The performance of an optical time domain reflectometer(OTDR) is significantly improved using spread spectrum technology. The concept of spread spectrum OTDR(SSOTDR) is proposed, the theoretical basis and simulation r...The performance of an optical time domain reflectometer(OTDR) is significantly improved using spread spectrum technology. The concept of spread spectrum OTDR(SSOTDR) is proposed, the theoretical basis and simulation results of the new method are given, and the problem of direct application of bipolar spread spectrum codes to OTDR and despreading in the optical domain are solved. The simulation results show the feasibility of the SSOTDR, which exhibits better dynamic range reported to date for a practical long-haul OTDR system without using conventional average technique.展开更多
为提高农村电网智能化管理水平,解决传统通信技术在复杂地形下传输距离短、抗干扰弱等问题,设计一种基于远距离无线电(Long Range Radio,LoRa)扩频调制技术的电力负荷监测系统。系统包含数据采集层、无线通信层和数据管理层的3层架构,...为提高农村电网智能化管理水平,解决传统通信技术在复杂地形下传输距离短、抗干扰弱等问题,设计一种基于远距离无线电(Long Range Radio,LoRa)扩频调制技术的电力负荷监测系统。系统包含数据采集层、无线通信层和数据管理层的3层架构,并引入动态扩频因子调整、多网关协同覆盖及断电应急通信等关键技术,明显增加了负荷数据采集条数,提升了电网的供电可靠性和运维效率。展开更多
基金supported by the National Natural Science Foundation of China (No.61735011)the Science and Technology Research Project of Hebei University (No.QN2017141)the Key Research and Development Program of Hebei Province (No.19251703D)。
文摘The performance of an optical time domain reflectometer(OTDR) is significantly improved using spread spectrum technology. The concept of spread spectrum OTDR(SSOTDR) is proposed, the theoretical basis and simulation results of the new method are given, and the problem of direct application of bipolar spread spectrum codes to OTDR and despreading in the optical domain are solved. The simulation results show the feasibility of the SSOTDR, which exhibits better dynamic range reported to date for a practical long-haul OTDR system without using conventional average technique.
文摘为提高农村电网智能化管理水平,解决传统通信技术在复杂地形下传输距离短、抗干扰弱等问题,设计一种基于远距离无线电(Long Range Radio,LoRa)扩频调制技术的电力负荷监测系统。系统包含数据采集层、无线通信层和数据管理层的3层架构,并引入动态扩频因子调整、多网关协同覆盖及断电应急通信等关键技术,明显增加了负荷数据采集条数,提升了电网的供电可靠性和运维效率。
