基于硅基片上光路由的大规模光载一体化接收机多天线GNSS差分定位系统  

Large-Scale Multi-Antenna and One-Receiver GNSS-over-Fiber Differential Positioning System Using Silicon On-Chip Optical Routing

作　　者：徐武 邹喜华[1] 李沛轩[1] 周林杰[2] 潘炜[1] 闫连山[1] 李阳 郑狄[1] 彭永良 Xu Wu;Zou Xihua;Li Peixuan;Zhou Linjie;Pan Wei;Yan Lianshan;Li YangZheng Di;Peng Yongliang(School of Information Science and Technology,Southwest Jiaotong University,Chengdu 611756,Sichuan,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao TongUniversity,Shanghai 200240,China)

机构地区：[1]西南交通大学信息科学与技术学院,四川成都611756 [2]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200240

出　　处：《光学学报》2022年第24期152-162,共11页Acta Optica Sinica

基　　金：国家重点研发计划(2019YFB2203204);国家自然科学基金(61922069,62001401);四川省科技计划(2022JDTD0013);四川省自然科学基金(2022NSFSC0559);中央高校基本科研业务费项目(2682021CX045)。

摘　　要：提出并实验验证了一种基于硅基片上光路由的大规模光载一体化接收机多天线全球导航卫星信号(GNSS)差分定位系统。该系统基于光载无线(RoF)分布式天线架构实现远端多点GNSS信号采集,并利用低损耗、大带宽、抗电磁干扰的RoF传输链路实现远端采集GNSS信号的本地端集中式接收。在本地端处,利用互补金属氧化物半导体(CMOS)工艺兼容的高速硅基光开关芯片实现不同监测节点光载GNSS信号的定时切换与差分解算,构建基于片上光路由的时分复用型一体化接收机多天线GNSS定位系统。在实验中,利用自主研制的1×8马赫-曾德尔干涉型热光硅基光开关芯片构建了具有5个远端监测节点的多天线GNSS定位实验系统,GNSS信号的RoF传输距离为10 km。实验结果表明,该光开关芯片模块的实时响应时间小于200μs,可在无需额外光放大的条件下稳定支撑10 km外5个远端监测节点的高精度定位,其在东(E)、北(N)、高(U)方向的定位精度均达到毫米量级。This paper proposes and experimentally validates a large-scale multi-antenna and one-receiver global navigation satellite system(GNSS)-over-fiber differential positioning system using silicon on-chip optical routing.The radio-overfiber(RoF)distributed antenna architecture is utilized to facilitate remote multipoint GNSS signal acquisition,and RoF transmission links featuring low loss,large bandwidth,and immunity to electromagnetic interference are reaped to achieve the centralized reception of remotely collected GNSS signals at the local end.At this end,a complementary metal-oxidesemiconductor(CMOS)-process-compatible high-speed silicon optical switch chip is fabricated for the periodic switching and differential calculation of GNSS signals over fiber obtained at different monitoring points.Then,a time-division multiplexing-based multi-antenna and one-receiver GNSS positioning system using on-chip optical routing is built.In the experiments,a self-developed 1×8 thermo-optic silicon optical switch chip based on a Mach-Zehnder interferometer is employed to build an experimental multi-antenna GNSS positioning system with five remote monitoring points.The RoF transmission distance of the GNSS signals is 10 km.According to the experimental results,the real-time response time of the optical switch chip module is less than 200μs.Stable and high-accuracy positioning at five remote monitoring points(10 km away)is achieved without the aid of additional optical amplification.The obtained positioning accuracy in the east(E),north(N),and up(U)directions is all at the millimeter level.

关 键 词：光电子学 微波光子学 硅基光开关芯片 全球导航卫星系统 一体化接收机多天线 高精度定位 

分 类 号：TN29[电子电信—物理电子学]