GPS P(Y)码功率增强监测分析

李文玄; 焦文海; 王凯; 邱瑞瑾; 孙淑贤

doi:10.13700/j.bh.1001-5965.2021.0676

GPS P(Y)码功率增强监测分析

doi: 10.13700/j.bh.1001-5965.2021.0676

李文玄^{1, 2, 3},
焦文海^3, ,,
王凯³,
邱瑞瑾¹,
孙淑贤²

1.
信息工程大学地理空间信息学院, 郑州 450001
2.
32021部队, 北京 100094
3.
北京跟踪与通信技术研究所, 北京 100094

详细信息

通讯作者:
焦文海, E-mail: jiaowh0927@163.com

中图分类号: P228;V249.3;TN967.1
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-08
- 录用日期: 2022-02-13
- 网络出版日期: 2022-03-10
- 整期出版日期: 2022-11-20

Monitoring and analysis on GPS P(Y) code power enhancement

LI Wenxuan^{1, 2, 3},
JIAO Wenhai^{3
, ,},
WANG Kai³,
QIU Ruijin¹,
SUN Shuxian²

1.
Institute of Geospatial Information, Information Engineering University, Zhengzhou 450001, China
2.
32021 Troops, Beijing 100094, China
3.
Beijing Institute of Tracking and Telecommunication Technology, Beijing 100094, China

More Information

Corresponding author: JIAO Wenhai, E-mail: jiaowh0927@163.com

摘要

摘要:
全球定位系统(GPS)的Block IIR-M和Block IIF卫星具备可编程功率输出能力, 可以灵活增强单个信号分量的发射功率。为了系统评估GPS P(Y)码的功率增强能力, 对弹性功率的原理进行了理论分析, 提出了GPS信号功率增强的监测分析方法, 利用国际GNSS监测评估系统(iGMAS)和国际GNSS服务(IGS)监测站数据、高增益天线监测数据、事后精密星历对GPS增强P(Y)码的覆盖性及星座性能、空间信号和用户端性能进行了分析。结果表明：在保持发射总功率和民用信号功率不变的情况下, Block IIF和Block IIR-M卫星的L1 P(Y)码和L2 P(Y)码功率相比正常水平分别增强约6 dB和5 dB；在功率增强信号覆盖区内仅利用19颗增强卫星进行双频单点定位, 位置误差不大于15 m(95%)；当可见增强卫星数为6, 增强后的P(Y)码载噪比为55 dB·Hz时, P(Y)码之间的多址干扰引起的等效载噪比下降量为0.4 dB。
- 全球定位系统 /
- 弹性功率 /
- 位置精度因子 /
- 载噪比 /
- 相干自适应副载波调制
Abstract:
With programmable power output capabilities, global positioning system(GPS) Block IIR-M and Block IIF satellites can flexibly enhance transmit power of individual signal components. In order to systematically evaluate the power enhancement capability of GPS P(Y) codes, the theoretical analysis of the flex power principle was conducted, and a monitoring and analysis method of GPS signal power enhancement was proposed. Furthermore, the coverage, constellation performance, signal-in-space and user-side performance of power-enhanced P(Y) codes were analyzed based on the data of the International GNSS monitoring and assessment system (iGMAS) and international GNSS service (IGS) monitoring station, high-gain antenna monitoring data, and precision ephemeris. According to the findings, it is possible to increase the L1 P(Y) code and L2 P(Y) code power of Block IIF and Block IIR-M satellites by about 6 dB and 5 dB, respectively, compared with the normal level, while keeping the total transmit power and civil signal power unchanged. With respect to the dual-frequency single-point positioning test only using 19 enhanced satellites, the positioning accuracy is no more than 15 m (95%) in the power-enhanced signal coverage area. While the equivalent carrier-to-noise ratio reduction caused by multi-access interference between P(Y) codes is 0.4 dB, when there are 6 visible enhanced satellites and the enhanced P(Y) code carrier-to-noise ratio is 55 dB·Hz.
- global positioning system /
- flex power /
- position dilution of precision /
- carrier-to-noise ratio /
- coherent adaptive subcarrier modulation

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图 1 几种半无码技术的平方损耗

Figure 1. Square loss of several semi-codeless techniques

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图 2 功率增强星座覆盖区域范围和可见增强卫星数

Figure 2. Coverage area range and NSAT of power enhancement constellation

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图 3 功率增强星座全球可见增强卫星数

Figure 3. Global NSAT of power enhancement constellation

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图 4 增强星座区域位置精度因子

Figure 4. PDOP of enhanced constellation area

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图 5 增强星座全球位置精度因子

Figure 5. Global PDOP of enhanced constellation

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图 6 Block IIR-M G17卫星各信号分量强度(IGS ABPO站)

