面向空天应急通信系统的空地连续覆盖技术研究与应用

doi:10.11959/j.issn.1000-0801.2022241

Abstract

Abstract:

To solve the problem of small coverage area and discontinuous coverage of large fixed-wing aerospace emergency base stations, a design scheme for continuous coverage of UAV emergency base stations was proposed.Based on the analysis of the coverage capability of the single antenna of the airborne base station, a multi-antenna coverage scheme with inner antenna plus edge antenna was proposed.Taking the roll angle, pitch angle and other parameters of the UAV flight into consideration, the installation plan of multi-antenna mounting that guarantees continuous coverage was designed.Then the link budget was carried out according to the 3GPP propagation loss model, and the UAV flight plan was planned according to the continuous coverage area requirements.Simulation and flight test results show that the proposed scheme can achieve 50 km² continuous signal coverage of the ground by the mobile base station on the UAV without using the intelligent control of the antenna angle of the PTZ.

Key words: emergency communication, continuous coverage, antenna scheme, propagation loss

CLC Number:

TN929

Shengwei CHEN, Fan LI, Guangping YANG, Jian ZHOU, Yu SU. Research and application of air-to-ground continuous coverage technology for air-space emergency communication system[J]. Telecommunications Science, 2022, 38(8): 54-64.

Figures/Tables 18

References 24

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参数	含义	单位	上行	下行
发射机	最大发射功率	W	0.2	60
	最大发射功率	dBm	23	48
	发射天线增益	dBi	0	5
	EIRP	dBm	23	53
接收机	接收机噪声系数	dB	3	7
	速率要求	kbit/s	512	2 048
	RB要求	-	8	20
	热噪声	dBm	-112.4	-108.4
	接收机底噪声	dBm	-109.4	-101.4
	SINR要求	dB	-3	1.5
	接收机灵敏度	dBm	-112.4	-99.9
增益余量损耗	接收天线增益	dBi	5	0
	干扰余量	dB	2	0
	馈线损耗	dB	0.5	0.5
	塔放增益	dB	0	0
	阴影衰落	dB	3.4	3.4
	穿透损耗	dB	0	0
	人体损耗	dB	3	3
	发射分集增益	dB	0	0
	分集接收增益	dB	0	0
	切换增益	dB	0	0
最大路径损耗	最大路径损耗	dB	131.5	145.8
最大传输距离	中心频率	GHz	0.95	0.95
	终端有效高度	m	1.5	1.5
	最大传输距离d	m	6 543.257	26 412.83

测试项	参数
无人机	翼龙II
通信卫星	中星6A
基站类型	900 MHz FDD基站
飞行方案	飞行对地高度3 500 m，对应飞行半径分别为3 000 m，正圆轨迹飞行，滚转角7°
天线方案	1副内侧天线加2副边缘天线

测试项	点位0（0 km）	点位1（2 km）	点位2（2.5 km）	点位3（3 km）	点位4（3.5 km）	点位5（4 km）
平均值	-89.15	-88.69	-93.32	-92.38	-91.05	-99.68
[-145, -120)	0(0)	0(0)	0(0)	0(0)	0(0)	0(0)
[-120, -110)	0(0)	0(0)	0(0)	1(0.25%)	0(0)	13(4.42%)
[-110, -100)	0(0)	5(1.47%)	74(23.27%)	45(11.39%)	19(5.25%)	148(50.34%)
RSRP/dBm[-100, -90)	136(40.84%)	117(34.51%)	131(41.19%)	217(54.94%)	189(52.21%)	107(36.39%)
[-90, -80)	195(58.56%)	213(62.83%)	112(35.22%)	132(33.42%)	154(42.54%)	26(8.84%)
[-80, -70)	2(0.60%)	4(1.18%)	1(0.31%)	0(0)	0(0)	0(0)
[-70, -30]	0(0)	0(0)	0(0)	0(0)	0(0)	0(0)
≥-110	100%	99.99%	99.99%	99.75%	100%	95.57%

离飞行圆心距离	VoLTE接通率（H=3 500 m）
0 km	100%
2 km	100%
2.5 km	100%
3 km	100%
3.5 km	100%
4 km	100%

	测试项	点位0（0 km）	点位1（2 km）	点位2（2.5 km）	点位3（3 km）	点位4（3.5 km）	点位5（4 km）
Ping	Ping包数	51	21	27	113	119	78
	收包数	51	21	27	113	119	77
	丢包率	0	0	0	0	0	1.28%
	平均时延/ms	568.67	541.29	504.69	542.62	586.84	704.1

Research and application of air-to-ground continuous coverage technology for air-space emergency communication system

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Figures/Tables 18

References 24

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测试项	测试结果
飞行场高/m	3 500
移动信号覆盖半径/m	4 000
移动信号覆盖面积/km²	50
VoLTE同时通话用户数/个	150～300
VoLTE语音质量	整体上语音清晰无杂音，部分点位偶有杂音，不影响通话

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