Y2002-63347-2016 0312468应用静区直线性化的PPM cDMA和扩散信道硬限幅器的PPM CDMA的室内红外无线系统的性能分析=Performance analysis of indoor infrared wirless systemsusing PPM CDMA with linearliaer with dead-zone andPPM C...Y2002-63347-2016 0312468应用静区直线性化的PPM cDMA和扩散信道硬限幅器的PPM CDMA的室内红外无线系统的性能分析=Performance analysis of indoor infrared wirless systemsusing PPM CDMA with linearliaer with dead-zone andPPM CDMA with hard-limiter on diffuse channels[会,英]/Matsuo,R.＆ Ohtsuki,T.//2001 IEEE interna-tional conference on communications Vol.7 of 10.—2016～2020(HE)展开更多
Y2002-63423-341 0315179位置认识群信息业务=Position aware group informa-tion services[会,英]/Lenaghan,A.& Schiefer,A.∥IEEE Region 8 EUROCON’2001-International Confer-ence on Trends in Communications,Proceedings V...Y2002-63423-341 0315179位置认识群信息业务=Position aware group informa-tion services[会,英]/Lenaghan,A.& Schiefer,A.∥IEEE Region 8 EUROCON’2001-International Confer-ence on Trends in Communications,Proceedings Vol.2/2.—341～344(HE)展开更多
In recent years, locating total lightning at the VLF/LF band has become one of the most important directions in lightning detection. The Low-frequency E-field Detection Array(LFEDA) consisting of nine fast antennas wa...In recent years, locating total lightning at the VLF/LF band has become one of the most important directions in lightning detection. The Low-frequency E-field Detection Array(LFEDA) consisting of nine fast antennas was developed by the Chinese Academy of Meteorological Sciences in Guangzhou between 2014 and 2015. This paper documents the composition of the LFEDA and a lightning-locating algorithm that applies to the low-frequency electric field radiated by lightning pulse discharge events(LPDEs). Theoretical simulation and objective assessment of the accuracy and detection efficiency of LFEDA have been done using Monte Carlo simulation and artificial triggered lightning experiment, respectively. The former results show that having a station in the network with a comparatively long baseline improves both the horizontal location accuracy in the direction perpendicular to the baseline and the vertical location accuracy along the baseline. The latter results show that detection efficiencies for triggered lightning flashes and return strokes are 100% and 95%, respectively. The average planar location error for return strokes of triggered lightning flashes is 102 m. By locating LPDEs in thunderstorms, we find that LPDEs are consistent with convective regions as indicated by strong reflectivity columns, and present a reasonable distribution in the vertical direction.In addition, the LFEDA can reveal an image of lightning development through mapping the channels of lightning. Based on three-dimensional locations, the vertical propagation speed of the preliminary breakdown and the changing trend of the leader's speed in an intra-cloud and a cloud-to-ground flash are investigated. The research results show that the LFEDA has the capability for three-dimensional location of lightning, which provides a new technique for researching lightning development characteristics and thunderstorm electricity.展开更多
文摘Y2002-63347-2016 0312468应用静区直线性化的PPM cDMA和扩散信道硬限幅器的PPM CDMA的室内红外无线系统的性能分析=Performance analysis of indoor infrared wirless systemsusing PPM CDMA with linearliaer with dead-zone andPPM CDMA with hard-limiter on diffuse channels[会,英]/Matsuo,R.＆ Ohtsuki,T.//2001 IEEE interna-tional conference on communications Vol.7 of 10.—2016～2020(HE)
文摘Y2002-63423-341 0315179位置认识群信息业务=Position aware group informa-tion services[会,英]/Lenaghan,A.& Schiefer,A.∥IEEE Region 8 EUROCON’2001-International Confer-ence on Trends in Communications,Proceedings Vol.2/2.—341～344(HE)
基金supported by the National Natural Science Foundation of China(Grant Nos.41675005,91537290&41275008)the Basic Research Fund of Chinese Academy of Meteorological Sciences(Grant Nos.2016Z002&2015Z006)
文摘In recent years, locating total lightning at the VLF/LF band has become one of the most important directions in lightning detection. The Low-frequency E-field Detection Array(LFEDA) consisting of nine fast antennas was developed by the Chinese Academy of Meteorological Sciences in Guangzhou between 2014 and 2015. This paper documents the composition of the LFEDA and a lightning-locating algorithm that applies to the low-frequency electric field radiated by lightning pulse discharge events(LPDEs). Theoretical simulation and objective assessment of the accuracy and detection efficiency of LFEDA have been done using Monte Carlo simulation and artificial triggered lightning experiment, respectively. The former results show that having a station in the network with a comparatively long baseline improves both the horizontal location accuracy in the direction perpendicular to the baseline and the vertical location accuracy along the baseline. The latter results show that detection efficiencies for triggered lightning flashes and return strokes are 100% and 95%, respectively. The average planar location error for return strokes of triggered lightning flashes is 102 m. By locating LPDEs in thunderstorms, we find that LPDEs are consistent with convective regions as indicated by strong reflectivity columns, and present a reasonable distribution in the vertical direction.In addition, the LFEDA can reveal an image of lightning development through mapping the channels of lightning. Based on three-dimensional locations, the vertical propagation speed of the preliminary breakdown and the changing trend of the leader's speed in an intra-cloud and a cloud-to-ground flash are investigated. The research results show that the LFEDA has the capability for three-dimensional location of lightning, which provides a new technique for researching lightning development characteristics and thunderstorm electricity.
