	-
注1：ψ指与天线主轴所成的夹角，欧洲地区离轴角采用该定义。
注2：K值的界定与表1中的注1原理类似：
(1)任何时间仅有一个“动中通”地球站在给定载波频率上传输时，K=0；
(2)多个“动中通”地球站在给定载波频率上以相同EIRP传输时， K=10log(N)，N为同时传输的“动中通”地球站数目；
(3)多个“动中通”地球站在给定载波频率上以不同EIRP传输时， K=10log(EIRP_Agg/EIRP_term)，其中EIRP_Agg为集总EIRP值，由申请人声明，EIRP_term为指定频段工作的“动中通”地球站轴上EIRP。

假设对象	假设值
两系统极化方式	同极化工作
受扰卫星视轴与干扰地球站夹角θ	0°（地球站A与地球站B重合）
干扰地球站视轴到被干扰卫星夹角ψ	2°
两地球站到受扰卫星的仰角	20°
受扰卫星接收端天线效率η	70%
受扰卫星接收端等效噪声温度T	800 K
受扰卫星接收端品质因数G/T	12.4 dB/K
收发端馈线和晴天大气损耗L_t,r,atmos	5 dB
接收端干扰噪声比(I/N)_th	–12.2 dB
载波频率	29.5～30 GHz
参考带宽B	40 kHz

指向GSO的仰角ε	EIRP频谱密度的增加/dB
ε≤5°	2.5
5°<ε≤30°	3-0.1ε

Analysis of Technical and Operational Requirements for Earth Stations in Motion in Ka-band

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