Figure 6. Strength of each signal component of Block IIR-M G17 satellite (IGS ABPO)

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图 7 Block IIF G24卫星各信号分量强度(IGS MCIL站)

Figure 7. Strength of each signal component of Block IIF G24 satellite (IGS MCIL)

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图 8 Block IIR-M G17卫星各信号分量强度的变化

Figure 8. Variation of strength of each signal component of Block IIR-M G17 satellite

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图 9 Block IIF G24卫星各信号分量强度的变化

Figure 9. Variation of strength of each signal component of Block IIF G24 satellite

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图 10 P(Y)码的等效载噪比

Figure 10. Equivalent carrier-to-noise ratio of P(Y) code

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图 11 增强P(Y)码引起的C/A码载噪比下降量

Figure 11. Degradation of C/A code carrier-to-noise ratio caused by enhanced P(Y) code

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图 12 各站点定位误差(95%)

Figure 12. Positioning error of each station(95%)

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表 1 2020年2月17日弹性功率开启和终止时刻(GPST)

Table 1. Flex power on and off moments on Feb.17th, 2020 (GPST)

卫星编号	卫星类型	开始时刻	结束时刻	开始时刻	结束时刻	开始时刻	结束时刻
G01	Block IIF	00:00	05:41	09:23	13:22	23:22	00:00
G03	Block IIF	00:16	07:53	13:09	14:45
G05	Block IIR-M	06:59	11:44	14:44	20:48
G06	Block IIF	03:56	08:08	11:44	17:54
G07	Block IIR-M	04:13	12:47
G08	Block IIF	00:00	02:55	06:04	11:09	21:20	00:00
G09	Block IIF	02:36	10:47
G10	Block IIF	00:00	03:32	19:07	23:56
G12	Block IIR-M	11:41	19:34
G15	Block IIR-M	09:36	15:17	17:57	23:17
G17	Block IIR-M	01:54	04:43	09:17	16:35
G24	Block IIF	00:00	1:10	11:10	17:30	21:04	00:00
G25	Block IIF	01:07	03:56	13:33	20:31
G26	Block IIF	02:15	07:33	17:46	23:07
G27	Block IIF	00:00	02:02	05:32	09:51	19:55	00:00
G29	Block IIR-M	14:18	22:37
G30	Block IIF	05:31	13:59
G31	Block IIR-M	00:01	06:13	16:02	20:16
G32	Block IIF	00:00	04:39	14:08	16:25	21:14	00:00

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表 2 不同高度截止角下的全球可见增强卫星数

Table 2. Global NSAT at different elevation mask angle

高度截止角/(°)	NSAT
	最小	3
5	最大	10
	平均	6.4
	最小	2
15	最大	9
	平均	5
	最小	0
30	最大	7
	平均	3.1

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表 3 PDOP≤6星座可用性

Table 3. PDOP≤6 constellation availability

高度截止角/(°)	星座可用性/%
5	98.6
15	81.4
30	14.8

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表 4 Block IIR-M G17和Block IIF G24卫星各信号分量功率变化量

Table 4. Power variation of each signal component of Block IIR-M G17 and Block IIF G24 satellite

PRN	信号分量功率变化量/dB
PRN	L2 P(Y)	L1 C/A	L2 C
Block IIR-M G17	5.1	-2.4	-0.4
Block IIF G24	5.4	0.4	-0.1

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表 5 Block IIF卫星L1频点信号调制方式和功率比变化

Table 5. Variation of signal modulation mode and power ratio at L1 frequency band of Block IIF satellites

PRN	调整前调制方式	调整后调制方式	调整前P_P(Y): P_C/A/dB	调整后P_P: P_C/A/dB	ΔP_P: P_C/A/dB
G03	CASM	QPSK	-2.99	3.54	6.53
G09	QPSK	QPSK	-3.05	3.66	6.71
G24	QPSK	QPSK	-3.02	3.46	6.48
G25	CASM	QPSK	-2.74	3.94	6.68
G26	QPSK	QPSK	-3.09	3.42	6.51
G27	CASM	QPSK	-2.88	3.81	6.69
G30	QPSK	QPSK	-3.07	3.48	6.55
G32	CASM	QPSK	-3.31	3.63	6.94
平均值			-3.02	3.62	6.64

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