光载一机多天线远程GNSS差分监测系统

刘璞宇; 邹喜华; 李阳; 闫连山; 潘炜

doi:10.12000/JR19015

光载一机多天线远程GNSS差分监测系统

DOI: 10.12000/JR19015

西南交通大学信息科学与技术学院成都 611756

基金项目: 国家863课题(2015AA016903)，国家自然科学基金(61775185)

详细信息

作者简介:
刘璞宇(1993–)，男，四川自贡人，西南交通大学信息光子与通信研究中心硕士生，研究方向为微波光子学。E-mail: liupuyu6@163.com

邹喜华(1981–)，男，湖南衡阳人，西南交通大学信息科学与技术学院暨国家级国际科技合作基地教授，博士生导师，研究方向为微波光子学、光通信与信号处理。E-mail: zouxihua@swjtu.edu.cn

通讯作者:
邹喜华 zouxihua@swjtu.edu.cn

中图分类号: TN29
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出版历程
- 收稿日期: 2019-01-29
- 修回日期: 2019-03-15
- 网络出版日期: 2019-04-01

Multi-antenna Remote Differential Monitoring System Based on a Single GNSS-over-fiber Architecture

School of Information Science & Technology, Southwest Jiaotong University, Chengdu 611756, China

Funds: The National High-tech R&D Program of China (863 Program) (2015AA016903), The National Natural Science Foundation of China (61775185)

More Information

Corresponding author: ZOU Xihua, zouxihua@swjtu.edu.cn

摘要

摘要: 该文设计了一种光载一机多天线远程全球导航卫星系统(GNSS)差分监测系统。该系统利用微波光子链路远程采集多个远端天线接收的GNSS信号，并传输回本地端；然后在本地端借助高速光开关，以时分模式依次建立各远端信号与参考基准信号的载波相位双差模型方程，处理后实时获得高定位精度。实验中布设了10 km微波光子链路，3个远程监测点在E, N, U方向定位精度都达到毫米量级、实时响应时间低于10 ms。与传统一机单天线方案相比，该光载一机多天线GNSS差分监测系统在不降低定位精度的前提下，显著提升了监测/覆盖范围、实时监测/响应时间，以及大规模监测的性价比。因此，该系统在大型土建工程、自然环境大规模监测具有重要应用价值。
- GNSS高精度定位 /
- 一机多天线 /
- 微波光子链路 /
- 双差差分 /
- 大规模监测
Abstract: In this study, we designed and demonstrated the performance of a multi-antenna remote differential monitoring system based on a single GNSS-over-fiber architecture. In this system, multiple GNSS signals are received by remote antennas through a microwave photonic link and are then transmitted to local end points. To enable fine positioning, we established a double differential model equation for use between the carrier phase of each remotely received signal and the reference GNSS signal, with the help of the time division mode using a high-speed optical switch. In our experiment, we established a 10 km microwave photonic link among three remote monitoring points. We estimate the resulting positioning accuracy to be within several millimeters and we obtained a response time of less than 10 ms. Compared with traditional single-antenna schemes, our designed system has significant advantages with respect to coverage area, real-time response time, and the performance cost of large-scale monitoring at no cost to the positioning accuracy. As such, this system will find important applications for the monitoring of large-scale civil engineering and natural environments.
- GNSS high accuracy positioning /
- Multi-antenna /
- Microwave photonic link /
- Double differential /
- Large-scale monitoring

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图 1 双差差分示意图

Figure 1. Illustration of double difference

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图 2 光载一机多天线GNSS监测系统架构

Figure 2. Block diagram of the designed multi-antenna GNSS-over-fiber system

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图 3 光载一机多天线监测实验

Figure 3. Experiment for the designed multi-antenna system

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图 4 监测点1的基线长度和CNR

Figure 4. Baseline length and CNR obtained from the monitoring point 1

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图 5 监测点2的基线长度和CNR

Figure 5. Baseline length and CNR obtained from monitoring point 2

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图 6 监测点3的基线长度和CNR

Figure 6. Baseline length and CNR obtained from the monitoring point 3

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图 7 一机多天线下测量的基线长度和CNR (10 min间隔)

Figure 7. Baseline length result and SNR of multi-antenna (Interval of 10 min)

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图 8 一机多天线下测量的基线长度和CNR (5 min间隔)

Figure 8. Baseline lengths and CNR measured by the multi-antenna over fiber system (Interval of 5 min)

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表 1 监测点1, 2, 3的E, N, U方向的平均值和标准差(Ⅰ：一机单天线GNSS系统. Ⅱ：光载一机多天线GNSS系统)

Table 1. Mean values and standard deviations in E, N and U directions of monitoring point 1, 2, 3 (Ⅰ: One-antenna GNSS system. Ⅱ: Multi-antenna GNSS system)

监测点		E方向		N方向		U方向		基线长度
监测点		Ⅰ	Ⅱ	Ⅰ	Ⅱ	Ⅰ	Ⅱ	Ⅰ	Ⅱ
1	均值(m)	42.181	42.181	14.134	14.134	–0.003	–0.006	44.487	44.487
1	标准差(mm)	1.3	1.6	1.7	2.4	3.9	2.5	1.3	1.3
2	均值(m)	58.271	58.272	10.961	10.962	0.006	0.008	59.294	59.294
2	标准差(mm)	1.4	1.2	1.7	2.1	3.7	3.5	1.3	1.2
3	均值(m)	27.808	27.809	0.283	0.283	0.042	0.043	27.810	27.810
3	标准差(mm)	1.6	1.8	2.4	2.2	3.7	2.5	1.6	1.8

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