Community Facility Support for GNSS Data Analysis with GAMIT/GLOBK

该地球科学部仪器和设施项目奖支持麻省理工学院全球导航卫星系统（GNSS） GAMIT/全球卡尔曼滤波（GLOBK）套件程序、shell脚本和文档的持续开发和维护，这些程序、shell脚本和文档将继续在全球范围内用于分析GNSS数据，用于地球科学中广泛问题的科学研究。支持为用户提供专家帮助，帮助他们了解自己的数据集和分析问题，并继续开发套件，以适应新的分析模型、新一代卫星和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，是开源和免费分发的。它提供了对使用替代软件包（NASA/ jpl GIPSY-OASIS，商业伯尔尼软件包）生成的解决方案的重要独立检查，并提供了对GNSS位置解决方案可重复性的检查。调查人员还将计划和开展定期的短期技术课程，在美国国内和国际上学习这些软件包的理论和使用，以支持学生培训。GAMIT/GLOBK在全球范围内被科学家和学生用于确定GPS/GNSS天线位置、大气信号传播延迟、地球方向参数和GNSS观测数据中的卫星轨道参数。当GLOBK与其他大地测量数据（如卫星激光测距（SLR）和甚长基线干涉测量（VLBI））结合使用时，可用于生成衍生的GNSS产品，如站速、同震偏移量和地震后运动。该软件包有成千上万的用户使用它来研究地壳变形过程，包括地震、火山活动、大气水汽层析成像、电离层动力学、冰冻圈动力学，甚至确定土壤湿度和积雪深度，后者依赖于GNSS信噪比观测，记录GNSS天线附近微波地面反射的影响。该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知识价值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.