Community Facility Support for GNSS Data Analysis with GAMIT/GLOBK

这项地球科学仪器和设施计划奖支持继续开发和维护全球导航卫星系统(麻省理工学院的GNSS)GAMIT/全球卡尔曼滤波(GLOBK)程序、外壳脚本和文件，这些程序、外壳脚本和文件继续在全球范围内用于分析GNSS数据，用于对地球科学中广泛问题的科学研究。支助部门向用户提供专家协助，帮助他们了解自己的数据集和分析问题，并继续开发该套软件，以适应新的分析模型、新一代卫星以及更新的产品和数据格式。GAMIT/GLOBK是唯一的学术开发的GNSS软件套件，并且是开放源代码和免费分发的。它对使用替代包(NASA/JPLS GIPSY-OASIS，商业Bernese包)产生的解决方案进行了重要的独立检查，并对全球导航卫星系统位置解决方案的可重复性进行了检查。调查人员还将在美国和国际范围内计划并定期举办有关一揽子计划的理论和使用的技术短期课程，以支持学生培训。GAMIT/GLOBK在全世界范围内被科学家和学生用来根据GNSS观测数据确定GPS/GNSS天线位置、大气信号传播延迟、地球定向参数和卫星轨道参数。GLOBK与卫星激光测距(SLR)和甚长基线干涉测量(VLBI)等其他大地测量数据结合使用时，可用于生成诸如台站速度、同震偏移和震后运动等全球导航卫星系统衍生产品。该软件包有数以千计的用户使用它来研究地壳形变过程，包括地震、火山活动、大气水蒸气断层扫描、电离层动力学、冰冻圈动力学，甚至确定土壤水分和积雪深度，后者依赖于全球导航卫星系统信噪比观测，记录了全球导航卫星系统天线附近微波地面反射的影响。这一奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This Division of Earth Sciences Instrumentation and Facilities Program award supports the continued development and maintenance of the Global Navigation Satellites System (GNSS At MIT) GAMIT/Global Kalman Filter (GLOBK) suite of programs, shell scripts, and documentation that continue to be used worldwide for the analysis of GNSS data for scientific studies of a wide range of problems in Earth sciences. Support provides expert assistance to users in understanding their own data sets and analysis issues, and to continue the development of the suite to accommodate new analysis models, new generations of satellites and updated product and data formats. GAMIT/GLOBK is the sole academic developed GNSS software suite and is open source and freely distributed. It provides an important independent check on solutions produced using alternative packages (NASA/JPLs GIPSY-OASIS, the commercial Bernese package) and provides a check on reproducibility of GNSS position solutions. The investigators will also plan and conduct periodic technical short courses on the theory and use of the packages, both within the US and internationally, supporting student training. GAMIT/GLOBK is used worldwide by scientists and students to determine GPS/GNSS antenna positions, atmospheric signal propagation delay, earth orientation parameters, and satellite orbital parameters from GNSS observables. GLOBK, when used in conjunction with other geodetic data such as satellite laser ranging (SLR) and very long baseline interferometry (VLBI) is used to generate derived GNSS products such as station velocities, co-seismic offsets and post seismic motions. The software packages have thousands of users who employ it for research on crustal deformation processes, including earthquakes, volcanic activity, atmospheric water vapor tomography, ionospheric dynamics, cryosphere dynamics and even to determine soil moisture and snow pack depth, the latter relying on GNSS signal/noise ratio observations that record the effects of microwave ground reflections proximal to the GNSS antenna.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.