GDJ人卫目视观测数据采集和处理系统的研制

本文介绍了ＧＤＪ跟踪打印经纬仪在人造卫星的观测中如何应用计算机对多圈卫星的目视观测资料进行实时采集、处理等工作过程的原理和方法。     

SESAM锁模激光器在卫星激光测距领域应用研究

本文在分析SESAM(Semiconductor Saturable Absorber Mirrors)锁模激光器原理及技术特点、描述其工作流程的基础上,展示了SESAM锁模激光器用于卫星激光测距的实测结果,通过对卫星激光测距数据数量及质量分析,得出了SESAM锁模激光器以窄脉冲宽度、高能量密度、输出稳定等优势首次在国内应用于卫星激光测距系统后,使系统整体性能得到明显提升的结论。     

HY2D星载北斗数据质量评估及事后精密定轨精度分析

基于海洋二号D卫星(HY2D) 2021年7月7--16日(年积日Day Of Year (DOY) 188--197)的星载北斗观测数据, 从测量数据有效性、可见卫星数量、位置精度因子及伪距多路径效应等角度分析了数据质量, 并利用其进行事后精密定轨, 从相位残差、重叠弧段、轨道互比和激光检核4种手段评估了定轨结果精度. 结论如下: (1) HY2D卫星接收北斗三号卫星数在4颗及以上占比约为86.66%; B1C频点多路径误差RMS (Root mean square)约为0.37m, B2a频点约为0.18m. (2)载波相位拟合残差RMS在6--8mm之间; 相邻轨道重叠4h的位置差异小于2cm, 与法国CNES (Centre National d`Etudes Spatiales) DORIS (Doppler Orbitography and Radio-positioning Integrated by Satellite)轨道比较径向RMS优于1.9cm. (3)用激光测距数据检核轨道精度, 其星距残差的RMS约为3.24cm. 结果表明, 国产星载双频北斗接收机可以完成海洋测高卫星的精密定轨指标.     

基于CPLD的高精度门控电路的设计

距离门控制电路是卫星激光测距(SLR)系统的一个重要组成部分,高精度距离门控制可有效提高卫星测距探测成功概率。介绍了一种基于CPLD(复杂可编程逻辑器件)的高精度门控电路的设计。在该设计中,采用硬件描述语言VHDL对CPLD进行编程,使其与单片机、PC机协调工作,从而实现高精度的距离门控制电路。     

利用高分辨率卫星影像进行地震损失评价所需的城市特征识别

高分辨率卫星影像已经在一些国家的民用领域得到应用。利用高分辨率卫星影像来收集地震损失评价所需要的各类城市信息不仅高效和有较好的时间分辨率,而且它可以减少以往所必需的大量的代价高昂且费力的城市调查。基于在印度城市台拉登所做的研究,讨论了如何利用高分辨率卫星影像进行城市特征识别的一些问题,同时也简单论述了利用GIS／RS软件综合所得的数据以便用于地震损失评价的方法。     

Structural features in the mid-southern section of the Kyushu–Palau Ridge based on satellite altimetry gravity anomaly

The Kyushu–Palau Ridge(KPR), an anti-S-shaped submarine highland at the center of the Philippine Sea Plate(PSP), is considered the residual arc of the Izu–Bonin–Mariana Island Arc, which retains key information about the cessation of the Western Philippine Basin(WPB) expansion and the Parece Vela Basin(PVB) breakup. Herein,using the new generation of satellite altimetry gravity data, high-precision seafloor topography data, and newly acquired ship-borne gravity data, the topographic and gravity characteristics of the KPR mid-southern section and adjacent region are depicted. The distribution characteristics of the faults were delineated using the normalized vertical derivative–total horizontal derivative method(NVDR-THDR) and the minimum curvature potential field separation method. The Moho depth and crustal thickness were inverted using the rapid inversion method for a double-interface model with depth constraints. Based on these results, the crust structure features in the KPR mid-southern section, and the “triangular” structure geological significance where the KPR and Central Basin Rift(CBR) of the WPB intersect are interpreted. The KPR crustal thickness is approximately 6–16 km, with a distinct discontinuity that is slightly thicker than the normal oceanic crust. The KPR mid-southern section crust structure was divided into four segments(S1–S4) from north to south, formed by the CBR eastward extension joint action and clockwise rotation of the PVB expansion axis and the Mindanao fault zone blocking effect.     

HBCORS省内区域分中心建设研究

加快区域分中心的建设,是确保湖北省连续运行卫星定位服务系统（简称HBCORS）稳定高效运行的重要因素。从湖北省实际情况出发,客观分析了湖北省现有参考站实际情况及面临的困难后,制定了一系列的区域分中心建设原则,并在此原则上,对省内区域分中心进行了有序布设,对各区域分中心在系统维护方面的主要职责进行了详细划分。     

Tectonic relation between northeastern China and the Korean peninsula revealed by interpretation of GRACE satellite gravity data

The major continental blocks in northeastern Asia are the North China block and the South China block, which have collided starting from the Korean peninsula. Geologic and geophysical interpretations reveal a well defined suture zone in northeastern China from Qinling through Dabie to Jiaodong. The discovery of high-pressure metamorphic rocks in the Hongseong area of the Korean peninsula, prominent evidence for the collision zone, indicates extension of the collision zone in northeastern China into the Korean peninsula. Interpretation of the GRACE satellite gravity dataset shows two prominent structural boundaries in the Yellow Sea. One extends from the Jiaodong Belt in eastern China to the Imjingang Belt in the Korean peninsula. The other extends from near Nanjing, eastern China, to Hongseong. Tectonic movement in or near the suture zone may be responsible for seismic activity in the western Korean peninsula and the development of the Yellow Sea sedimentary basin.