利用ZigBee技术,将各个积雪监测设备及传感器进行组合构成自组测量网络,以通用分组无线服务(GPRS,General Packet Radio Service)方式与监测中心通讯,从而构建一个基于ZigBee和GPRS的积雪数据实时监测系统。该设计将新一代无线网络通信...利用ZigBee技术,将各个积雪监测设备及传感器进行组合构成自组测量网络,以通用分组无线服务(GPRS,General Packet Radio Service)方式与监测中心通讯,从而构建一个基于ZigBee和GPRS的积雪数据实时监测系统。该设计将新一代无线网络通信技术ZigBee与GPRS移动通信相结合,应用于积雪数据监测,与传统人工监测方法相比,具有非常重大的意义和应用前景。展开更多
In optical performance monitoring system,the analog to digital converter is needed to detect the peak of nanosecond pulse and get the signal envelope.A scheme based on a designed anti-aliasing filter and analog to dig...In optical performance monitoring system,the analog to digital converter is needed to detect the peak of nanosecond pulse and get the signal envelope.A scheme based on a designed anti-aliasing filter and analog to digital converter is proposed to broaden the nanosecond pulse and make it easier for the analog to digital converter to catch the peak of the nanosecond pulse.The experimental results demonstrate that,with the proposed scheme,the optical performance system needs less time to get the recovered eye-diagram of high speed optical data signal,and is robust to phase mismatch in the analog to digital converter circuit.展开更多
文摘利用ZigBee技术,将各个积雪监测设备及传感器进行组合构成自组测量网络,以通用分组无线服务(GPRS,General Packet Radio Service)方式与监测中心通讯,从而构建一个基于ZigBee和GPRS的积雪数据实时监测系统。该设计将新一代无线网络通信技术ZigBee与GPRS移动通信相结合,应用于积雪数据监测,与传统人工监测方法相比,具有非常重大的意义和应用前景。
基金supported by National 863 Program of China(2013AA013401),P.R.ChinaNational Natural Science Foundation of China under Grant No.61177067,No.61027007,and No.61331010
文摘In optical performance monitoring system,the analog to digital converter is needed to detect the peak of nanosecond pulse and get the signal envelope.A scheme based on a designed anti-aliasing filter and analog to digital converter is proposed to broaden the nanosecond pulse and make it easier for the analog to digital converter to catch the peak of the nanosecond pulse.The experimental results demonstrate that,with the proposed scheme,the optical performance system needs less time to get the recovered eye-diagram of high speed optical data signal,and is robust to phase mismatch in the analog to digital converter circuit.
