Elements and Experiments of Shenzhen Continuous Operating Reference Stations (SZCORS) System

Real-time kinematic GPS precise positioning has been playing an increasing role in both surveying and navigation. Based on the city’s fibre LAN network, Shenzhen Continuous Operating Reference Stations (SZCORS) system has been established and consists of GPS reference stations, system control center, user’s data center, and real-time datacom network. The SZCORS system provides users the real-time centimeter positioning or post-processing millimeter positioning. This paper makes discussion on the structure of SZCORS system. Some experiments have been made to test the usablity, and then the data has been analyzed.

Quasi-real time inversion method of three-dimensional epicenter coordinate, trigger time, and magnitude based on CORS

This study explores the quasi-real time inversion principle and precision estimation of three-dimensional coordinates of the epicenter, trigger time and magnitude of earthquakes with the aim to improve traditional methods, which are flawed due to missing information or distortion in the seismograph records. The epicenter, trigger time and magnitude from the Lushan earthquake are inverted and analyzed based on high-frequency GNSS data. The inversion results achieved a high precision, which are consistent with the data published by the China Earthquake Administration. Moreover, it has been proven that the inversion method has good theoretical value and excellent application prospects.

Leveraging ROTI map derived from Indonesian GNSS receiver network for advancing study of Equatorial Plasma Bubble in Southeast/East Asia

This paper highlights the crucial role of Indonesia’s GNSS receiver network in advancing Equatorial Plasma Bubble(EPB)studies in Southeast and East Asia,as ionospheric irregularities within EPB can disrupt GNSS signals and degrade positioning accuracy.Managed by the Indonesian Geospatial Information Agency(BIG),the Indonesia Continuously Operating Reference Station(Ina-CORS)network comprises over 300 GNSS receivers spanning equatorial to southern low-latitude regions.Ina-CORS is uniquely situated to monitor EPB generation,zonal drift,and dissipation across Southeast Asia.We provide a practical tool for EPB research,by sharing two-dimensional rate of Total Electron Content(TEC)change index(ROTI)derived from this network.We generate ROTI maps with a 10-minute resolution,and samples from May 2024 are publicly available for further scientific research.Two preliminary findings from the ROTI maps of Ina-CORS are noteworthy.First,the Ina-CORS ROTI maps reveal that the irregularities within a broader EPB structure persist longer,increasing the potential for these irregularities to migrate farther eastward.Second,we demonstrate that combined ROTI maps from Ina-CORS and GNSS receivers in East Asia and Australia can be used to monitor the development of ionospheric irregularities in Southeast and East Asia.We have demonstrated the combined ROTI maps to capture the development of ionospheric irregularities in the Southeast/East Asian sector during the G5 Geomagnetic Storm on May 11,2024.We observed simultaneous ionospheric irregularities in Japan and Australia,respectively propagating northwestward and southwestward,before midnight,whereas Southeast Asia’s equatorial and low-latitude regions exhibited irregularities post-midnight.By sharing ROTI maps from Indonesia and integrating them with regional GNSS networks,researchers can conduct comprehensive EPB studies,enhancing the understanding of EPB behavior across Southeast and East Asia and contributing significantly to ionospheric research.

台风期间GNSS-PWV与降雨量的相关性探究——以上海市为例

基于上海市连续运行基准站(continuously operating reference station,CORS)系统中10个基准站2021-09-10—2021-09-14的观测数据,采用实时精密单点定位(precise point positioning,PPP)技术反演大气可降水量(precipitable water vapor,PWV),探究了台风“灿都”期间PWV与实际降雨量的时空交互特征。结果表明,PWV含量与降雨量显著相关,即PWV在降雨发生前激增,降雨期间保持稳定,降雨完成后回落至原水平。此外,PWV的空间演变还可揭示台风影响期间的水汽输送路径。上述特征证明,实时PWV有预警极端降雨的潜力,未来可在CORS系统部署降雨预警模块,进一步拓宽其服务领域。

WSL下基于GAMIT的高精度GPS/BDS基线解算及精度分析

在Windows下的Linux子系统(Windows subsystem for Linux,WSL)下,利用GAMIT 10.70对珠海市北斗连续运行基准站(Zhuhai BeiDou continuously operating reference station,ZHBDCORS)系统的观测数据进行高精度全球定位系统/北斗卫星导航系统(global positioning system/BeiDou navigation satellite system,GPS/BDS)基线解算,从归一化均方根(normalized root mean square,NRMS)值、基线较差、基线重复性等方面对解算成果进行对比分析。结果表明:GPS/BDS基线解NRMS值均在0.2左右,且BDS略优于GPS;GPS/BDS基线较差在各个基线分量上均在合理范围内,基线的长度加权平均值较差满足B级网重复基线长度较差限差要求,证明GPS/BDS的GAMIT基线解算结果具有较强的一致性;GPS在各个基线分量上的基线重复性均优于BDS,垂直方向上GPS优势更大,但BDS仍满足高精度全球导航卫星系统(global navigation satellite system,GNSS)数据处理要求。

手持农田面积测量终端研制

设计开发了一种支持多种GPS定位方式的手持嵌入式一体化农田作业面积测量终端,并针对地块面积、地块形状、GPS定位方式3个影响农田面积测量精度的因素进行了实验。结果表明:面积测量精度随地块面积增大而提高;不同形状的地块中,方形地块的面积测量精度最高,不规则地块面积测量精度的次之,条形地块的面积测量精度最差;当被测地块面积大于等于5 000 m^(2)时,任何GPS定位方式测量误差均小于3%,当被测地块在2 500 m^(2)左右时,GPS差分方式下的测量误差小于5%,可以满足实际应用要求。

ZHBDCORS Multi-GNSS数据质量分析

在北斗导航卫星系统(BeiDou navigation satellite system,BDS)迈进全球服务之际,对珠海市北斗连续运行基准站(Zhuhai BeiDou continuously operating reference station,ZHBDCORS)系统2014年以来积累的全球导航卫星系统(global navigation satellite system,GNSS)连续观测数据进行质量检核,分析其质量变化原因,评估系统的BDS支持度。结果表明,ZHBDCORS站点接收机及解算软件均不可跟踪BDS-3信号,且未完全跟踪BDS-3卫星播发的BDS-2信号;部分基准站受观测环境影响,数据完整性差,多路径误差明显,应考虑迁站升级;同等观测条件下,BDS呈现更强的抗遮挡能力。